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middot middot ---- middot _ _ middot middot middotAUGUST 1960 middotmiddot middot_
- middot
-middot_middotmiddot
middot_middotmiddotmiddot
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WiillllWLU YIIIEJL]J) middot middot
middotmiddot middot
middot middot _ _
arzd WILLIAA4J LLOYD
middotmiddotmiddot middot RESEARCH PAPER 36
middot
-- middotmiddot
middot middot- middot GEORGE R STAEBLER--
bull
PACIFIC NORTHWEST FOREST AND RANGE EXPERIMENT STATION
US DEPt OF AGRICULTURE FOREST SERVICEbull
middot
middot r
)InitiaJ in followi g
__ -
middotmiddot middotmiddot
middotmiddot middotr middot middot middot _middot-middot middotmiddot middotmiddot )middot _
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impetus developingth e red aider yield tables was _provided by the members of the Olytllpia Research Center Adshy middoth middotvisoryConimittee William J middotLloydmiddot Lau ence 0 Barrett Royce 0 Co]nelius GilbertE Liming and LmiddotT Webster Site derivation and
preliminary phases of yield table construction were largely the work of middot middotmiddot Daniel M Bishop who was closely associated with the project in its middot early stages The lengthy task of machine computation and subsequent
analysis was chfefly the work ofDorothy middotMartinmiddot Basicmiddot plot data with- out which the prqject would not have be n possible middotwe e contdbuted by middot repres n-tatives of both private industry and public agercies In addition
middotmiddot
to the ExperiIllent Stations Corvallis and Olympia Research Centers these representatives were
middotgtBloedel Timberla d
middotmiddot gt middot
middotBritish Columbia Forest Se vice Crown Zellerbach Corp bullbullbull bull middot middot middot
middotmiddotmiddotmiddot Fibreboard Products Inc middotbull middotGifford Pinchot Natio l Forest
middot Kaiser Gypsum Co Longview Fibre Co bull Milwaukee Land Co Mount Baker National Forest
Northern Jacific Railway Co Olympic National Forest Pope amp Talbot Inc Puget Sound Pulp amp Timber Co middot Rayonier Inc St Paul amp Tacoma Lumber Co middotSt Regis Paper Co
middot Scott Paper Co middot middot middot Seattle Water Departrilent
middot middot Simpsqn Logging Co middot bull Snoqualmie National Forest
US Bureau of Land Management US Soil Conservation Service Washington State Department of Natural Resources Western Washington Indian Agency West Tacoma Newsprint Co Weyerhaeuser Co Willapa Valley Water District
-
Research Paper 36
middotmiddot -
NORMAL YIELD TABLES FOR RED ALDER
by
Norman P Worthington and Floyd A Johnson Pacific Northwest Forest and Range Experiment Station
George R Staebler Weyerhaeuser Company
William J Lloyd Soil Conservation Service
August 1960
PACIFIC NORTHWEST FOREST AND RANGE EXPERIMENT STA TION
R W Cowlin Director Portland Oregon
FOREST SERVICE US DEPARTMEN TOF AGRICULTURE
I
I I l
I
bull bull middot middotmiddotmiddot -middot-- bullbull - middot middot- - - ______ _ __ __ lt1 -middot
CON TEN TS
INTRODUC TION 1
BASIC DA TA 1
ANALYSIS PROCEDURE 2
APPLICA TION 3
NUITiber
YIELD TABLES AND FI GURES
l Average total height of dominant and codominant trees lI l
Trees per acre-shylarger than 0 5 inch d b h 2 larger than 5 5 inches d b h 3 larger than 9 5 inches d b h 4
I Diameter of average tree-shyl larger than 0 5 inch d b h 5
larger than 5 5 inches d b h 6 I larger than 9 5 inches d b h 7
Basal area per acre-shytrees larger than 0 5 inch d b h 8 trees larger than 5 5 inches d b h 9 trees larger than 9 5 inches d b h 10
Cubic-foot volUITie per acre-shytrees larger than 5 5 inches d b h 1 1
trees larger than 9 5 inches d b h 12
Board-foot volUITie per acre (Scribner rule)-shy
trees larger than 9 5 inches d b h 13
IN TRODUC TION
Increasing interest in the management of red alder (Alnus rubra) has created a need for reliable yield information Existing yield tables for red alder]) have been very useful as interim sources of information but
they are generally inadequate for current and prospective management needs The aavisory tommittee bull for the Stations Olympia Research Center at the suggestion of several members sponsored a subcommittee to -proshymote the construction of new tables suitable for regionwide application Through cooperative efforts of both public and private forestry organizashytions the project was started in 1956
This research paper has been prepared to make the newly derived tables available to Northwest foresters without delay The narrative presshy
entation is accordingly brief A more complete report on the red alder yield study--including more adequate coverage of source data analytical procedures and application--is planned for future publication
BASIC DA TA
Field work for the red alder yield tables was begun in the summer of 1956 and completed in 1957 Altogether data from 428 sample plots well -stratified throughout Oorthwestern Oregon western Washington and
southern British Columbia were used in the yield table construction A goal of 60 plots within each 10-year age class from 10 through 80 years was thus reasonably well attained All plots conformed to the following specifishycations
1 Pure stand containing over 80 percent red alder by basal area
2 Closed crown canupy to give evidencemiddot of normality over the past lOyears
_ British Columbia Forest Service Yield tables 19 47 7 pp plus
tables) 19 47 (Processed ) Johnson Herman M Hanzlik Edward J and Gibbons William H
Red alder of the Papific Northwest its utilization with notes on growth and manqgement U S Dept Agr Bul 1 437 46 pp illus 1926
Lloyd W J Unpublished empirical yield tables U S Soil Cons erv Serv Seattle Wash 1943
Pope R B Empirical yield tables--Douglas-fir subregion 195 4 (Unpublished report Copy on file U S Forest Serv Pac NW Forest and Range Expt Sta Portland Oreg )
l l l
I I i I l I l l
3 Plot location restricted to a uniform part of the stand
4 Plot size of 1 I 40 acre for stands under 10 years old 1 I 10 acre for stands 10 to 20 years old and 1 I5 acre for stands over 20 years old
Data taken for each plot included
1 Diameter of all trees larger than 0 5 inch d b h by species and l -inch diameter classes
2 Stand age determi ed from breast-high increment borings of five trees in the upper canopy
3 Total height of the five trees bored for age and of an additional five trees to fill out stand diameter range
Site curves were developed from stem analyses of 43 felled and sec- tioned trees distributed throughout western Washington Th index stand age for the curve is 50 years with stand age defined as breast-high age plus 2 years This middotmethod of site indexing involving multiple regression was described by Bishop et all_
Yield data were derived for the following stand characteristics
1 Trees per acre
2 Basal area per acre
l
3 Diameter of average tree
4 Cubic feet per acre
5 Board feet per acre Scribner rule
ANALYSIS PROCEDURE
Multiple regression analyses were used to calculate the formulas that express the basic relations of stand characteristics such as basal area diameter and volume to stand age and site index Yield tables and figures were then derived from the formulas Dependent variables in the regression analyses were basal area average diameter cubic volume and board-footshycubic-foot ratio (from which board-foot yields were calculated) Independent
I 3_1Bishop Da iel M Johnson Floyd A and Staebler George R
I Site curves for red alder US Forest Serv Pac NW Forest and Range Expt Sta Res Note l 62 7pp illus 1958 (Processeci)
I -2shy
I
-3-
variables included first second and third powers of stand age first and second powers of site index and the product of stand age and site index The most effective combinations of the independent variables were used in develshyoping the final yield formulas which are shown in footnotes to appropriate yield tables
For three stand attributes--basal area average diameter and cubic volume--separate analyses were made for the following three stand segments
1 All trees larger than 0 5 inch d b h
2 All trees larger than 5 5 inches d b h
3 All trees larger than 9 5 inches d b h I
Because of limited and naturally variable data the regressions for the differshyent stand segments invariably crossed This problem of crossing was arbishytrarily resolved by using the regression for the stand segment larger than 5 5 inches above the point of crossing The age at which crossing occurred called merging age was found to depend on site index This relationship is also shown in footnotes to appropriate yield tables
Yield in board feet was developed by applying the board-foot-cubicshyfoot ratios determined from multiple regression to the calculated cubic-foot yield of trees larger than 9 5 inches d b h Thus a reasonable relation of board-foot to cubic-foot yields was assured Equations used for calculating board-foot yields (footnotes table 13 were obtained by multiplying the ratio formula by the appropriate cubic-volume yield formula
APPLICA TION
In using the tables to predict yields of specific stands allowances should of course be made for inevitable differences between fully stocked conditions as represented by the tables and actual conditions as encountered in the forest The tables are based oh data from small plots selected for normal stocking and do not characterize stand conditions usually found over wide areas Lower values than those in the tables should therefore be exshypected when yield data are applied to existing stancls
In comparing red alder yields with those of associated conifers two additional factors should be recognized ( 1) red alder stands usually contain more defect than conifer stands of comparable age and (2) an 8-foot scaling length is the basis for board-foot yields of red alder whereas a 16-foot scaling length is used for most conifers
The merging age device used in some tables to smooth out irr)gushylarities should not affect practical application of the yield tables because the loss in accuracy is insignificant
Blocks in tables indicate extent of the basic data
l I
l I i
l l
r i f
I middotI
13oFeet--------------------------------------
-----+-----+----+--
---------------L------L----
IImiddot r Ir rI
I
FIGURE 1
Average total height of dominant and codominant trees
T O T AL HEIGHT
II0
7 0
60
50
40
20 0 10 20 30 40 50 60 70 80
AGE ( Years )
middot ------------------------- --- --- --- --------- ---- ---
70
31 39 47
44 57
25 43 65 79
30 79
35 77
45 67 77
93
75
99
79
94
TABLE 1
Average tota l height of dominant and codominant trees
Site index (feet) Age
(years) 60 80 90 100 110 120
-Feet
10 23 27 35 43
15 31 37 42 47 52 58 63
50 63 6920 38
50 58 72
87 9548 56 63 71
51 60 69 86 94 103
40 55 64 73 82 91 100 109
58 86 96 105 115
so 60 70 80 90 100 110 120
104 114 12455 62 73 83
60 64 86 96 107 118 128
110 121 13265 66 77 88
70 68 90 101 113 124 135
75 69 80 92 103 115 126 138
105 117 129 14180 70 82
Derived from the formula
Site index = (060924 + 19538age) height where site index is for stand age so
76
86
ll
l
f
1 i I
-------------------------------------------
-------------------------------------L------
i middotmiddotmiddotI
ll
middot j i
middot imiddot1
I i l
FIGURE 2
Trees per acre --larger than 05 inch dbh
NUMBER OF TRE ES
000
600
0 1 0 20 30 40 50 60 70 eo
AGE
I
15
55
75
432
144
TABLE 2
Trees per acre--larger than 05 inch dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Number -------------------------
10 4 742 3531 2613 1964 1469
1702 1410 1171 956
20 919 808 695 674 512
1 111 851
779 643 528
441 376
334 291
267 239
225 202
194 184
178 169
165 156
151
139 133
128 122
117 112
106 102
96 93
609 543 48625 378
30 445 404 368 333 300
35 345 321 296 272 248
40 282 265 247 231 212
45 239 229 218 205 190
50 209 203 196 184 172
60
173 172 169 165 159
157 157 154 150 145
141 139 137 132
70 126 124 121
65
80
112 109
98
Number of trees obtained by dividing total basal area by basal area of average tree
middot i ll
f i I bull bull I
I
FIGURE 3
Trees per acre--larger than 55 inches dbh
NUMBER OF TREES
I
10 30 40 50 60 70 80
AGE Years
------------------------
I
I
------- ------- ------ - - - --I
25
40
45
55
75
144
93
TABLE 3
Trees per acre-- larger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
Number
10 158 169 166 158
15 158 201 220 223 219 211 199
20 220 239 247 244 236 226 211
30
241 248 250 244 236 225 211
240 245 245 238 227 217 204
235 231 224 216 205 19335 232
50
219 221 217 210 201 191 181
205 205 201 194 186 178 169
188 188 185 179 172 165 156
172 169 165 159 151171
60 155 157 154 150 145 139 133
65 141 139 137 132 128 122
70 126 124 121 117 112
112 109 106 102
80 98 96
Number of trees obtained by dividing total basal area by basal area of average tree
1
FIGURE 4
Trees per acre--larger than 95 inches dbh
NUMBER OF TREES
ii
20 30 40 50 60 70 80
AGE ( Years
I
24 57
95
93
24 34 44
93
144
93
TABLE 4
Treesper acre--larger than 95 inches db h
Site index (feet) Age
(years) 60 70 80 90 100 llO 120
-- -------- -------- ------ l1umber -------------------------20 12
25 15 30 44 56 67 76
30 41 70 82 102
63 78 92 101 ll3 12135 46
40 63 80 108 118 128 135
45 77 108 119 129 138 144
50 86 103 116 127 136 144 148
55 93 108 121 131 140 143
60 96 111 123 132 138 138 133
65 96 llO 122 130 131 128 122
70 94 119 122 121 ll7 ll2
75 1ll 112 109 106 102
80 103 100 98 96
Number of trees obtained by div iding total basal area by basal area of average tree
l j
------------------------------r-----------
1----------1-------1--------+---
1--------+--------11---
----L-----------------------------L------
FIGURE 5
Diame ter of average tree-shylarger than 05 inch db h
DI AME TE R
200 Inches
I 40
120
0 10 20 30 40 50 60 70 eo
AGE Years
1
I
I
70
15
25
35
40
50
70
97
48
83
27
40
54
53 35
TABLE 5
Diameter of average tree-shylarger than 05 inch dbh
S ite index (feet)Age (years)
60 80 90 100 110 120
------------------------ Inches ------------------------shy
31 36 42
51 58
65 72
72 79 87
92 100
105 114
117 124
127 134
136 143
146 153
155 163
164 172
173 182
182 191
16 19 2310
28 32 36 46
20 40 44 59
51 55 60 66
30 61 66 72 78 85
71 77 90 97
80 86 93 100 108bull 89 96 103 11145 119
104 112 120 129
55 108
60 115
65
116 123 131 138
123 131 139 147
130 139 147 155
75
146middot 155 164
163 172
80 18 1 191 20o
------------------------ Years --------------------------55 56 56 49 43Merging age
1 Up to merging age Diameter of average tree = - 083 + 02045 (age) - 0001153 (age)2
0 000284 (site index) 2
- 0 0192 (site index) + + 0001103 (s ite index) (age)
Above merging age Diameter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 000091l (site index) (age)
Merging age = 675 + 13625 (site index) - 0009375 (site index)2
1
I jbull I
lmiddot j I L j
i middot
l
l t i i H )l
1 middot I
I 1 lc
lnches--------------r--------------------------
1----------+-------+---------t--
-------------------L------------------------
200
140
60 70 80
FIGURE 6
Diameter of average tree-shylarger than 55 inches dbh
DI AME T E R
middot bull1
1 20
100
80
60
40
20
0 10 20 30 40 50
AGE Yeo rs
I 52
15 53
79
45
55
70
75
TABLE 6
Diame ter of average tree-shylarger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Inches --- ----------------------55 58 62
69 72
74 79 83
88 93
93 98 103
108 114
117 124
127 134
136 143
146 153
163155
164 172
173 182
182 191
200191
I 10
49 57 61 65
20
25
30
35
40
so
60
65
57 61
65 69 74
72 77
8579
93 9987
94 101
101 108
108 116
123115
130
66 70
84
83 88
91 97 102
105 111
107 114 120
115 122 12 9
123 131 138
131 139 147
139 147 155
146 155 bull164
163 172
f 80 181t Diameter of average tree = 109 + 01057 (age) - 0 000198 (age)2
+ 00247 (si te index) + 0000911 (site index)(age)
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
middot
middot r
)InitiaJ in followi g
__ -
middotmiddot middotmiddot
middotmiddot middotr middot middot middot _middot-middot middotmiddot middotmiddot )middot _
middot middotmiddotmiddot
middot middotmiddotmiddot
impetus developingth e red aider yield tables was _provided by the members of the Olytllpia Research Center Adshy middoth middotvisoryConimittee William J middotLloydmiddot Lau ence 0 Barrett Royce 0 Co]nelius GilbertE Liming and LmiddotT Webster Site derivation and
preliminary phases of yield table construction were largely the work of middot middotmiddot Daniel M Bishop who was closely associated with the project in its middot early stages The lengthy task of machine computation and subsequent
analysis was chfefly the work ofDorothy middotMartinmiddot Basicmiddot plot data with- out which the prqject would not have be n possible middotwe e contdbuted by middot repres n-tatives of both private industry and public agercies In addition
middotmiddot
to the ExperiIllent Stations Corvallis and Olympia Research Centers these representatives were
middotgtBloedel Timberla d
middotmiddot gt middot
middotBritish Columbia Forest Se vice Crown Zellerbach Corp bullbullbull bull middot middot middot
middotmiddotmiddotmiddot Fibreboard Products Inc middotbull middotGifford Pinchot Natio l Forest
middot Kaiser Gypsum Co Longview Fibre Co bull Milwaukee Land Co Mount Baker National Forest
Northern Jacific Railway Co Olympic National Forest Pope amp Talbot Inc Puget Sound Pulp amp Timber Co middot Rayonier Inc St Paul amp Tacoma Lumber Co middotSt Regis Paper Co
middot Scott Paper Co middot middot middot Seattle Water Departrilent
middot middot Simpsqn Logging Co middot bull Snoqualmie National Forest
US Bureau of Land Management US Soil Conservation Service Washington State Department of Natural Resources Western Washington Indian Agency West Tacoma Newsprint Co Weyerhaeuser Co Willapa Valley Water District
-
Research Paper 36
middotmiddot -
NORMAL YIELD TABLES FOR RED ALDER
by
Norman P Worthington and Floyd A Johnson Pacific Northwest Forest and Range Experiment Station
George R Staebler Weyerhaeuser Company
William J Lloyd Soil Conservation Service
August 1960
PACIFIC NORTHWEST FOREST AND RANGE EXPERIMENT STA TION
R W Cowlin Director Portland Oregon
FOREST SERVICE US DEPARTMEN TOF AGRICULTURE
I
I I l
I
bull bull middot middotmiddotmiddot -middot-- bullbull - middot middot- - - ______ _ __ __ lt1 -middot
CON TEN TS
INTRODUC TION 1
BASIC DA TA 1
ANALYSIS PROCEDURE 2
APPLICA TION 3
NUITiber
YIELD TABLES AND FI GURES
l Average total height of dominant and codominant trees lI l
Trees per acre-shylarger than 0 5 inch d b h 2 larger than 5 5 inches d b h 3 larger than 9 5 inches d b h 4
I Diameter of average tree-shyl larger than 0 5 inch d b h 5
larger than 5 5 inches d b h 6 I larger than 9 5 inches d b h 7
Basal area per acre-shytrees larger than 0 5 inch d b h 8 trees larger than 5 5 inches d b h 9 trees larger than 9 5 inches d b h 10
Cubic-foot volUITie per acre-shytrees larger than 5 5 inches d b h 1 1
trees larger than 9 5 inches d b h 12
Board-foot volUITie per acre (Scribner rule)-shy
trees larger than 9 5 inches d b h 13
IN TRODUC TION
Increasing interest in the management of red alder (Alnus rubra) has created a need for reliable yield information Existing yield tables for red alder]) have been very useful as interim sources of information but
they are generally inadequate for current and prospective management needs The aavisory tommittee bull for the Stations Olympia Research Center at the suggestion of several members sponsored a subcommittee to -proshymote the construction of new tables suitable for regionwide application Through cooperative efforts of both public and private forestry organizashytions the project was started in 1956
This research paper has been prepared to make the newly derived tables available to Northwest foresters without delay The narrative presshy
entation is accordingly brief A more complete report on the red alder yield study--including more adequate coverage of source data analytical procedures and application--is planned for future publication
BASIC DA TA
Field work for the red alder yield tables was begun in the summer of 1956 and completed in 1957 Altogether data from 428 sample plots well -stratified throughout Oorthwestern Oregon western Washington and
southern British Columbia were used in the yield table construction A goal of 60 plots within each 10-year age class from 10 through 80 years was thus reasonably well attained All plots conformed to the following specifishycations
1 Pure stand containing over 80 percent red alder by basal area
2 Closed crown canupy to give evidencemiddot of normality over the past lOyears
_ British Columbia Forest Service Yield tables 19 47 7 pp plus
tables) 19 47 (Processed ) Johnson Herman M Hanzlik Edward J and Gibbons William H
Red alder of the Papific Northwest its utilization with notes on growth and manqgement U S Dept Agr Bul 1 437 46 pp illus 1926
Lloyd W J Unpublished empirical yield tables U S Soil Cons erv Serv Seattle Wash 1943
Pope R B Empirical yield tables--Douglas-fir subregion 195 4 (Unpublished report Copy on file U S Forest Serv Pac NW Forest and Range Expt Sta Portland Oreg )
l l l
I I i I l I l l
3 Plot location restricted to a uniform part of the stand
4 Plot size of 1 I 40 acre for stands under 10 years old 1 I 10 acre for stands 10 to 20 years old and 1 I5 acre for stands over 20 years old
Data taken for each plot included
1 Diameter of all trees larger than 0 5 inch d b h by species and l -inch diameter classes
2 Stand age determi ed from breast-high increment borings of five trees in the upper canopy
3 Total height of the five trees bored for age and of an additional five trees to fill out stand diameter range
Site curves were developed from stem analyses of 43 felled and sec- tioned trees distributed throughout western Washington Th index stand age for the curve is 50 years with stand age defined as breast-high age plus 2 years This middotmethod of site indexing involving multiple regression was described by Bishop et all_
Yield data were derived for the following stand characteristics
1 Trees per acre
2 Basal area per acre
l
3 Diameter of average tree
4 Cubic feet per acre
5 Board feet per acre Scribner rule
ANALYSIS PROCEDURE
Multiple regression analyses were used to calculate the formulas that express the basic relations of stand characteristics such as basal area diameter and volume to stand age and site index Yield tables and figures were then derived from the formulas Dependent variables in the regression analyses were basal area average diameter cubic volume and board-footshycubic-foot ratio (from which board-foot yields were calculated) Independent
I 3_1Bishop Da iel M Johnson Floyd A and Staebler George R
I Site curves for red alder US Forest Serv Pac NW Forest and Range Expt Sta Res Note l 62 7pp illus 1958 (Processeci)
I -2shy
I
-3-
variables included first second and third powers of stand age first and second powers of site index and the product of stand age and site index The most effective combinations of the independent variables were used in develshyoping the final yield formulas which are shown in footnotes to appropriate yield tables
For three stand attributes--basal area average diameter and cubic volume--separate analyses were made for the following three stand segments
1 All trees larger than 0 5 inch d b h
2 All trees larger than 5 5 inches d b h
3 All trees larger than 9 5 inches d b h I
Because of limited and naturally variable data the regressions for the differshyent stand segments invariably crossed This problem of crossing was arbishytrarily resolved by using the regression for the stand segment larger than 5 5 inches above the point of crossing The age at which crossing occurred called merging age was found to depend on site index This relationship is also shown in footnotes to appropriate yield tables
Yield in board feet was developed by applying the board-foot-cubicshyfoot ratios determined from multiple regression to the calculated cubic-foot yield of trees larger than 9 5 inches d b h Thus a reasonable relation of board-foot to cubic-foot yields was assured Equations used for calculating board-foot yields (footnotes table 13 were obtained by multiplying the ratio formula by the appropriate cubic-volume yield formula
APPLICA TION
In using the tables to predict yields of specific stands allowances should of course be made for inevitable differences between fully stocked conditions as represented by the tables and actual conditions as encountered in the forest The tables are based oh data from small plots selected for normal stocking and do not characterize stand conditions usually found over wide areas Lower values than those in the tables should therefore be exshypected when yield data are applied to existing stancls
In comparing red alder yields with those of associated conifers two additional factors should be recognized ( 1) red alder stands usually contain more defect than conifer stands of comparable age and (2) an 8-foot scaling length is the basis for board-foot yields of red alder whereas a 16-foot scaling length is used for most conifers
The merging age device used in some tables to smooth out irr)gushylarities should not affect practical application of the yield tables because the loss in accuracy is insignificant
Blocks in tables indicate extent of the basic data
l I
l I i
l l
r i f
I middotI
13oFeet--------------------------------------
-----+-----+----+--
---------------L------L----
IImiddot r Ir rI
I
FIGURE 1
Average total height of dominant and codominant trees
T O T AL HEIGHT
II0
7 0
60
50
40
20 0 10 20 30 40 50 60 70 80
AGE ( Years )
middot ------------------------- --- --- --- --------- ---- ---
70
31 39 47
44 57
25 43 65 79
30 79
35 77
45 67 77
93
75
99
79
94
TABLE 1
Average tota l height of dominant and codominant trees
Site index (feet) Age
(years) 60 80 90 100 110 120
-Feet
10 23 27 35 43
15 31 37 42 47 52 58 63
50 63 6920 38
50 58 72
87 9548 56 63 71
51 60 69 86 94 103
40 55 64 73 82 91 100 109
58 86 96 105 115
so 60 70 80 90 100 110 120
104 114 12455 62 73 83
60 64 86 96 107 118 128
110 121 13265 66 77 88
70 68 90 101 113 124 135
75 69 80 92 103 115 126 138
105 117 129 14180 70 82
Derived from the formula
Site index = (060924 + 19538age) height where site index is for stand age so
76
86
ll
l
f
1 i I
-------------------------------------------
-------------------------------------L------
i middotmiddotmiddotI
ll
middot j i
middot imiddot1
I i l
FIGURE 2
Trees per acre --larger than 05 inch dbh
NUMBER OF TRE ES
000
600
0 1 0 20 30 40 50 60 70 eo
AGE
I
15
55
75
432
144
TABLE 2
Trees per acre--larger than 05 inch dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Number -------------------------
10 4 742 3531 2613 1964 1469
1702 1410 1171 956
20 919 808 695 674 512
1 111 851
779 643 528
441 376
334 291
267 239
225 202
194 184
178 169
165 156
151
139 133
128 122
117 112
106 102
96 93
609 543 48625 378
30 445 404 368 333 300
35 345 321 296 272 248
40 282 265 247 231 212
45 239 229 218 205 190
50 209 203 196 184 172
60
173 172 169 165 159
157 157 154 150 145
141 139 137 132
70 126 124 121
65
80
112 109
98
Number of trees obtained by dividing total basal area by basal area of average tree
middot i ll
f i I bull bull I
I
FIGURE 3
Trees per acre--larger than 55 inches dbh
NUMBER OF TREES
I
10 30 40 50 60 70 80
AGE Years
------------------------
I
I
------- ------- ------ - - - --I
25
40
45
55
75
144
93
TABLE 3
Trees per acre-- larger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
Number
10 158 169 166 158
15 158 201 220 223 219 211 199
20 220 239 247 244 236 226 211
30
241 248 250 244 236 225 211
240 245 245 238 227 217 204
235 231 224 216 205 19335 232
50
219 221 217 210 201 191 181
205 205 201 194 186 178 169
188 188 185 179 172 165 156
172 169 165 159 151171
60 155 157 154 150 145 139 133
65 141 139 137 132 128 122
70 126 124 121 117 112
112 109 106 102
80 98 96
Number of trees obtained by dividing total basal area by basal area of average tree
1
FIGURE 4
Trees per acre--larger than 95 inches dbh
NUMBER OF TREES
ii
20 30 40 50 60 70 80
AGE ( Years
I
24 57
95
93
24 34 44
93
144
93
TABLE 4
Treesper acre--larger than 95 inches db h
Site index (feet) Age
(years) 60 70 80 90 100 llO 120
-- -------- -------- ------ l1umber -------------------------20 12
25 15 30 44 56 67 76
30 41 70 82 102
63 78 92 101 ll3 12135 46
40 63 80 108 118 128 135
45 77 108 119 129 138 144
50 86 103 116 127 136 144 148
55 93 108 121 131 140 143
60 96 111 123 132 138 138 133
65 96 llO 122 130 131 128 122
70 94 119 122 121 ll7 ll2
75 1ll 112 109 106 102
80 103 100 98 96
Number of trees obtained by div iding total basal area by basal area of average tree
l j
------------------------------r-----------
1----------1-------1--------+---
1--------+--------11---
----L-----------------------------L------
FIGURE 5
Diame ter of average tree-shylarger than 05 inch db h
DI AME TE R
200 Inches
I 40
120
0 10 20 30 40 50 60 70 eo
AGE Years
1
I
I
70
15
25
35
40
50
70
97
48
83
27
40
54
53 35
TABLE 5
Diameter of average tree-shylarger than 05 inch dbh
S ite index (feet)Age (years)
60 80 90 100 110 120
------------------------ Inches ------------------------shy
31 36 42
51 58
65 72
72 79 87
92 100
105 114
117 124
127 134
136 143
146 153
155 163
164 172
173 182
182 191
16 19 2310
28 32 36 46
20 40 44 59
51 55 60 66
30 61 66 72 78 85
71 77 90 97
80 86 93 100 108bull 89 96 103 11145 119
104 112 120 129
55 108
60 115
65
116 123 131 138
123 131 139 147
130 139 147 155
75
146middot 155 164
163 172
80 18 1 191 20o
------------------------ Years --------------------------55 56 56 49 43Merging age
1 Up to merging age Diameter of average tree = - 083 + 02045 (age) - 0001153 (age)2
0 000284 (site index) 2
- 0 0192 (site index) + + 0001103 (s ite index) (age)
Above merging age Diameter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 000091l (site index) (age)
Merging age = 675 + 13625 (site index) - 0009375 (site index)2
1
I jbull I
lmiddot j I L j
i middot
l
l t i i H )l
1 middot I
I 1 lc
lnches--------------r--------------------------
1----------+-------+---------t--
-------------------L------------------------
200
140
60 70 80
FIGURE 6
Diameter of average tree-shylarger than 55 inches dbh
DI AME T E R
middot bull1
1 20
100
80
60
40
20
0 10 20 30 40 50
AGE Yeo rs
I 52
15 53
79
45
55
70
75
TABLE 6
Diame ter of average tree-shylarger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Inches --- ----------------------55 58 62
69 72
74 79 83
88 93
93 98 103
108 114
117 124
127 134
136 143
146 153
163155
164 172
173 182
182 191
200191
I 10
49 57 61 65
20
25
30
35
40
so
60
65
57 61
65 69 74
72 77
8579
93 9987
94 101
101 108
108 116
123115
130
66 70
84
83 88
91 97 102
105 111
107 114 120
115 122 12 9
123 131 138
131 139 147
139 147 155
146 155 bull164
163 172
f 80 181t Diameter of average tree = 109 + 01057 (age) - 0 000198 (age)2
+ 00247 (si te index) + 0000911 (site index)(age)
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
-
Research Paper 36
middotmiddot -
NORMAL YIELD TABLES FOR RED ALDER
by
Norman P Worthington and Floyd A Johnson Pacific Northwest Forest and Range Experiment Station
George R Staebler Weyerhaeuser Company
William J Lloyd Soil Conservation Service
August 1960
PACIFIC NORTHWEST FOREST AND RANGE EXPERIMENT STA TION
R W Cowlin Director Portland Oregon
FOREST SERVICE US DEPARTMEN TOF AGRICULTURE
I
I I l
I
bull bull middot middotmiddotmiddot -middot-- bullbull - middot middot- - - ______ _ __ __ lt1 -middot
CON TEN TS
INTRODUC TION 1
BASIC DA TA 1
ANALYSIS PROCEDURE 2
APPLICA TION 3
NUITiber
YIELD TABLES AND FI GURES
l Average total height of dominant and codominant trees lI l
Trees per acre-shylarger than 0 5 inch d b h 2 larger than 5 5 inches d b h 3 larger than 9 5 inches d b h 4
I Diameter of average tree-shyl larger than 0 5 inch d b h 5
larger than 5 5 inches d b h 6 I larger than 9 5 inches d b h 7
Basal area per acre-shytrees larger than 0 5 inch d b h 8 trees larger than 5 5 inches d b h 9 trees larger than 9 5 inches d b h 10
Cubic-foot volUITie per acre-shytrees larger than 5 5 inches d b h 1 1
trees larger than 9 5 inches d b h 12
Board-foot volUITie per acre (Scribner rule)-shy
trees larger than 9 5 inches d b h 13
IN TRODUC TION
Increasing interest in the management of red alder (Alnus rubra) has created a need for reliable yield information Existing yield tables for red alder]) have been very useful as interim sources of information but
they are generally inadequate for current and prospective management needs The aavisory tommittee bull for the Stations Olympia Research Center at the suggestion of several members sponsored a subcommittee to -proshymote the construction of new tables suitable for regionwide application Through cooperative efforts of both public and private forestry organizashytions the project was started in 1956
This research paper has been prepared to make the newly derived tables available to Northwest foresters without delay The narrative presshy
entation is accordingly brief A more complete report on the red alder yield study--including more adequate coverage of source data analytical procedures and application--is planned for future publication
BASIC DA TA
Field work for the red alder yield tables was begun in the summer of 1956 and completed in 1957 Altogether data from 428 sample plots well -stratified throughout Oorthwestern Oregon western Washington and
southern British Columbia were used in the yield table construction A goal of 60 plots within each 10-year age class from 10 through 80 years was thus reasonably well attained All plots conformed to the following specifishycations
1 Pure stand containing over 80 percent red alder by basal area
2 Closed crown canupy to give evidencemiddot of normality over the past lOyears
_ British Columbia Forest Service Yield tables 19 47 7 pp plus
tables) 19 47 (Processed ) Johnson Herman M Hanzlik Edward J and Gibbons William H
Red alder of the Papific Northwest its utilization with notes on growth and manqgement U S Dept Agr Bul 1 437 46 pp illus 1926
Lloyd W J Unpublished empirical yield tables U S Soil Cons erv Serv Seattle Wash 1943
Pope R B Empirical yield tables--Douglas-fir subregion 195 4 (Unpublished report Copy on file U S Forest Serv Pac NW Forest and Range Expt Sta Portland Oreg )
l l l
I I i I l I l l
3 Plot location restricted to a uniform part of the stand
4 Plot size of 1 I 40 acre for stands under 10 years old 1 I 10 acre for stands 10 to 20 years old and 1 I5 acre for stands over 20 years old
Data taken for each plot included
1 Diameter of all trees larger than 0 5 inch d b h by species and l -inch diameter classes
2 Stand age determi ed from breast-high increment borings of five trees in the upper canopy
3 Total height of the five trees bored for age and of an additional five trees to fill out stand diameter range
Site curves were developed from stem analyses of 43 felled and sec- tioned trees distributed throughout western Washington Th index stand age for the curve is 50 years with stand age defined as breast-high age plus 2 years This middotmethod of site indexing involving multiple regression was described by Bishop et all_
Yield data were derived for the following stand characteristics
1 Trees per acre
2 Basal area per acre
l
3 Diameter of average tree
4 Cubic feet per acre
5 Board feet per acre Scribner rule
ANALYSIS PROCEDURE
Multiple regression analyses were used to calculate the formulas that express the basic relations of stand characteristics such as basal area diameter and volume to stand age and site index Yield tables and figures were then derived from the formulas Dependent variables in the regression analyses were basal area average diameter cubic volume and board-footshycubic-foot ratio (from which board-foot yields were calculated) Independent
I 3_1Bishop Da iel M Johnson Floyd A and Staebler George R
I Site curves for red alder US Forest Serv Pac NW Forest and Range Expt Sta Res Note l 62 7pp illus 1958 (Processeci)
I -2shy
I
-3-
variables included first second and third powers of stand age first and second powers of site index and the product of stand age and site index The most effective combinations of the independent variables were used in develshyoping the final yield formulas which are shown in footnotes to appropriate yield tables
For three stand attributes--basal area average diameter and cubic volume--separate analyses were made for the following three stand segments
1 All trees larger than 0 5 inch d b h
2 All trees larger than 5 5 inches d b h
3 All trees larger than 9 5 inches d b h I
Because of limited and naturally variable data the regressions for the differshyent stand segments invariably crossed This problem of crossing was arbishytrarily resolved by using the regression for the stand segment larger than 5 5 inches above the point of crossing The age at which crossing occurred called merging age was found to depend on site index This relationship is also shown in footnotes to appropriate yield tables
Yield in board feet was developed by applying the board-foot-cubicshyfoot ratios determined from multiple regression to the calculated cubic-foot yield of trees larger than 9 5 inches d b h Thus a reasonable relation of board-foot to cubic-foot yields was assured Equations used for calculating board-foot yields (footnotes table 13 were obtained by multiplying the ratio formula by the appropriate cubic-volume yield formula
APPLICA TION
In using the tables to predict yields of specific stands allowances should of course be made for inevitable differences between fully stocked conditions as represented by the tables and actual conditions as encountered in the forest The tables are based oh data from small plots selected for normal stocking and do not characterize stand conditions usually found over wide areas Lower values than those in the tables should therefore be exshypected when yield data are applied to existing stancls
In comparing red alder yields with those of associated conifers two additional factors should be recognized ( 1) red alder stands usually contain more defect than conifer stands of comparable age and (2) an 8-foot scaling length is the basis for board-foot yields of red alder whereas a 16-foot scaling length is used for most conifers
The merging age device used in some tables to smooth out irr)gushylarities should not affect practical application of the yield tables because the loss in accuracy is insignificant
Blocks in tables indicate extent of the basic data
l I
l I i
l l
r i f
I middotI
13oFeet--------------------------------------
-----+-----+----+--
---------------L------L----
IImiddot r Ir rI
I
FIGURE 1
Average total height of dominant and codominant trees
T O T AL HEIGHT
II0
7 0
60
50
40
20 0 10 20 30 40 50 60 70 80
AGE ( Years )
middot ------------------------- --- --- --- --------- ---- ---
70
31 39 47
44 57
25 43 65 79
30 79
35 77
45 67 77
93
75
99
79
94
TABLE 1
Average tota l height of dominant and codominant trees
Site index (feet) Age
(years) 60 80 90 100 110 120
-Feet
10 23 27 35 43
15 31 37 42 47 52 58 63
50 63 6920 38
50 58 72
87 9548 56 63 71
51 60 69 86 94 103
40 55 64 73 82 91 100 109
58 86 96 105 115
so 60 70 80 90 100 110 120
104 114 12455 62 73 83
60 64 86 96 107 118 128
110 121 13265 66 77 88
70 68 90 101 113 124 135
75 69 80 92 103 115 126 138
105 117 129 14180 70 82
Derived from the formula
Site index = (060924 + 19538age) height where site index is for stand age so
76
86
ll
l
f
1 i I
-------------------------------------------
-------------------------------------L------
i middotmiddotmiddotI
ll
middot j i
middot imiddot1
I i l
FIGURE 2
Trees per acre --larger than 05 inch dbh
NUMBER OF TRE ES
000
600
0 1 0 20 30 40 50 60 70 eo
AGE
I
15
55
75
432
144
TABLE 2
Trees per acre--larger than 05 inch dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Number -------------------------
10 4 742 3531 2613 1964 1469
1702 1410 1171 956
20 919 808 695 674 512
1 111 851
779 643 528
441 376
334 291
267 239
225 202
194 184
178 169
165 156
151
139 133
128 122
117 112
106 102
96 93
609 543 48625 378
30 445 404 368 333 300
35 345 321 296 272 248
40 282 265 247 231 212
45 239 229 218 205 190
50 209 203 196 184 172
60
173 172 169 165 159
157 157 154 150 145
141 139 137 132
70 126 124 121
65
80
112 109
98
Number of trees obtained by dividing total basal area by basal area of average tree
middot i ll
f i I bull bull I
I
FIGURE 3
Trees per acre--larger than 55 inches dbh
NUMBER OF TREES
I
10 30 40 50 60 70 80
AGE Years
------------------------
I
I
------- ------- ------ - - - --I
25
40
45
55
75
144
93
TABLE 3
Trees per acre-- larger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
Number
10 158 169 166 158
15 158 201 220 223 219 211 199
20 220 239 247 244 236 226 211
30
241 248 250 244 236 225 211
240 245 245 238 227 217 204
235 231 224 216 205 19335 232
50
219 221 217 210 201 191 181
205 205 201 194 186 178 169
188 188 185 179 172 165 156
172 169 165 159 151171
60 155 157 154 150 145 139 133
65 141 139 137 132 128 122
70 126 124 121 117 112
112 109 106 102
80 98 96
Number of trees obtained by dividing total basal area by basal area of average tree
1
FIGURE 4
Trees per acre--larger than 95 inches dbh
NUMBER OF TREES
ii
20 30 40 50 60 70 80
AGE ( Years
I
24 57
95
93
24 34 44
93
144
93
TABLE 4
Treesper acre--larger than 95 inches db h
Site index (feet) Age
(years) 60 70 80 90 100 llO 120
-- -------- -------- ------ l1umber -------------------------20 12
25 15 30 44 56 67 76
30 41 70 82 102
63 78 92 101 ll3 12135 46
40 63 80 108 118 128 135
45 77 108 119 129 138 144
50 86 103 116 127 136 144 148
55 93 108 121 131 140 143
60 96 111 123 132 138 138 133
65 96 llO 122 130 131 128 122
70 94 119 122 121 ll7 ll2
75 1ll 112 109 106 102
80 103 100 98 96
Number of trees obtained by div iding total basal area by basal area of average tree
l j
------------------------------r-----------
1----------1-------1--------+---
1--------+--------11---
----L-----------------------------L------
FIGURE 5
Diame ter of average tree-shylarger than 05 inch db h
DI AME TE R
200 Inches
I 40
120
0 10 20 30 40 50 60 70 eo
AGE Years
1
I
I
70
15
25
35
40
50
70
97
48
83
27
40
54
53 35
TABLE 5
Diameter of average tree-shylarger than 05 inch dbh
S ite index (feet)Age (years)
60 80 90 100 110 120
------------------------ Inches ------------------------shy
31 36 42
51 58
65 72
72 79 87
92 100
105 114
117 124
127 134
136 143
146 153
155 163
164 172
173 182
182 191
16 19 2310
28 32 36 46
20 40 44 59
51 55 60 66
30 61 66 72 78 85
71 77 90 97
80 86 93 100 108bull 89 96 103 11145 119
104 112 120 129
55 108
60 115
65
116 123 131 138
123 131 139 147
130 139 147 155
75
146middot 155 164
163 172
80 18 1 191 20o
------------------------ Years --------------------------55 56 56 49 43Merging age
1 Up to merging age Diameter of average tree = - 083 + 02045 (age) - 0001153 (age)2
0 000284 (site index) 2
- 0 0192 (site index) + + 0001103 (s ite index) (age)
Above merging age Diameter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 000091l (site index) (age)
Merging age = 675 + 13625 (site index) - 0009375 (site index)2
1
I jbull I
lmiddot j I L j
i middot
l
l t i i H )l
1 middot I
I 1 lc
lnches--------------r--------------------------
1----------+-------+---------t--
-------------------L------------------------
200
140
60 70 80
FIGURE 6
Diameter of average tree-shylarger than 55 inches dbh
DI AME T E R
middot bull1
1 20
100
80
60
40
20
0 10 20 30 40 50
AGE Yeo rs
I 52
15 53
79
45
55
70
75
TABLE 6
Diame ter of average tree-shylarger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Inches --- ----------------------55 58 62
69 72
74 79 83
88 93
93 98 103
108 114
117 124
127 134
136 143
146 153
163155
164 172
173 182
182 191
200191
I 10
49 57 61 65
20
25
30
35
40
so
60
65
57 61
65 69 74
72 77
8579
93 9987
94 101
101 108
108 116
123115
130
66 70
84
83 88
91 97 102
105 111
107 114 120
115 122 12 9
123 131 138
131 139 147
139 147 155
146 155 bull164
163 172
f 80 181t Diameter of average tree = 109 + 01057 (age) - 0 000198 (age)2
+ 00247 (si te index) + 0000911 (site index)(age)
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
I
I I l
I
bull bull middot middotmiddotmiddot -middot-- bullbull - middot middot- - - ______ _ __ __ lt1 -middot
CON TEN TS
INTRODUC TION 1
BASIC DA TA 1
ANALYSIS PROCEDURE 2
APPLICA TION 3
NUITiber
YIELD TABLES AND FI GURES
l Average total height of dominant and codominant trees lI l
Trees per acre-shylarger than 0 5 inch d b h 2 larger than 5 5 inches d b h 3 larger than 9 5 inches d b h 4
I Diameter of average tree-shyl larger than 0 5 inch d b h 5
larger than 5 5 inches d b h 6 I larger than 9 5 inches d b h 7
Basal area per acre-shytrees larger than 0 5 inch d b h 8 trees larger than 5 5 inches d b h 9 trees larger than 9 5 inches d b h 10
Cubic-foot volUITie per acre-shytrees larger than 5 5 inches d b h 1 1
trees larger than 9 5 inches d b h 12
Board-foot volUITie per acre (Scribner rule)-shy
trees larger than 9 5 inches d b h 13
IN TRODUC TION
Increasing interest in the management of red alder (Alnus rubra) has created a need for reliable yield information Existing yield tables for red alder]) have been very useful as interim sources of information but
they are generally inadequate for current and prospective management needs The aavisory tommittee bull for the Stations Olympia Research Center at the suggestion of several members sponsored a subcommittee to -proshymote the construction of new tables suitable for regionwide application Through cooperative efforts of both public and private forestry organizashytions the project was started in 1956
This research paper has been prepared to make the newly derived tables available to Northwest foresters without delay The narrative presshy
entation is accordingly brief A more complete report on the red alder yield study--including more adequate coverage of source data analytical procedures and application--is planned for future publication
BASIC DA TA
Field work for the red alder yield tables was begun in the summer of 1956 and completed in 1957 Altogether data from 428 sample plots well -stratified throughout Oorthwestern Oregon western Washington and
southern British Columbia were used in the yield table construction A goal of 60 plots within each 10-year age class from 10 through 80 years was thus reasonably well attained All plots conformed to the following specifishycations
1 Pure stand containing over 80 percent red alder by basal area
2 Closed crown canupy to give evidencemiddot of normality over the past lOyears
_ British Columbia Forest Service Yield tables 19 47 7 pp plus
tables) 19 47 (Processed ) Johnson Herman M Hanzlik Edward J and Gibbons William H
Red alder of the Papific Northwest its utilization with notes on growth and manqgement U S Dept Agr Bul 1 437 46 pp illus 1926
Lloyd W J Unpublished empirical yield tables U S Soil Cons erv Serv Seattle Wash 1943
Pope R B Empirical yield tables--Douglas-fir subregion 195 4 (Unpublished report Copy on file U S Forest Serv Pac NW Forest and Range Expt Sta Portland Oreg )
l l l
I I i I l I l l
3 Plot location restricted to a uniform part of the stand
4 Plot size of 1 I 40 acre for stands under 10 years old 1 I 10 acre for stands 10 to 20 years old and 1 I5 acre for stands over 20 years old
Data taken for each plot included
1 Diameter of all trees larger than 0 5 inch d b h by species and l -inch diameter classes
2 Stand age determi ed from breast-high increment borings of five trees in the upper canopy
3 Total height of the five trees bored for age and of an additional five trees to fill out stand diameter range
Site curves were developed from stem analyses of 43 felled and sec- tioned trees distributed throughout western Washington Th index stand age for the curve is 50 years with stand age defined as breast-high age plus 2 years This middotmethod of site indexing involving multiple regression was described by Bishop et all_
Yield data were derived for the following stand characteristics
1 Trees per acre
2 Basal area per acre
l
3 Diameter of average tree
4 Cubic feet per acre
5 Board feet per acre Scribner rule
ANALYSIS PROCEDURE
Multiple regression analyses were used to calculate the formulas that express the basic relations of stand characteristics such as basal area diameter and volume to stand age and site index Yield tables and figures were then derived from the formulas Dependent variables in the regression analyses were basal area average diameter cubic volume and board-footshycubic-foot ratio (from which board-foot yields were calculated) Independent
I 3_1Bishop Da iel M Johnson Floyd A and Staebler George R
I Site curves for red alder US Forest Serv Pac NW Forest and Range Expt Sta Res Note l 62 7pp illus 1958 (Processeci)
I -2shy
I
-3-
variables included first second and third powers of stand age first and second powers of site index and the product of stand age and site index The most effective combinations of the independent variables were used in develshyoping the final yield formulas which are shown in footnotes to appropriate yield tables
For three stand attributes--basal area average diameter and cubic volume--separate analyses were made for the following three stand segments
1 All trees larger than 0 5 inch d b h
2 All trees larger than 5 5 inches d b h
3 All trees larger than 9 5 inches d b h I
Because of limited and naturally variable data the regressions for the differshyent stand segments invariably crossed This problem of crossing was arbishytrarily resolved by using the regression for the stand segment larger than 5 5 inches above the point of crossing The age at which crossing occurred called merging age was found to depend on site index This relationship is also shown in footnotes to appropriate yield tables
Yield in board feet was developed by applying the board-foot-cubicshyfoot ratios determined from multiple regression to the calculated cubic-foot yield of trees larger than 9 5 inches d b h Thus a reasonable relation of board-foot to cubic-foot yields was assured Equations used for calculating board-foot yields (footnotes table 13 were obtained by multiplying the ratio formula by the appropriate cubic-volume yield formula
APPLICA TION
In using the tables to predict yields of specific stands allowances should of course be made for inevitable differences between fully stocked conditions as represented by the tables and actual conditions as encountered in the forest The tables are based oh data from small plots selected for normal stocking and do not characterize stand conditions usually found over wide areas Lower values than those in the tables should therefore be exshypected when yield data are applied to existing stancls
In comparing red alder yields with those of associated conifers two additional factors should be recognized ( 1) red alder stands usually contain more defect than conifer stands of comparable age and (2) an 8-foot scaling length is the basis for board-foot yields of red alder whereas a 16-foot scaling length is used for most conifers
The merging age device used in some tables to smooth out irr)gushylarities should not affect practical application of the yield tables because the loss in accuracy is insignificant
Blocks in tables indicate extent of the basic data
l I
l I i
l l
r i f
I middotI
13oFeet--------------------------------------
-----+-----+----+--
---------------L------L----
IImiddot r Ir rI
I
FIGURE 1
Average total height of dominant and codominant trees
T O T AL HEIGHT
II0
7 0
60
50
40
20 0 10 20 30 40 50 60 70 80
AGE ( Years )
middot ------------------------- --- --- --- --------- ---- ---
70
31 39 47
44 57
25 43 65 79
30 79
35 77
45 67 77
93
75
99
79
94
TABLE 1
Average tota l height of dominant and codominant trees
Site index (feet) Age
(years) 60 80 90 100 110 120
-Feet
10 23 27 35 43
15 31 37 42 47 52 58 63
50 63 6920 38
50 58 72
87 9548 56 63 71
51 60 69 86 94 103
40 55 64 73 82 91 100 109
58 86 96 105 115
so 60 70 80 90 100 110 120
104 114 12455 62 73 83
60 64 86 96 107 118 128
110 121 13265 66 77 88
70 68 90 101 113 124 135
75 69 80 92 103 115 126 138
105 117 129 14180 70 82
Derived from the formula
Site index = (060924 + 19538age) height where site index is for stand age so
76
86
ll
l
f
1 i I
-------------------------------------------
-------------------------------------L------
i middotmiddotmiddotI
ll
middot j i
middot imiddot1
I i l
FIGURE 2
Trees per acre --larger than 05 inch dbh
NUMBER OF TRE ES
000
600
0 1 0 20 30 40 50 60 70 eo
AGE
I
15
55
75
432
144
TABLE 2
Trees per acre--larger than 05 inch dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Number -------------------------
10 4 742 3531 2613 1964 1469
1702 1410 1171 956
20 919 808 695 674 512
1 111 851
779 643 528
441 376
334 291
267 239
225 202
194 184
178 169
165 156
151
139 133
128 122
117 112
106 102
96 93
609 543 48625 378
30 445 404 368 333 300
35 345 321 296 272 248
40 282 265 247 231 212
45 239 229 218 205 190
50 209 203 196 184 172
60
173 172 169 165 159
157 157 154 150 145
141 139 137 132
70 126 124 121
65
80
112 109
98
Number of trees obtained by dividing total basal area by basal area of average tree
middot i ll
f i I bull bull I
I
FIGURE 3
Trees per acre--larger than 55 inches dbh
NUMBER OF TREES
I
10 30 40 50 60 70 80
AGE Years
------------------------
I
I
------- ------- ------ - - - --I
25
40
45
55
75
144
93
TABLE 3
Trees per acre-- larger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
Number
10 158 169 166 158
15 158 201 220 223 219 211 199
20 220 239 247 244 236 226 211
30
241 248 250 244 236 225 211
240 245 245 238 227 217 204
235 231 224 216 205 19335 232
50
219 221 217 210 201 191 181
205 205 201 194 186 178 169
188 188 185 179 172 165 156
172 169 165 159 151171
60 155 157 154 150 145 139 133
65 141 139 137 132 128 122
70 126 124 121 117 112
112 109 106 102
80 98 96
Number of trees obtained by dividing total basal area by basal area of average tree
1
FIGURE 4
Trees per acre--larger than 95 inches dbh
NUMBER OF TREES
ii
20 30 40 50 60 70 80
AGE ( Years
I
24 57
95
93
24 34 44
93
144
93
TABLE 4
Treesper acre--larger than 95 inches db h
Site index (feet) Age
(years) 60 70 80 90 100 llO 120
-- -------- -------- ------ l1umber -------------------------20 12
25 15 30 44 56 67 76
30 41 70 82 102
63 78 92 101 ll3 12135 46
40 63 80 108 118 128 135
45 77 108 119 129 138 144
50 86 103 116 127 136 144 148
55 93 108 121 131 140 143
60 96 111 123 132 138 138 133
65 96 llO 122 130 131 128 122
70 94 119 122 121 ll7 ll2
75 1ll 112 109 106 102
80 103 100 98 96
Number of trees obtained by div iding total basal area by basal area of average tree
l j
------------------------------r-----------
1----------1-------1--------+---
1--------+--------11---
----L-----------------------------L------
FIGURE 5
Diame ter of average tree-shylarger than 05 inch db h
DI AME TE R
200 Inches
I 40
120
0 10 20 30 40 50 60 70 eo
AGE Years
1
I
I
70
15
25
35
40
50
70
97
48
83
27
40
54
53 35
TABLE 5
Diameter of average tree-shylarger than 05 inch dbh
S ite index (feet)Age (years)
60 80 90 100 110 120
------------------------ Inches ------------------------shy
31 36 42
51 58
65 72
72 79 87
92 100
105 114
117 124
127 134
136 143
146 153
155 163
164 172
173 182
182 191
16 19 2310
28 32 36 46
20 40 44 59
51 55 60 66
30 61 66 72 78 85
71 77 90 97
80 86 93 100 108bull 89 96 103 11145 119
104 112 120 129
55 108
60 115
65
116 123 131 138
123 131 139 147
130 139 147 155
75
146middot 155 164
163 172
80 18 1 191 20o
------------------------ Years --------------------------55 56 56 49 43Merging age
1 Up to merging age Diameter of average tree = - 083 + 02045 (age) - 0001153 (age)2
0 000284 (site index) 2
- 0 0192 (site index) + + 0001103 (s ite index) (age)
Above merging age Diameter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 000091l (site index) (age)
Merging age = 675 + 13625 (site index) - 0009375 (site index)2
1
I jbull I
lmiddot j I L j
i middot
l
l t i i H )l
1 middot I
I 1 lc
lnches--------------r--------------------------
1----------+-------+---------t--
-------------------L------------------------
200
140
60 70 80
FIGURE 6
Diameter of average tree-shylarger than 55 inches dbh
DI AME T E R
middot bull1
1 20
100
80
60
40
20
0 10 20 30 40 50
AGE Yeo rs
I 52
15 53
79
45
55
70
75
TABLE 6
Diame ter of average tree-shylarger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Inches --- ----------------------55 58 62
69 72
74 79 83
88 93
93 98 103
108 114
117 124
127 134
136 143
146 153
163155
164 172
173 182
182 191
200191
I 10
49 57 61 65
20
25
30
35
40
so
60
65
57 61
65 69 74
72 77
8579
93 9987
94 101
101 108
108 116
123115
130
66 70
84
83 88
91 97 102
105 111
107 114 120
115 122 12 9
123 131 138
131 139 147
139 147 155
146 155 bull164
163 172
f 80 181t Diameter of average tree = 109 + 01057 (age) - 0 000198 (age)2
+ 00247 (si te index) + 0000911 (site index)(age)
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
IN TRODUC TION
Increasing interest in the management of red alder (Alnus rubra) has created a need for reliable yield information Existing yield tables for red alder]) have been very useful as interim sources of information but
they are generally inadequate for current and prospective management needs The aavisory tommittee bull for the Stations Olympia Research Center at the suggestion of several members sponsored a subcommittee to -proshymote the construction of new tables suitable for regionwide application Through cooperative efforts of both public and private forestry organizashytions the project was started in 1956
This research paper has been prepared to make the newly derived tables available to Northwest foresters without delay The narrative presshy
entation is accordingly brief A more complete report on the red alder yield study--including more adequate coverage of source data analytical procedures and application--is planned for future publication
BASIC DA TA
Field work for the red alder yield tables was begun in the summer of 1956 and completed in 1957 Altogether data from 428 sample plots well -stratified throughout Oorthwestern Oregon western Washington and
southern British Columbia were used in the yield table construction A goal of 60 plots within each 10-year age class from 10 through 80 years was thus reasonably well attained All plots conformed to the following specifishycations
1 Pure stand containing over 80 percent red alder by basal area
2 Closed crown canupy to give evidencemiddot of normality over the past lOyears
_ British Columbia Forest Service Yield tables 19 47 7 pp plus
tables) 19 47 (Processed ) Johnson Herman M Hanzlik Edward J and Gibbons William H
Red alder of the Papific Northwest its utilization with notes on growth and manqgement U S Dept Agr Bul 1 437 46 pp illus 1926
Lloyd W J Unpublished empirical yield tables U S Soil Cons erv Serv Seattle Wash 1943
Pope R B Empirical yield tables--Douglas-fir subregion 195 4 (Unpublished report Copy on file U S Forest Serv Pac NW Forest and Range Expt Sta Portland Oreg )
l l l
I I i I l I l l
3 Plot location restricted to a uniform part of the stand
4 Plot size of 1 I 40 acre for stands under 10 years old 1 I 10 acre for stands 10 to 20 years old and 1 I5 acre for stands over 20 years old
Data taken for each plot included
1 Diameter of all trees larger than 0 5 inch d b h by species and l -inch diameter classes
2 Stand age determi ed from breast-high increment borings of five trees in the upper canopy
3 Total height of the five trees bored for age and of an additional five trees to fill out stand diameter range
Site curves were developed from stem analyses of 43 felled and sec- tioned trees distributed throughout western Washington Th index stand age for the curve is 50 years with stand age defined as breast-high age plus 2 years This middotmethod of site indexing involving multiple regression was described by Bishop et all_
Yield data were derived for the following stand characteristics
1 Trees per acre
2 Basal area per acre
l
3 Diameter of average tree
4 Cubic feet per acre
5 Board feet per acre Scribner rule
ANALYSIS PROCEDURE
Multiple regression analyses were used to calculate the formulas that express the basic relations of stand characteristics such as basal area diameter and volume to stand age and site index Yield tables and figures were then derived from the formulas Dependent variables in the regression analyses were basal area average diameter cubic volume and board-footshycubic-foot ratio (from which board-foot yields were calculated) Independent
I 3_1Bishop Da iel M Johnson Floyd A and Staebler George R
I Site curves for red alder US Forest Serv Pac NW Forest and Range Expt Sta Res Note l 62 7pp illus 1958 (Processeci)
I -2shy
I
-3-
variables included first second and third powers of stand age first and second powers of site index and the product of stand age and site index The most effective combinations of the independent variables were used in develshyoping the final yield formulas which are shown in footnotes to appropriate yield tables
For three stand attributes--basal area average diameter and cubic volume--separate analyses were made for the following three stand segments
1 All trees larger than 0 5 inch d b h
2 All trees larger than 5 5 inches d b h
3 All trees larger than 9 5 inches d b h I
Because of limited and naturally variable data the regressions for the differshyent stand segments invariably crossed This problem of crossing was arbishytrarily resolved by using the regression for the stand segment larger than 5 5 inches above the point of crossing The age at which crossing occurred called merging age was found to depend on site index This relationship is also shown in footnotes to appropriate yield tables
Yield in board feet was developed by applying the board-foot-cubicshyfoot ratios determined from multiple regression to the calculated cubic-foot yield of trees larger than 9 5 inches d b h Thus a reasonable relation of board-foot to cubic-foot yields was assured Equations used for calculating board-foot yields (footnotes table 13 were obtained by multiplying the ratio formula by the appropriate cubic-volume yield formula
APPLICA TION
In using the tables to predict yields of specific stands allowances should of course be made for inevitable differences between fully stocked conditions as represented by the tables and actual conditions as encountered in the forest The tables are based oh data from small plots selected for normal stocking and do not characterize stand conditions usually found over wide areas Lower values than those in the tables should therefore be exshypected when yield data are applied to existing stancls
In comparing red alder yields with those of associated conifers two additional factors should be recognized ( 1) red alder stands usually contain more defect than conifer stands of comparable age and (2) an 8-foot scaling length is the basis for board-foot yields of red alder whereas a 16-foot scaling length is used for most conifers
The merging age device used in some tables to smooth out irr)gushylarities should not affect practical application of the yield tables because the loss in accuracy is insignificant
Blocks in tables indicate extent of the basic data
l I
l I i
l l
r i f
I middotI
13oFeet--------------------------------------
-----+-----+----+--
---------------L------L----
IImiddot r Ir rI
I
FIGURE 1
Average total height of dominant and codominant trees
T O T AL HEIGHT
II0
7 0
60
50
40
20 0 10 20 30 40 50 60 70 80
AGE ( Years )
middot ------------------------- --- --- --- --------- ---- ---
70
31 39 47
44 57
25 43 65 79
30 79
35 77
45 67 77
93
75
99
79
94
TABLE 1
Average tota l height of dominant and codominant trees
Site index (feet) Age
(years) 60 80 90 100 110 120
-Feet
10 23 27 35 43
15 31 37 42 47 52 58 63
50 63 6920 38
50 58 72
87 9548 56 63 71
51 60 69 86 94 103
40 55 64 73 82 91 100 109
58 86 96 105 115
so 60 70 80 90 100 110 120
104 114 12455 62 73 83
60 64 86 96 107 118 128
110 121 13265 66 77 88
70 68 90 101 113 124 135
75 69 80 92 103 115 126 138
105 117 129 14180 70 82
Derived from the formula
Site index = (060924 + 19538age) height where site index is for stand age so
76
86
ll
l
f
1 i I
-------------------------------------------
-------------------------------------L------
i middotmiddotmiddotI
ll
middot j i
middot imiddot1
I i l
FIGURE 2
Trees per acre --larger than 05 inch dbh
NUMBER OF TRE ES
000
600
0 1 0 20 30 40 50 60 70 eo
AGE
I
15
55
75
432
144
TABLE 2
Trees per acre--larger than 05 inch dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Number -------------------------
10 4 742 3531 2613 1964 1469
1702 1410 1171 956
20 919 808 695 674 512
1 111 851
779 643 528
441 376
334 291
267 239
225 202
194 184
178 169
165 156
151
139 133
128 122
117 112
106 102
96 93
609 543 48625 378
30 445 404 368 333 300
35 345 321 296 272 248
40 282 265 247 231 212
45 239 229 218 205 190
50 209 203 196 184 172
60
173 172 169 165 159
157 157 154 150 145
141 139 137 132
70 126 124 121
65
80
112 109
98
Number of trees obtained by dividing total basal area by basal area of average tree
middot i ll
f i I bull bull I
I
FIGURE 3
Trees per acre--larger than 55 inches dbh
NUMBER OF TREES
I
10 30 40 50 60 70 80
AGE Years
------------------------
I
I
------- ------- ------ - - - --I
25
40
45
55
75
144
93
TABLE 3
Trees per acre-- larger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
Number
10 158 169 166 158
15 158 201 220 223 219 211 199
20 220 239 247 244 236 226 211
30
241 248 250 244 236 225 211
240 245 245 238 227 217 204
235 231 224 216 205 19335 232
50
219 221 217 210 201 191 181
205 205 201 194 186 178 169
188 188 185 179 172 165 156
172 169 165 159 151171
60 155 157 154 150 145 139 133
65 141 139 137 132 128 122
70 126 124 121 117 112
112 109 106 102
80 98 96
Number of trees obtained by dividing total basal area by basal area of average tree
1
FIGURE 4
Trees per acre--larger than 95 inches dbh
NUMBER OF TREES
ii
20 30 40 50 60 70 80
AGE ( Years
I
24 57
95
93
24 34 44
93
144
93
TABLE 4
Treesper acre--larger than 95 inches db h
Site index (feet) Age
(years) 60 70 80 90 100 llO 120
-- -------- -------- ------ l1umber -------------------------20 12
25 15 30 44 56 67 76
30 41 70 82 102
63 78 92 101 ll3 12135 46
40 63 80 108 118 128 135
45 77 108 119 129 138 144
50 86 103 116 127 136 144 148
55 93 108 121 131 140 143
60 96 111 123 132 138 138 133
65 96 llO 122 130 131 128 122
70 94 119 122 121 ll7 ll2
75 1ll 112 109 106 102
80 103 100 98 96
Number of trees obtained by div iding total basal area by basal area of average tree
l j
------------------------------r-----------
1----------1-------1--------+---
1--------+--------11---
----L-----------------------------L------
FIGURE 5
Diame ter of average tree-shylarger than 05 inch db h
DI AME TE R
200 Inches
I 40
120
0 10 20 30 40 50 60 70 eo
AGE Years
1
I
I
70
15
25
35
40
50
70
97
48
83
27
40
54
53 35
TABLE 5
Diameter of average tree-shylarger than 05 inch dbh
S ite index (feet)Age (years)
60 80 90 100 110 120
------------------------ Inches ------------------------shy
31 36 42
51 58
65 72
72 79 87
92 100
105 114
117 124
127 134
136 143
146 153
155 163
164 172
173 182
182 191
16 19 2310
28 32 36 46
20 40 44 59
51 55 60 66
30 61 66 72 78 85
71 77 90 97
80 86 93 100 108bull 89 96 103 11145 119
104 112 120 129
55 108
60 115
65
116 123 131 138
123 131 139 147
130 139 147 155
75
146middot 155 164
163 172
80 18 1 191 20o
------------------------ Years --------------------------55 56 56 49 43Merging age
1 Up to merging age Diameter of average tree = - 083 + 02045 (age) - 0001153 (age)2
0 000284 (site index) 2
- 0 0192 (site index) + + 0001103 (s ite index) (age)
Above merging age Diameter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 000091l (site index) (age)
Merging age = 675 + 13625 (site index) - 0009375 (site index)2
1
I jbull I
lmiddot j I L j
i middot
l
l t i i H )l
1 middot I
I 1 lc
lnches--------------r--------------------------
1----------+-------+---------t--
-------------------L------------------------
200
140
60 70 80
FIGURE 6
Diameter of average tree-shylarger than 55 inches dbh
DI AME T E R
middot bull1
1 20
100
80
60
40
20
0 10 20 30 40 50
AGE Yeo rs
I 52
15 53
79
45
55
70
75
TABLE 6
Diame ter of average tree-shylarger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Inches --- ----------------------55 58 62
69 72
74 79 83
88 93
93 98 103
108 114
117 124
127 134
136 143
146 153
163155
164 172
173 182
182 191
200191
I 10
49 57 61 65
20
25
30
35
40
so
60
65
57 61
65 69 74
72 77
8579
93 9987
94 101
101 108
108 116
123115
130
66 70
84
83 88
91 97 102
105 111
107 114 120
115 122 12 9
123 131 138
131 139 147
139 147 155
146 155 bull164
163 172
f 80 181t Diameter of average tree = 109 + 01057 (age) - 0 000198 (age)2
+ 00247 (si te index) + 0000911 (site index)(age)
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
l l l
I I i I l I l l
3 Plot location restricted to a uniform part of the stand
4 Plot size of 1 I 40 acre for stands under 10 years old 1 I 10 acre for stands 10 to 20 years old and 1 I5 acre for stands over 20 years old
Data taken for each plot included
1 Diameter of all trees larger than 0 5 inch d b h by species and l -inch diameter classes
2 Stand age determi ed from breast-high increment borings of five trees in the upper canopy
3 Total height of the five trees bored for age and of an additional five trees to fill out stand diameter range
Site curves were developed from stem analyses of 43 felled and sec- tioned trees distributed throughout western Washington Th index stand age for the curve is 50 years with stand age defined as breast-high age plus 2 years This middotmethod of site indexing involving multiple regression was described by Bishop et all_
Yield data were derived for the following stand characteristics
1 Trees per acre
2 Basal area per acre
l
3 Diameter of average tree
4 Cubic feet per acre
5 Board feet per acre Scribner rule
ANALYSIS PROCEDURE
Multiple regression analyses were used to calculate the formulas that express the basic relations of stand characteristics such as basal area diameter and volume to stand age and site index Yield tables and figures were then derived from the formulas Dependent variables in the regression analyses were basal area average diameter cubic volume and board-footshycubic-foot ratio (from which board-foot yields were calculated) Independent
I 3_1Bishop Da iel M Johnson Floyd A and Staebler George R
I Site curves for red alder US Forest Serv Pac NW Forest and Range Expt Sta Res Note l 62 7pp illus 1958 (Processeci)
I -2shy
I
-3-
variables included first second and third powers of stand age first and second powers of site index and the product of stand age and site index The most effective combinations of the independent variables were used in develshyoping the final yield formulas which are shown in footnotes to appropriate yield tables
For three stand attributes--basal area average diameter and cubic volume--separate analyses were made for the following three stand segments
1 All trees larger than 0 5 inch d b h
2 All trees larger than 5 5 inches d b h
3 All trees larger than 9 5 inches d b h I
Because of limited and naturally variable data the regressions for the differshyent stand segments invariably crossed This problem of crossing was arbishytrarily resolved by using the regression for the stand segment larger than 5 5 inches above the point of crossing The age at which crossing occurred called merging age was found to depend on site index This relationship is also shown in footnotes to appropriate yield tables
Yield in board feet was developed by applying the board-foot-cubicshyfoot ratios determined from multiple regression to the calculated cubic-foot yield of trees larger than 9 5 inches d b h Thus a reasonable relation of board-foot to cubic-foot yields was assured Equations used for calculating board-foot yields (footnotes table 13 were obtained by multiplying the ratio formula by the appropriate cubic-volume yield formula
APPLICA TION
In using the tables to predict yields of specific stands allowances should of course be made for inevitable differences between fully stocked conditions as represented by the tables and actual conditions as encountered in the forest The tables are based oh data from small plots selected for normal stocking and do not characterize stand conditions usually found over wide areas Lower values than those in the tables should therefore be exshypected when yield data are applied to existing stancls
In comparing red alder yields with those of associated conifers two additional factors should be recognized ( 1) red alder stands usually contain more defect than conifer stands of comparable age and (2) an 8-foot scaling length is the basis for board-foot yields of red alder whereas a 16-foot scaling length is used for most conifers
The merging age device used in some tables to smooth out irr)gushylarities should not affect practical application of the yield tables because the loss in accuracy is insignificant
Blocks in tables indicate extent of the basic data
l I
l I i
l l
r i f
I middotI
13oFeet--------------------------------------
-----+-----+----+--
---------------L------L----
IImiddot r Ir rI
I
FIGURE 1
Average total height of dominant and codominant trees
T O T AL HEIGHT
II0
7 0
60
50
40
20 0 10 20 30 40 50 60 70 80
AGE ( Years )
middot ------------------------- --- --- --- --------- ---- ---
70
31 39 47
44 57
25 43 65 79
30 79
35 77
45 67 77
93
75
99
79
94
TABLE 1
Average tota l height of dominant and codominant trees
Site index (feet) Age
(years) 60 80 90 100 110 120
-Feet
10 23 27 35 43
15 31 37 42 47 52 58 63
50 63 6920 38
50 58 72
87 9548 56 63 71
51 60 69 86 94 103
40 55 64 73 82 91 100 109
58 86 96 105 115
so 60 70 80 90 100 110 120
104 114 12455 62 73 83
60 64 86 96 107 118 128
110 121 13265 66 77 88
70 68 90 101 113 124 135
75 69 80 92 103 115 126 138
105 117 129 14180 70 82
Derived from the formula
Site index = (060924 + 19538age) height where site index is for stand age so
76
86
ll
l
f
1 i I
-------------------------------------------
-------------------------------------L------
i middotmiddotmiddotI
ll
middot j i
middot imiddot1
I i l
FIGURE 2
Trees per acre --larger than 05 inch dbh
NUMBER OF TRE ES
000
600
0 1 0 20 30 40 50 60 70 eo
AGE
I
15
55
75
432
144
TABLE 2
Trees per acre--larger than 05 inch dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Number -------------------------
10 4 742 3531 2613 1964 1469
1702 1410 1171 956
20 919 808 695 674 512
1 111 851
779 643 528
441 376
334 291
267 239
225 202
194 184
178 169
165 156
151
139 133
128 122
117 112
106 102
96 93
609 543 48625 378
30 445 404 368 333 300
35 345 321 296 272 248
40 282 265 247 231 212
45 239 229 218 205 190
50 209 203 196 184 172
60
173 172 169 165 159
157 157 154 150 145
141 139 137 132
70 126 124 121
65
80
112 109
98
Number of trees obtained by dividing total basal area by basal area of average tree
middot i ll
f i I bull bull I
I
FIGURE 3
Trees per acre--larger than 55 inches dbh
NUMBER OF TREES
I
10 30 40 50 60 70 80
AGE Years
------------------------
I
I
------- ------- ------ - - - --I
25
40
45
55
75
144
93
TABLE 3
Trees per acre-- larger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
Number
10 158 169 166 158
15 158 201 220 223 219 211 199
20 220 239 247 244 236 226 211
30
241 248 250 244 236 225 211
240 245 245 238 227 217 204
235 231 224 216 205 19335 232
50
219 221 217 210 201 191 181
205 205 201 194 186 178 169
188 188 185 179 172 165 156
172 169 165 159 151171
60 155 157 154 150 145 139 133
65 141 139 137 132 128 122
70 126 124 121 117 112
112 109 106 102
80 98 96
Number of trees obtained by dividing total basal area by basal area of average tree
1
FIGURE 4
Trees per acre--larger than 95 inches dbh
NUMBER OF TREES
ii
20 30 40 50 60 70 80
AGE ( Years
I
24 57
95
93
24 34 44
93
144
93
TABLE 4
Treesper acre--larger than 95 inches db h
Site index (feet) Age
(years) 60 70 80 90 100 llO 120
-- -------- -------- ------ l1umber -------------------------20 12
25 15 30 44 56 67 76
30 41 70 82 102
63 78 92 101 ll3 12135 46
40 63 80 108 118 128 135
45 77 108 119 129 138 144
50 86 103 116 127 136 144 148
55 93 108 121 131 140 143
60 96 111 123 132 138 138 133
65 96 llO 122 130 131 128 122
70 94 119 122 121 ll7 ll2
75 1ll 112 109 106 102
80 103 100 98 96
Number of trees obtained by div iding total basal area by basal area of average tree
l j
------------------------------r-----------
1----------1-------1--------+---
1--------+--------11---
----L-----------------------------L------
FIGURE 5
Diame ter of average tree-shylarger than 05 inch db h
DI AME TE R
200 Inches
I 40
120
0 10 20 30 40 50 60 70 eo
AGE Years
1
I
I
70
15
25
35
40
50
70
97
48
83
27
40
54
53 35
TABLE 5
Diameter of average tree-shylarger than 05 inch dbh
S ite index (feet)Age (years)
60 80 90 100 110 120
------------------------ Inches ------------------------shy
31 36 42
51 58
65 72
72 79 87
92 100
105 114
117 124
127 134
136 143
146 153
155 163
164 172
173 182
182 191
16 19 2310
28 32 36 46
20 40 44 59
51 55 60 66
30 61 66 72 78 85
71 77 90 97
80 86 93 100 108bull 89 96 103 11145 119
104 112 120 129
55 108
60 115
65
116 123 131 138
123 131 139 147
130 139 147 155
75
146middot 155 164
163 172
80 18 1 191 20o
------------------------ Years --------------------------55 56 56 49 43Merging age
1 Up to merging age Diameter of average tree = - 083 + 02045 (age) - 0001153 (age)2
0 000284 (site index) 2
- 0 0192 (site index) + + 0001103 (s ite index) (age)
Above merging age Diameter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 000091l (site index) (age)
Merging age = 675 + 13625 (site index) - 0009375 (site index)2
1
I jbull I
lmiddot j I L j
i middot
l
l t i i H )l
1 middot I
I 1 lc
lnches--------------r--------------------------
1----------+-------+---------t--
-------------------L------------------------
200
140
60 70 80
FIGURE 6
Diameter of average tree-shylarger than 55 inches dbh
DI AME T E R
middot bull1
1 20
100
80
60
40
20
0 10 20 30 40 50
AGE Yeo rs
I 52
15 53
79
45
55
70
75
TABLE 6
Diame ter of average tree-shylarger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Inches --- ----------------------55 58 62
69 72
74 79 83
88 93
93 98 103
108 114
117 124
127 134
136 143
146 153
163155
164 172
173 182
182 191
200191
I 10
49 57 61 65
20
25
30
35
40
so
60
65
57 61
65 69 74
72 77
8579
93 9987
94 101
101 108
108 116
123115
130
66 70
84
83 88
91 97 102
105 111
107 114 120
115 122 12 9
123 131 138
131 139 147
139 147 155
146 155 bull164
163 172
f 80 181t Diameter of average tree = 109 + 01057 (age) - 0 000198 (age)2
+ 00247 (si te index) + 0000911 (site index)(age)
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
-3-
variables included first second and third powers of stand age first and second powers of site index and the product of stand age and site index The most effective combinations of the independent variables were used in develshyoping the final yield formulas which are shown in footnotes to appropriate yield tables
For three stand attributes--basal area average diameter and cubic volume--separate analyses were made for the following three stand segments
1 All trees larger than 0 5 inch d b h
2 All trees larger than 5 5 inches d b h
3 All trees larger than 9 5 inches d b h I
Because of limited and naturally variable data the regressions for the differshyent stand segments invariably crossed This problem of crossing was arbishytrarily resolved by using the regression for the stand segment larger than 5 5 inches above the point of crossing The age at which crossing occurred called merging age was found to depend on site index This relationship is also shown in footnotes to appropriate yield tables
Yield in board feet was developed by applying the board-foot-cubicshyfoot ratios determined from multiple regression to the calculated cubic-foot yield of trees larger than 9 5 inches d b h Thus a reasonable relation of board-foot to cubic-foot yields was assured Equations used for calculating board-foot yields (footnotes table 13 were obtained by multiplying the ratio formula by the appropriate cubic-volume yield formula
APPLICA TION
In using the tables to predict yields of specific stands allowances should of course be made for inevitable differences between fully stocked conditions as represented by the tables and actual conditions as encountered in the forest The tables are based oh data from small plots selected for normal stocking and do not characterize stand conditions usually found over wide areas Lower values than those in the tables should therefore be exshypected when yield data are applied to existing stancls
In comparing red alder yields with those of associated conifers two additional factors should be recognized ( 1) red alder stands usually contain more defect than conifer stands of comparable age and (2) an 8-foot scaling length is the basis for board-foot yields of red alder whereas a 16-foot scaling length is used for most conifers
The merging age device used in some tables to smooth out irr)gushylarities should not affect practical application of the yield tables because the loss in accuracy is insignificant
Blocks in tables indicate extent of the basic data
l I
l I i
l l
r i f
I middotI
13oFeet--------------------------------------
-----+-----+----+--
---------------L------L----
IImiddot r Ir rI
I
FIGURE 1
Average total height of dominant and codominant trees
T O T AL HEIGHT
II0
7 0
60
50
40
20 0 10 20 30 40 50 60 70 80
AGE ( Years )
middot ------------------------- --- --- --- --------- ---- ---
70
31 39 47
44 57
25 43 65 79
30 79
35 77
45 67 77
93
75
99
79
94
TABLE 1
Average tota l height of dominant and codominant trees
Site index (feet) Age
(years) 60 80 90 100 110 120
-Feet
10 23 27 35 43
15 31 37 42 47 52 58 63
50 63 6920 38
50 58 72
87 9548 56 63 71
51 60 69 86 94 103
40 55 64 73 82 91 100 109
58 86 96 105 115
so 60 70 80 90 100 110 120
104 114 12455 62 73 83
60 64 86 96 107 118 128
110 121 13265 66 77 88
70 68 90 101 113 124 135
75 69 80 92 103 115 126 138
105 117 129 14180 70 82
Derived from the formula
Site index = (060924 + 19538age) height where site index is for stand age so
76
86
ll
l
f
1 i I
-------------------------------------------
-------------------------------------L------
i middotmiddotmiddotI
ll
middot j i
middot imiddot1
I i l
FIGURE 2
Trees per acre --larger than 05 inch dbh
NUMBER OF TRE ES
000
600
0 1 0 20 30 40 50 60 70 eo
AGE
I
15
55
75
432
144
TABLE 2
Trees per acre--larger than 05 inch dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Number -------------------------
10 4 742 3531 2613 1964 1469
1702 1410 1171 956
20 919 808 695 674 512
1 111 851
779 643 528
441 376
334 291
267 239
225 202
194 184
178 169
165 156
151
139 133
128 122
117 112
106 102
96 93
609 543 48625 378
30 445 404 368 333 300
35 345 321 296 272 248
40 282 265 247 231 212
45 239 229 218 205 190
50 209 203 196 184 172
60
173 172 169 165 159
157 157 154 150 145
141 139 137 132
70 126 124 121
65
80
112 109
98
Number of trees obtained by dividing total basal area by basal area of average tree
middot i ll
f i I bull bull I
I
FIGURE 3
Trees per acre--larger than 55 inches dbh
NUMBER OF TREES
I
10 30 40 50 60 70 80
AGE Years
------------------------
I
I
------- ------- ------ - - - --I
25
40
45
55
75
144
93
TABLE 3
Trees per acre-- larger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
Number
10 158 169 166 158
15 158 201 220 223 219 211 199
20 220 239 247 244 236 226 211
30
241 248 250 244 236 225 211
240 245 245 238 227 217 204
235 231 224 216 205 19335 232
50
219 221 217 210 201 191 181
205 205 201 194 186 178 169
188 188 185 179 172 165 156
172 169 165 159 151171
60 155 157 154 150 145 139 133
65 141 139 137 132 128 122
70 126 124 121 117 112
112 109 106 102
80 98 96
Number of trees obtained by dividing total basal area by basal area of average tree
1
FIGURE 4
Trees per acre--larger than 95 inches dbh
NUMBER OF TREES
ii
20 30 40 50 60 70 80
AGE ( Years
I
24 57
95
93
24 34 44
93
144
93
TABLE 4
Treesper acre--larger than 95 inches db h
Site index (feet) Age
(years) 60 70 80 90 100 llO 120
-- -------- -------- ------ l1umber -------------------------20 12
25 15 30 44 56 67 76
30 41 70 82 102
63 78 92 101 ll3 12135 46
40 63 80 108 118 128 135
45 77 108 119 129 138 144
50 86 103 116 127 136 144 148
55 93 108 121 131 140 143
60 96 111 123 132 138 138 133
65 96 llO 122 130 131 128 122
70 94 119 122 121 ll7 ll2
75 1ll 112 109 106 102
80 103 100 98 96
Number of trees obtained by div iding total basal area by basal area of average tree
l j
------------------------------r-----------
1----------1-------1--------+---
1--------+--------11---
----L-----------------------------L------
FIGURE 5
Diame ter of average tree-shylarger than 05 inch db h
DI AME TE R
200 Inches
I 40
120
0 10 20 30 40 50 60 70 eo
AGE Years
1
I
I
70
15
25
35
40
50
70
97
48
83
27
40
54
53 35
TABLE 5
Diameter of average tree-shylarger than 05 inch dbh
S ite index (feet)Age (years)
60 80 90 100 110 120
------------------------ Inches ------------------------shy
31 36 42
51 58
65 72
72 79 87
92 100
105 114
117 124
127 134
136 143
146 153
155 163
164 172
173 182
182 191
16 19 2310
28 32 36 46
20 40 44 59
51 55 60 66
30 61 66 72 78 85
71 77 90 97
80 86 93 100 108bull 89 96 103 11145 119
104 112 120 129
55 108
60 115
65
116 123 131 138
123 131 139 147
130 139 147 155
75
146middot 155 164
163 172
80 18 1 191 20o
------------------------ Years --------------------------55 56 56 49 43Merging age
1 Up to merging age Diameter of average tree = - 083 + 02045 (age) - 0001153 (age)2
0 000284 (site index) 2
- 0 0192 (site index) + + 0001103 (s ite index) (age)
Above merging age Diameter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 000091l (site index) (age)
Merging age = 675 + 13625 (site index) - 0009375 (site index)2
1
I jbull I
lmiddot j I L j
i middot
l
l t i i H )l
1 middot I
I 1 lc
lnches--------------r--------------------------
1----------+-------+---------t--
-------------------L------------------------
200
140
60 70 80
FIGURE 6
Diameter of average tree-shylarger than 55 inches dbh
DI AME T E R
middot bull1
1 20
100
80
60
40
20
0 10 20 30 40 50
AGE Yeo rs
I 52
15 53
79
45
55
70
75
TABLE 6
Diame ter of average tree-shylarger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Inches --- ----------------------55 58 62
69 72
74 79 83
88 93
93 98 103
108 114
117 124
127 134
136 143
146 153
163155
164 172
173 182
182 191
200191
I 10
49 57 61 65
20
25
30
35
40
so
60
65
57 61
65 69 74
72 77
8579
93 9987
94 101
101 108
108 116
123115
130
66 70
84
83 88
91 97 102
105 111
107 114 120
115 122 12 9
123 131 138
131 139 147
139 147 155
146 155 bull164
163 172
f 80 181t Diameter of average tree = 109 + 01057 (age) - 0 000198 (age)2
+ 00247 (si te index) + 0000911 (site index)(age)
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
l I
l I i
l l
r i f
I middotI
13oFeet--------------------------------------
-----+-----+----+--
---------------L------L----
IImiddot r Ir rI
I
FIGURE 1
Average total height of dominant and codominant trees
T O T AL HEIGHT
II0
7 0
60
50
40
20 0 10 20 30 40 50 60 70 80
AGE ( Years )
middot ------------------------- --- --- --- --------- ---- ---
70
31 39 47
44 57
25 43 65 79
30 79
35 77
45 67 77
93
75
99
79
94
TABLE 1
Average tota l height of dominant and codominant trees
Site index (feet) Age
(years) 60 80 90 100 110 120
-Feet
10 23 27 35 43
15 31 37 42 47 52 58 63
50 63 6920 38
50 58 72
87 9548 56 63 71
51 60 69 86 94 103
40 55 64 73 82 91 100 109
58 86 96 105 115
so 60 70 80 90 100 110 120
104 114 12455 62 73 83
60 64 86 96 107 118 128
110 121 13265 66 77 88
70 68 90 101 113 124 135
75 69 80 92 103 115 126 138
105 117 129 14180 70 82
Derived from the formula
Site index = (060924 + 19538age) height where site index is for stand age so
76
86
ll
l
f
1 i I
-------------------------------------------
-------------------------------------L------
i middotmiddotmiddotI
ll
middot j i
middot imiddot1
I i l
FIGURE 2
Trees per acre --larger than 05 inch dbh
NUMBER OF TRE ES
000
600
0 1 0 20 30 40 50 60 70 eo
AGE
I
15
55
75
432
144
TABLE 2
Trees per acre--larger than 05 inch dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Number -------------------------
10 4 742 3531 2613 1964 1469
1702 1410 1171 956
20 919 808 695 674 512
1 111 851
779 643 528
441 376
334 291
267 239
225 202
194 184
178 169
165 156
151
139 133
128 122
117 112
106 102
96 93
609 543 48625 378
30 445 404 368 333 300
35 345 321 296 272 248
40 282 265 247 231 212
45 239 229 218 205 190
50 209 203 196 184 172
60
173 172 169 165 159
157 157 154 150 145
141 139 137 132
70 126 124 121
65
80
112 109
98
Number of trees obtained by dividing total basal area by basal area of average tree
middot i ll
f i I bull bull I
I
FIGURE 3
Trees per acre--larger than 55 inches dbh
NUMBER OF TREES
I
10 30 40 50 60 70 80
AGE Years
------------------------
I
I
------- ------- ------ - - - --I
25
40
45
55
75
144
93
TABLE 3
Trees per acre-- larger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
Number
10 158 169 166 158
15 158 201 220 223 219 211 199
20 220 239 247 244 236 226 211
30
241 248 250 244 236 225 211
240 245 245 238 227 217 204
235 231 224 216 205 19335 232
50
219 221 217 210 201 191 181
205 205 201 194 186 178 169
188 188 185 179 172 165 156
172 169 165 159 151171
60 155 157 154 150 145 139 133
65 141 139 137 132 128 122
70 126 124 121 117 112
112 109 106 102
80 98 96
Number of trees obtained by dividing total basal area by basal area of average tree
1
FIGURE 4
Trees per acre--larger than 95 inches dbh
NUMBER OF TREES
ii
20 30 40 50 60 70 80
AGE ( Years
I
24 57
95
93
24 34 44
93
144
93
TABLE 4
Treesper acre--larger than 95 inches db h
Site index (feet) Age
(years) 60 70 80 90 100 llO 120
-- -------- -------- ------ l1umber -------------------------20 12
25 15 30 44 56 67 76
30 41 70 82 102
63 78 92 101 ll3 12135 46
40 63 80 108 118 128 135
45 77 108 119 129 138 144
50 86 103 116 127 136 144 148
55 93 108 121 131 140 143
60 96 111 123 132 138 138 133
65 96 llO 122 130 131 128 122
70 94 119 122 121 ll7 ll2
75 1ll 112 109 106 102
80 103 100 98 96
Number of trees obtained by div iding total basal area by basal area of average tree
l j
------------------------------r-----------
1----------1-------1--------+---
1--------+--------11---
----L-----------------------------L------
FIGURE 5
Diame ter of average tree-shylarger than 05 inch db h
DI AME TE R
200 Inches
I 40
120
0 10 20 30 40 50 60 70 eo
AGE Years
1
I
I
70
15
25
35
40
50
70
97
48
83
27
40
54
53 35
TABLE 5
Diameter of average tree-shylarger than 05 inch dbh
S ite index (feet)Age (years)
60 80 90 100 110 120
------------------------ Inches ------------------------shy
31 36 42
51 58
65 72
72 79 87
92 100
105 114
117 124
127 134
136 143
146 153
155 163
164 172
173 182
182 191
16 19 2310
28 32 36 46
20 40 44 59
51 55 60 66
30 61 66 72 78 85
71 77 90 97
80 86 93 100 108bull 89 96 103 11145 119
104 112 120 129
55 108
60 115
65
116 123 131 138
123 131 139 147
130 139 147 155
75
146middot 155 164
163 172
80 18 1 191 20o
------------------------ Years --------------------------55 56 56 49 43Merging age
1 Up to merging age Diameter of average tree = - 083 + 02045 (age) - 0001153 (age)2
0 000284 (site index) 2
- 0 0192 (site index) + + 0001103 (s ite index) (age)
Above merging age Diameter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 000091l (site index) (age)
Merging age = 675 + 13625 (site index) - 0009375 (site index)2
1
I jbull I
lmiddot j I L j
i middot
l
l t i i H )l
1 middot I
I 1 lc
lnches--------------r--------------------------
1----------+-------+---------t--
-------------------L------------------------
200
140
60 70 80
FIGURE 6
Diameter of average tree-shylarger than 55 inches dbh
DI AME T E R
middot bull1
1 20
100
80
60
40
20
0 10 20 30 40 50
AGE Yeo rs
I 52
15 53
79
45
55
70
75
TABLE 6
Diame ter of average tree-shylarger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Inches --- ----------------------55 58 62
69 72
74 79 83
88 93
93 98 103
108 114
117 124
127 134
136 143
146 153
163155
164 172
173 182
182 191
200191
I 10
49 57 61 65
20
25
30
35
40
so
60
65
57 61
65 69 74
72 77
8579
93 9987
94 101
101 108
108 116
123115
130
66 70
84
83 88
91 97 102
105 111
107 114 120
115 122 12 9
123 131 138
131 139 147
139 147 155
146 155 bull164
163 172
f 80 181t Diameter of average tree = 109 + 01057 (age) - 0 000198 (age)2
+ 00247 (si te index) + 0000911 (site index)(age)
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
middot ------------------------- --- --- --- --------- ---- ---
70
31 39 47
44 57
25 43 65 79
30 79
35 77
45 67 77
93
75
99
79
94
TABLE 1
Average tota l height of dominant and codominant trees
Site index (feet) Age
(years) 60 80 90 100 110 120
-Feet
10 23 27 35 43
15 31 37 42 47 52 58 63
50 63 6920 38
50 58 72
87 9548 56 63 71
51 60 69 86 94 103
40 55 64 73 82 91 100 109
58 86 96 105 115
so 60 70 80 90 100 110 120
104 114 12455 62 73 83
60 64 86 96 107 118 128
110 121 13265 66 77 88
70 68 90 101 113 124 135
75 69 80 92 103 115 126 138
105 117 129 14180 70 82
Derived from the formula
Site index = (060924 + 19538age) height where site index is for stand age so
76
86
ll
l
f
1 i I
-------------------------------------------
-------------------------------------L------
i middotmiddotmiddotI
ll
middot j i
middot imiddot1
I i l
FIGURE 2
Trees per acre --larger than 05 inch dbh
NUMBER OF TRE ES
000
600
0 1 0 20 30 40 50 60 70 eo
AGE
I
15
55
75
432
144
TABLE 2
Trees per acre--larger than 05 inch dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Number -------------------------
10 4 742 3531 2613 1964 1469
1702 1410 1171 956
20 919 808 695 674 512
1 111 851
779 643 528
441 376
334 291
267 239
225 202
194 184
178 169
165 156
151
139 133
128 122
117 112
106 102
96 93
609 543 48625 378
30 445 404 368 333 300
35 345 321 296 272 248
40 282 265 247 231 212
45 239 229 218 205 190
50 209 203 196 184 172
60
173 172 169 165 159
157 157 154 150 145
141 139 137 132
70 126 124 121
65
80
112 109
98
Number of trees obtained by dividing total basal area by basal area of average tree
middot i ll
f i I bull bull I
I
FIGURE 3
Trees per acre--larger than 55 inches dbh
NUMBER OF TREES
I
10 30 40 50 60 70 80
AGE Years
------------------------
I
I
------- ------- ------ - - - --I
25
40
45
55
75
144
93
TABLE 3
Trees per acre-- larger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
Number
10 158 169 166 158
15 158 201 220 223 219 211 199
20 220 239 247 244 236 226 211
30
241 248 250 244 236 225 211
240 245 245 238 227 217 204
235 231 224 216 205 19335 232
50
219 221 217 210 201 191 181
205 205 201 194 186 178 169
188 188 185 179 172 165 156
172 169 165 159 151171
60 155 157 154 150 145 139 133
65 141 139 137 132 128 122
70 126 124 121 117 112
112 109 106 102
80 98 96
Number of trees obtained by dividing total basal area by basal area of average tree
1
FIGURE 4
Trees per acre--larger than 95 inches dbh
NUMBER OF TREES
ii
20 30 40 50 60 70 80
AGE ( Years
I
24 57
95
93
24 34 44
93
144
93
TABLE 4
Treesper acre--larger than 95 inches db h
Site index (feet) Age
(years) 60 70 80 90 100 llO 120
-- -------- -------- ------ l1umber -------------------------20 12
25 15 30 44 56 67 76
30 41 70 82 102
63 78 92 101 ll3 12135 46
40 63 80 108 118 128 135
45 77 108 119 129 138 144
50 86 103 116 127 136 144 148
55 93 108 121 131 140 143
60 96 111 123 132 138 138 133
65 96 llO 122 130 131 128 122
70 94 119 122 121 ll7 ll2
75 1ll 112 109 106 102
80 103 100 98 96
Number of trees obtained by div iding total basal area by basal area of average tree
l j
------------------------------r-----------
1----------1-------1--------+---
1--------+--------11---
----L-----------------------------L------
FIGURE 5
Diame ter of average tree-shylarger than 05 inch db h
DI AME TE R
200 Inches
I 40
120
0 10 20 30 40 50 60 70 eo
AGE Years
1
I
I
70
15
25
35
40
50
70
97
48
83
27
40
54
53 35
TABLE 5
Diameter of average tree-shylarger than 05 inch dbh
S ite index (feet)Age (years)
60 80 90 100 110 120
------------------------ Inches ------------------------shy
31 36 42
51 58
65 72
72 79 87
92 100
105 114
117 124
127 134
136 143
146 153
155 163
164 172
173 182
182 191
16 19 2310
28 32 36 46
20 40 44 59
51 55 60 66
30 61 66 72 78 85
71 77 90 97
80 86 93 100 108bull 89 96 103 11145 119
104 112 120 129
55 108
60 115
65
116 123 131 138
123 131 139 147
130 139 147 155
75
146middot 155 164
163 172
80 18 1 191 20o
------------------------ Years --------------------------55 56 56 49 43Merging age
1 Up to merging age Diameter of average tree = - 083 + 02045 (age) - 0001153 (age)2
0 000284 (site index) 2
- 0 0192 (site index) + + 0001103 (s ite index) (age)
Above merging age Diameter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 000091l (site index) (age)
Merging age = 675 + 13625 (site index) - 0009375 (site index)2
1
I jbull I
lmiddot j I L j
i middot
l
l t i i H )l
1 middot I
I 1 lc
lnches--------------r--------------------------
1----------+-------+---------t--
-------------------L------------------------
200
140
60 70 80
FIGURE 6
Diameter of average tree-shylarger than 55 inches dbh
DI AME T E R
middot bull1
1 20
100
80
60
40
20
0 10 20 30 40 50
AGE Yeo rs
I 52
15 53
79
45
55
70
75
TABLE 6
Diame ter of average tree-shylarger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Inches --- ----------------------55 58 62
69 72
74 79 83
88 93
93 98 103
108 114
117 124
127 134
136 143
146 153
163155
164 172
173 182
182 191
200191
I 10
49 57 61 65
20
25
30
35
40
so
60
65
57 61
65 69 74
72 77
8579
93 9987
94 101
101 108
108 116
123115
130
66 70
84
83 88
91 97 102
105 111
107 114 120
115 122 12 9
123 131 138
131 139 147
139 147 155
146 155 bull164
163 172
f 80 181t Diameter of average tree = 109 + 01057 (age) - 0 000198 (age)2
+ 00247 (si te index) + 0000911 (site index)(age)
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
ll
l
f
1 i I
-------------------------------------------
-------------------------------------L------
i middotmiddotmiddotI
ll
middot j i
middot imiddot1
I i l
FIGURE 2
Trees per acre --larger than 05 inch dbh
NUMBER OF TRE ES
000
600
0 1 0 20 30 40 50 60 70 eo
AGE
I
15
55
75
432
144
TABLE 2
Trees per acre--larger than 05 inch dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Number -------------------------
10 4 742 3531 2613 1964 1469
1702 1410 1171 956
20 919 808 695 674 512
1 111 851
779 643 528
441 376
334 291
267 239
225 202
194 184
178 169
165 156
151
139 133
128 122
117 112
106 102
96 93
609 543 48625 378
30 445 404 368 333 300
35 345 321 296 272 248
40 282 265 247 231 212
45 239 229 218 205 190
50 209 203 196 184 172
60
173 172 169 165 159
157 157 154 150 145
141 139 137 132
70 126 124 121
65
80
112 109
98
Number of trees obtained by dividing total basal area by basal area of average tree
middot i ll
f i I bull bull I
I
FIGURE 3
Trees per acre--larger than 55 inches dbh
NUMBER OF TREES
I
10 30 40 50 60 70 80
AGE Years
------------------------
I
I
------- ------- ------ - - - --I
25
40
45
55
75
144
93
TABLE 3
Trees per acre-- larger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
Number
10 158 169 166 158
15 158 201 220 223 219 211 199
20 220 239 247 244 236 226 211
30
241 248 250 244 236 225 211
240 245 245 238 227 217 204
235 231 224 216 205 19335 232
50
219 221 217 210 201 191 181
205 205 201 194 186 178 169
188 188 185 179 172 165 156
172 169 165 159 151171
60 155 157 154 150 145 139 133
65 141 139 137 132 128 122
70 126 124 121 117 112
112 109 106 102
80 98 96
Number of trees obtained by dividing total basal area by basal area of average tree
1
FIGURE 4
Trees per acre--larger than 95 inches dbh
NUMBER OF TREES
ii
20 30 40 50 60 70 80
AGE ( Years
I
24 57
95
93
24 34 44
93
144
93
TABLE 4
Treesper acre--larger than 95 inches db h
Site index (feet) Age
(years) 60 70 80 90 100 llO 120
-- -------- -------- ------ l1umber -------------------------20 12
25 15 30 44 56 67 76
30 41 70 82 102
63 78 92 101 ll3 12135 46
40 63 80 108 118 128 135
45 77 108 119 129 138 144
50 86 103 116 127 136 144 148
55 93 108 121 131 140 143
60 96 111 123 132 138 138 133
65 96 llO 122 130 131 128 122
70 94 119 122 121 ll7 ll2
75 1ll 112 109 106 102
80 103 100 98 96
Number of trees obtained by div iding total basal area by basal area of average tree
l j
------------------------------r-----------
1----------1-------1--------+---
1--------+--------11---
----L-----------------------------L------
FIGURE 5
Diame ter of average tree-shylarger than 05 inch db h
DI AME TE R
200 Inches
I 40
120
0 10 20 30 40 50 60 70 eo
AGE Years
1
I
I
70
15
25
35
40
50
70
97
48
83
27
40
54
53 35
TABLE 5
Diameter of average tree-shylarger than 05 inch dbh
S ite index (feet)Age (years)
60 80 90 100 110 120
------------------------ Inches ------------------------shy
31 36 42
51 58
65 72
72 79 87
92 100
105 114
117 124
127 134
136 143
146 153
155 163
164 172
173 182
182 191
16 19 2310
28 32 36 46
20 40 44 59
51 55 60 66
30 61 66 72 78 85
71 77 90 97
80 86 93 100 108bull 89 96 103 11145 119
104 112 120 129
55 108
60 115
65
116 123 131 138
123 131 139 147
130 139 147 155
75
146middot 155 164
163 172
80 18 1 191 20o
------------------------ Years --------------------------55 56 56 49 43Merging age
1 Up to merging age Diameter of average tree = - 083 + 02045 (age) - 0001153 (age)2
0 000284 (site index) 2
- 0 0192 (site index) + + 0001103 (s ite index) (age)
Above merging age Diameter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 000091l (site index) (age)
Merging age = 675 + 13625 (site index) - 0009375 (site index)2
1
I jbull I
lmiddot j I L j
i middot
l
l t i i H )l
1 middot I
I 1 lc
lnches--------------r--------------------------
1----------+-------+---------t--
-------------------L------------------------
200
140
60 70 80
FIGURE 6
Diameter of average tree-shylarger than 55 inches dbh
DI AME T E R
middot bull1
1 20
100
80
60
40
20
0 10 20 30 40 50
AGE Yeo rs
I 52
15 53
79
45
55
70
75
TABLE 6
Diame ter of average tree-shylarger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Inches --- ----------------------55 58 62
69 72
74 79 83
88 93
93 98 103
108 114
117 124
127 134
136 143
146 153
163155
164 172
173 182
182 191
200191
I 10
49 57 61 65
20
25
30
35
40
so
60
65
57 61
65 69 74
72 77
8579
93 9987
94 101
101 108
108 116
123115
130
66 70
84
83 88
91 97 102
105 111
107 114 120
115 122 12 9
123 131 138
131 139 147
139 147 155
146 155 bull164
163 172
f 80 181t Diameter of average tree = 109 + 01057 (age) - 0 000198 (age)2
+ 00247 (si te index) + 0000911 (site index)(age)
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
I
15
55
75
432
144
TABLE 2
Trees per acre--larger than 05 inch dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Number -------------------------
10 4 742 3531 2613 1964 1469
1702 1410 1171 956
20 919 808 695 674 512
1 111 851
779 643 528
441 376
334 291
267 239
225 202
194 184
178 169
165 156
151
139 133
128 122
117 112
106 102
96 93
609 543 48625 378
30 445 404 368 333 300
35 345 321 296 272 248
40 282 265 247 231 212
45 239 229 218 205 190
50 209 203 196 184 172
60
173 172 169 165 159
157 157 154 150 145
141 139 137 132
70 126 124 121
65
80
112 109
98
Number of trees obtained by dividing total basal area by basal area of average tree
middot i ll
f i I bull bull I
I
FIGURE 3
Trees per acre--larger than 55 inches dbh
NUMBER OF TREES
I
10 30 40 50 60 70 80
AGE Years
------------------------
I
I
------- ------- ------ - - - --I
25
40
45
55
75
144
93
TABLE 3
Trees per acre-- larger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
Number
10 158 169 166 158
15 158 201 220 223 219 211 199
20 220 239 247 244 236 226 211
30
241 248 250 244 236 225 211
240 245 245 238 227 217 204
235 231 224 216 205 19335 232
50
219 221 217 210 201 191 181
205 205 201 194 186 178 169
188 188 185 179 172 165 156
172 169 165 159 151171
60 155 157 154 150 145 139 133
65 141 139 137 132 128 122
70 126 124 121 117 112
112 109 106 102
80 98 96
Number of trees obtained by dividing total basal area by basal area of average tree
1
FIGURE 4
Trees per acre--larger than 95 inches dbh
NUMBER OF TREES
ii
20 30 40 50 60 70 80
AGE ( Years
I
24 57
95
93
24 34 44
93
144
93
TABLE 4
Treesper acre--larger than 95 inches db h
Site index (feet) Age
(years) 60 70 80 90 100 llO 120
-- -------- -------- ------ l1umber -------------------------20 12
25 15 30 44 56 67 76
30 41 70 82 102
63 78 92 101 ll3 12135 46
40 63 80 108 118 128 135
45 77 108 119 129 138 144
50 86 103 116 127 136 144 148
55 93 108 121 131 140 143
60 96 111 123 132 138 138 133
65 96 llO 122 130 131 128 122
70 94 119 122 121 ll7 ll2
75 1ll 112 109 106 102
80 103 100 98 96
Number of trees obtained by div iding total basal area by basal area of average tree
l j
------------------------------r-----------
1----------1-------1--------+---
1--------+--------11---
----L-----------------------------L------
FIGURE 5
Diame ter of average tree-shylarger than 05 inch db h
DI AME TE R
200 Inches
I 40
120
0 10 20 30 40 50 60 70 eo
AGE Years
1
I
I
70
15
25
35
40
50
70
97
48
83
27
40
54
53 35
TABLE 5
Diameter of average tree-shylarger than 05 inch dbh
S ite index (feet)Age (years)
60 80 90 100 110 120
------------------------ Inches ------------------------shy
31 36 42
51 58
65 72
72 79 87
92 100
105 114
117 124
127 134
136 143
146 153
155 163
164 172
173 182
182 191
16 19 2310
28 32 36 46
20 40 44 59
51 55 60 66
30 61 66 72 78 85
71 77 90 97
80 86 93 100 108bull 89 96 103 11145 119
104 112 120 129
55 108
60 115
65
116 123 131 138
123 131 139 147
130 139 147 155
75
146middot 155 164
163 172
80 18 1 191 20o
------------------------ Years --------------------------55 56 56 49 43Merging age
1 Up to merging age Diameter of average tree = - 083 + 02045 (age) - 0001153 (age)2
0 000284 (site index) 2
- 0 0192 (site index) + + 0001103 (s ite index) (age)
Above merging age Diameter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 000091l (site index) (age)
Merging age = 675 + 13625 (site index) - 0009375 (site index)2
1
I jbull I
lmiddot j I L j
i middot
l
l t i i H )l
1 middot I
I 1 lc
lnches--------------r--------------------------
1----------+-------+---------t--
-------------------L------------------------
200
140
60 70 80
FIGURE 6
Diameter of average tree-shylarger than 55 inches dbh
DI AME T E R
middot bull1
1 20
100
80
60
40
20
0 10 20 30 40 50
AGE Yeo rs
I 52
15 53
79
45
55
70
75
TABLE 6
Diame ter of average tree-shylarger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Inches --- ----------------------55 58 62
69 72
74 79 83
88 93
93 98 103
108 114
117 124
127 134
136 143
146 153
163155
164 172
173 182
182 191
200191
I 10
49 57 61 65
20
25
30
35
40
so
60
65
57 61
65 69 74
72 77
8579
93 9987
94 101
101 108
108 116
123115
130
66 70
84
83 88
91 97 102
105 111
107 114 120
115 122 12 9
123 131 138
131 139 147
139 147 155
146 155 bull164
163 172
f 80 181t Diameter of average tree = 109 + 01057 (age) - 0 000198 (age)2
+ 00247 (si te index) + 0000911 (site index)(age)
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
middot i ll
f i I bull bull I
I
FIGURE 3
Trees per acre--larger than 55 inches dbh
NUMBER OF TREES
I
10 30 40 50 60 70 80
AGE Years
------------------------
I
I
------- ------- ------ - - - --I
25
40
45
55
75
144
93
TABLE 3
Trees per acre-- larger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
Number
10 158 169 166 158
15 158 201 220 223 219 211 199
20 220 239 247 244 236 226 211
30
241 248 250 244 236 225 211
240 245 245 238 227 217 204
235 231 224 216 205 19335 232
50
219 221 217 210 201 191 181
205 205 201 194 186 178 169
188 188 185 179 172 165 156
172 169 165 159 151171
60 155 157 154 150 145 139 133
65 141 139 137 132 128 122
70 126 124 121 117 112
112 109 106 102
80 98 96
Number of trees obtained by dividing total basal area by basal area of average tree
1
FIGURE 4
Trees per acre--larger than 95 inches dbh
NUMBER OF TREES
ii
20 30 40 50 60 70 80
AGE ( Years
I
24 57
95
93
24 34 44
93
144
93
TABLE 4
Treesper acre--larger than 95 inches db h
Site index (feet) Age
(years) 60 70 80 90 100 llO 120
-- -------- -------- ------ l1umber -------------------------20 12
25 15 30 44 56 67 76
30 41 70 82 102
63 78 92 101 ll3 12135 46
40 63 80 108 118 128 135
45 77 108 119 129 138 144
50 86 103 116 127 136 144 148
55 93 108 121 131 140 143
60 96 111 123 132 138 138 133
65 96 llO 122 130 131 128 122
70 94 119 122 121 ll7 ll2
75 1ll 112 109 106 102
80 103 100 98 96
Number of trees obtained by div iding total basal area by basal area of average tree
l j
------------------------------r-----------
1----------1-------1--------+---
1--------+--------11---
----L-----------------------------L------
FIGURE 5
Diame ter of average tree-shylarger than 05 inch db h
DI AME TE R
200 Inches
I 40
120
0 10 20 30 40 50 60 70 eo
AGE Years
1
I
I
70
15
25
35
40
50
70
97
48
83
27
40
54
53 35
TABLE 5
Diameter of average tree-shylarger than 05 inch dbh
S ite index (feet)Age (years)
60 80 90 100 110 120
------------------------ Inches ------------------------shy
31 36 42
51 58
65 72
72 79 87
92 100
105 114
117 124
127 134
136 143
146 153
155 163
164 172
173 182
182 191
16 19 2310
28 32 36 46
20 40 44 59
51 55 60 66
30 61 66 72 78 85
71 77 90 97
80 86 93 100 108bull 89 96 103 11145 119
104 112 120 129
55 108
60 115
65
116 123 131 138
123 131 139 147
130 139 147 155
75
146middot 155 164
163 172
80 18 1 191 20o
------------------------ Years --------------------------55 56 56 49 43Merging age
1 Up to merging age Diameter of average tree = - 083 + 02045 (age) - 0001153 (age)2
0 000284 (site index) 2
- 0 0192 (site index) + + 0001103 (s ite index) (age)
Above merging age Diameter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 000091l (site index) (age)
Merging age = 675 + 13625 (site index) - 0009375 (site index)2
1
I jbull I
lmiddot j I L j
i middot
l
l t i i H )l
1 middot I
I 1 lc
lnches--------------r--------------------------
1----------+-------+---------t--
-------------------L------------------------
200
140
60 70 80
FIGURE 6
Diameter of average tree-shylarger than 55 inches dbh
DI AME T E R
middot bull1
1 20
100
80
60
40
20
0 10 20 30 40 50
AGE Yeo rs
I 52
15 53
79
45
55
70
75
TABLE 6
Diame ter of average tree-shylarger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Inches --- ----------------------55 58 62
69 72
74 79 83
88 93
93 98 103
108 114
117 124
127 134
136 143
146 153
163155
164 172
173 182
182 191
200191
I 10
49 57 61 65
20
25
30
35
40
so
60
65
57 61
65 69 74
72 77
8579
93 9987
94 101
101 108
108 116
123115
130
66 70
84
83 88
91 97 102
105 111
107 114 120
115 122 12 9
123 131 138
131 139 147
139 147 155
146 155 bull164
163 172
f 80 181t Diameter of average tree = 109 + 01057 (age) - 0 000198 (age)2
+ 00247 (si te index) + 0000911 (site index)(age)
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
------------------------
I
I
------- ------- ------ - - - --I
25
40
45
55
75
144
93
TABLE 3
Trees per acre-- larger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
Number
10 158 169 166 158
15 158 201 220 223 219 211 199
20 220 239 247 244 236 226 211
30
241 248 250 244 236 225 211
240 245 245 238 227 217 204
235 231 224 216 205 19335 232
50
219 221 217 210 201 191 181
205 205 201 194 186 178 169
188 188 185 179 172 165 156
172 169 165 159 151171
60 155 157 154 150 145 139 133
65 141 139 137 132 128 122
70 126 124 121 117 112
112 109 106 102
80 98 96
Number of trees obtained by dividing total basal area by basal area of average tree
1
FIGURE 4
Trees per acre--larger than 95 inches dbh
NUMBER OF TREES
ii
20 30 40 50 60 70 80
AGE ( Years
I
24 57
95
93
24 34 44
93
144
93
TABLE 4
Treesper acre--larger than 95 inches db h
Site index (feet) Age
(years) 60 70 80 90 100 llO 120
-- -------- -------- ------ l1umber -------------------------20 12
25 15 30 44 56 67 76
30 41 70 82 102
63 78 92 101 ll3 12135 46
40 63 80 108 118 128 135
45 77 108 119 129 138 144
50 86 103 116 127 136 144 148
55 93 108 121 131 140 143
60 96 111 123 132 138 138 133
65 96 llO 122 130 131 128 122
70 94 119 122 121 ll7 ll2
75 1ll 112 109 106 102
80 103 100 98 96
Number of trees obtained by div iding total basal area by basal area of average tree
l j
------------------------------r-----------
1----------1-------1--------+---
1--------+--------11---
----L-----------------------------L------
FIGURE 5
Diame ter of average tree-shylarger than 05 inch db h
DI AME TE R
200 Inches
I 40
120
0 10 20 30 40 50 60 70 eo
AGE Years
1
I
I
70
15
25
35
40
50
70
97
48
83
27
40
54
53 35
TABLE 5
Diameter of average tree-shylarger than 05 inch dbh
S ite index (feet)Age (years)
60 80 90 100 110 120
------------------------ Inches ------------------------shy
31 36 42
51 58
65 72
72 79 87
92 100
105 114
117 124
127 134
136 143
146 153
155 163
164 172
173 182
182 191
16 19 2310
28 32 36 46
20 40 44 59
51 55 60 66
30 61 66 72 78 85
71 77 90 97
80 86 93 100 108bull 89 96 103 11145 119
104 112 120 129
55 108
60 115
65
116 123 131 138
123 131 139 147
130 139 147 155
75
146middot 155 164
163 172
80 18 1 191 20o
------------------------ Years --------------------------55 56 56 49 43Merging age
1 Up to merging age Diameter of average tree = - 083 + 02045 (age) - 0001153 (age)2
0 000284 (site index) 2
- 0 0192 (site index) + + 0001103 (s ite index) (age)
Above merging age Diameter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 000091l (site index) (age)
Merging age = 675 + 13625 (site index) - 0009375 (site index)2
1
I jbull I
lmiddot j I L j
i middot
l
l t i i H )l
1 middot I
I 1 lc
lnches--------------r--------------------------
1----------+-------+---------t--
-------------------L------------------------
200
140
60 70 80
FIGURE 6
Diameter of average tree-shylarger than 55 inches dbh
DI AME T E R
middot bull1
1 20
100
80
60
40
20
0 10 20 30 40 50
AGE Yeo rs
I 52
15 53
79
45
55
70
75
TABLE 6
Diame ter of average tree-shylarger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Inches --- ----------------------55 58 62
69 72
74 79 83
88 93
93 98 103
108 114
117 124
127 134
136 143
146 153
163155
164 172
173 182
182 191
200191
I 10
49 57 61 65
20
25
30
35
40
so
60
65
57 61
65 69 74
72 77
8579
93 9987
94 101
101 108
108 116
123115
130
66 70
84
83 88
91 97 102
105 111
107 114 120
115 122 12 9
123 131 138
131 139 147
139 147 155
146 155 bull164
163 172
f 80 181t Diameter of average tree = 109 + 01057 (age) - 0 000198 (age)2
+ 00247 (si te index) + 0000911 (site index)(age)
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
1
FIGURE 4
Trees per acre--larger than 95 inches dbh
NUMBER OF TREES
ii
20 30 40 50 60 70 80
AGE ( Years
I
24 57
95
93
24 34 44
93
144
93
TABLE 4
Treesper acre--larger than 95 inches db h
Site index (feet) Age
(years) 60 70 80 90 100 llO 120
-- -------- -------- ------ l1umber -------------------------20 12
25 15 30 44 56 67 76
30 41 70 82 102
63 78 92 101 ll3 12135 46
40 63 80 108 118 128 135
45 77 108 119 129 138 144
50 86 103 116 127 136 144 148
55 93 108 121 131 140 143
60 96 111 123 132 138 138 133
65 96 llO 122 130 131 128 122
70 94 119 122 121 ll7 ll2
75 1ll 112 109 106 102
80 103 100 98 96
Number of trees obtained by div iding total basal area by basal area of average tree
l j
------------------------------r-----------
1----------1-------1--------+---
1--------+--------11---
----L-----------------------------L------
FIGURE 5
Diame ter of average tree-shylarger than 05 inch db h
DI AME TE R
200 Inches
I 40
120
0 10 20 30 40 50 60 70 eo
AGE Years
1
I
I
70
15
25
35
40
50
70
97
48
83
27
40
54
53 35
TABLE 5
Diameter of average tree-shylarger than 05 inch dbh
S ite index (feet)Age (years)
60 80 90 100 110 120
------------------------ Inches ------------------------shy
31 36 42
51 58
65 72
72 79 87
92 100
105 114
117 124
127 134
136 143
146 153
155 163
164 172
173 182
182 191
16 19 2310
28 32 36 46
20 40 44 59
51 55 60 66
30 61 66 72 78 85
71 77 90 97
80 86 93 100 108bull 89 96 103 11145 119
104 112 120 129
55 108
60 115
65
116 123 131 138
123 131 139 147
130 139 147 155
75
146middot 155 164
163 172
80 18 1 191 20o
------------------------ Years --------------------------55 56 56 49 43Merging age
1 Up to merging age Diameter of average tree = - 083 + 02045 (age) - 0001153 (age)2
0 000284 (site index) 2
- 0 0192 (site index) + + 0001103 (s ite index) (age)
Above merging age Diameter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 000091l (site index) (age)
Merging age = 675 + 13625 (site index) - 0009375 (site index)2
1
I jbull I
lmiddot j I L j
i middot
l
l t i i H )l
1 middot I
I 1 lc
lnches--------------r--------------------------
1----------+-------+---------t--
-------------------L------------------------
200
140
60 70 80
FIGURE 6
Diameter of average tree-shylarger than 55 inches dbh
DI AME T E R
middot bull1
1 20
100
80
60
40
20
0 10 20 30 40 50
AGE Yeo rs
I 52
15 53
79
45
55
70
75
TABLE 6
Diame ter of average tree-shylarger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Inches --- ----------------------55 58 62
69 72
74 79 83
88 93
93 98 103
108 114
117 124
127 134
136 143
146 153
163155
164 172
173 182
182 191
200191
I 10
49 57 61 65
20
25
30
35
40
so
60
65
57 61
65 69 74
72 77
8579
93 9987
94 101
101 108
108 116
123115
130
66 70
84
83 88
91 97 102
105 111
107 114 120
115 122 12 9
123 131 138
131 139 147
139 147 155
146 155 bull164
163 172
f 80 181t Diameter of average tree = 109 + 01057 (age) - 0 000198 (age)2
+ 00247 (si te index) + 0000911 (site index)(age)
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
I
24 57
95
93
24 34 44
93
144
93
TABLE 4
Treesper acre--larger than 95 inches db h
Site index (feet) Age
(years) 60 70 80 90 100 llO 120
-- -------- -------- ------ l1umber -------------------------20 12
25 15 30 44 56 67 76
30 41 70 82 102
63 78 92 101 ll3 12135 46
40 63 80 108 118 128 135
45 77 108 119 129 138 144
50 86 103 116 127 136 144 148
55 93 108 121 131 140 143
60 96 111 123 132 138 138 133
65 96 llO 122 130 131 128 122
70 94 119 122 121 ll7 ll2
75 1ll 112 109 106 102
80 103 100 98 96
Number of trees obtained by div iding total basal area by basal area of average tree
l j
------------------------------r-----------
1----------1-------1--------+---
1--------+--------11---
----L-----------------------------L------
FIGURE 5
Diame ter of average tree-shylarger than 05 inch db h
DI AME TE R
200 Inches
I 40
120
0 10 20 30 40 50 60 70 eo
AGE Years
1
I
I
70
15
25
35
40
50
70
97
48
83
27
40
54
53 35
TABLE 5
Diameter of average tree-shylarger than 05 inch dbh
S ite index (feet)Age (years)
60 80 90 100 110 120
------------------------ Inches ------------------------shy
31 36 42
51 58
65 72
72 79 87
92 100
105 114
117 124
127 134
136 143
146 153
155 163
164 172
173 182
182 191
16 19 2310
28 32 36 46
20 40 44 59
51 55 60 66
30 61 66 72 78 85
71 77 90 97
80 86 93 100 108bull 89 96 103 11145 119
104 112 120 129
55 108
60 115
65
116 123 131 138
123 131 139 147
130 139 147 155
75
146middot 155 164
163 172
80 18 1 191 20o
------------------------ Years --------------------------55 56 56 49 43Merging age
1 Up to merging age Diameter of average tree = - 083 + 02045 (age) - 0001153 (age)2
0 000284 (site index) 2
- 0 0192 (site index) + + 0001103 (s ite index) (age)
Above merging age Diameter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 000091l (site index) (age)
Merging age = 675 + 13625 (site index) - 0009375 (site index)2
1
I jbull I
lmiddot j I L j
i middot
l
l t i i H )l
1 middot I
I 1 lc
lnches--------------r--------------------------
1----------+-------+---------t--
-------------------L------------------------
200
140
60 70 80
FIGURE 6
Diameter of average tree-shylarger than 55 inches dbh
DI AME T E R
middot bull1
1 20
100
80
60
40
20
0 10 20 30 40 50
AGE Yeo rs
I 52
15 53
79
45
55
70
75
TABLE 6
Diame ter of average tree-shylarger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Inches --- ----------------------55 58 62
69 72
74 79 83
88 93
93 98 103
108 114
117 124
127 134
136 143
146 153
163155
164 172
173 182
182 191
200191
I 10
49 57 61 65
20
25
30
35
40
so
60
65
57 61
65 69 74
72 77
8579
93 9987
94 101
101 108
108 116
123115
130
66 70
84
83 88
91 97 102
105 111
107 114 120
115 122 12 9
123 131 138
131 139 147
139 147 155
146 155 bull164
163 172
f 80 181t Diameter of average tree = 109 + 01057 (age) - 0 000198 (age)2
+ 00247 (si te index) + 0000911 (site index)(age)
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
l j
------------------------------r-----------
1----------1-------1--------+---
1--------+--------11---
----L-----------------------------L------
FIGURE 5
Diame ter of average tree-shylarger than 05 inch db h
DI AME TE R
200 Inches
I 40
120
0 10 20 30 40 50 60 70 eo
AGE Years
1
I
I
70
15
25
35
40
50
70
97
48
83
27
40
54
53 35
TABLE 5
Diameter of average tree-shylarger than 05 inch dbh
S ite index (feet)Age (years)
60 80 90 100 110 120
------------------------ Inches ------------------------shy
31 36 42
51 58
65 72
72 79 87
92 100
105 114
117 124
127 134
136 143
146 153
155 163
164 172
173 182
182 191
16 19 2310
28 32 36 46
20 40 44 59
51 55 60 66
30 61 66 72 78 85
71 77 90 97
80 86 93 100 108bull 89 96 103 11145 119
104 112 120 129
55 108
60 115
65
116 123 131 138
123 131 139 147
130 139 147 155
75
146middot 155 164
163 172
80 18 1 191 20o
------------------------ Years --------------------------55 56 56 49 43Merging age
1 Up to merging age Diameter of average tree = - 083 + 02045 (age) - 0001153 (age)2
0 000284 (site index) 2
- 0 0192 (site index) + + 0001103 (s ite index) (age)
Above merging age Diameter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 000091l (site index) (age)
Merging age = 675 + 13625 (site index) - 0009375 (site index)2
1
I jbull I
lmiddot j I L j
i middot
l
l t i i H )l
1 middot I
I 1 lc
lnches--------------r--------------------------
1----------+-------+---------t--
-------------------L------------------------
200
140
60 70 80
FIGURE 6
Diameter of average tree-shylarger than 55 inches dbh
DI AME T E R
middot bull1
1 20
100
80
60
40
20
0 10 20 30 40 50
AGE Yeo rs
I 52
15 53
79
45
55
70
75
TABLE 6
Diame ter of average tree-shylarger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Inches --- ----------------------55 58 62
69 72
74 79 83
88 93
93 98 103
108 114
117 124
127 134
136 143
146 153
163155
164 172
173 182
182 191
200191
I 10
49 57 61 65
20
25
30
35
40
so
60
65
57 61
65 69 74
72 77
8579
93 9987
94 101
101 108
108 116
123115
130
66 70
84
83 88
91 97 102
105 111
107 114 120
115 122 12 9
123 131 138
131 139 147
139 147 155
146 155 bull164
163 172
f 80 181t Diameter of average tree = 109 + 01057 (age) - 0 000198 (age)2
+ 00247 (si te index) + 0000911 (site index)(age)
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
1
I
I
70
15
25
35
40
50
70
97
48
83
27
40
54
53 35
TABLE 5
Diameter of average tree-shylarger than 05 inch dbh
S ite index (feet)Age (years)
60 80 90 100 110 120
------------------------ Inches ------------------------shy
31 36 42
51 58
65 72
72 79 87
92 100
105 114
117 124
127 134
136 143
146 153
155 163
164 172
173 182
182 191
16 19 2310
28 32 36 46
20 40 44 59
51 55 60 66
30 61 66 72 78 85
71 77 90 97
80 86 93 100 108bull 89 96 103 11145 119
104 112 120 129
55 108
60 115
65
116 123 131 138
123 131 139 147
130 139 147 155
75
146middot 155 164
163 172
80 18 1 191 20o
------------------------ Years --------------------------55 56 56 49 43Merging age
1 Up to merging age Diameter of average tree = - 083 + 02045 (age) - 0001153 (age)2
0 000284 (site index) 2
- 0 0192 (site index) + + 0001103 (s ite index) (age)
Above merging age Diameter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 000091l (site index) (age)
Merging age = 675 + 13625 (site index) - 0009375 (site index)2
1
I jbull I
lmiddot j I L j
i middot
l
l t i i H )l
1 middot I
I 1 lc
lnches--------------r--------------------------
1----------+-------+---------t--
-------------------L------------------------
200
140
60 70 80
FIGURE 6
Diameter of average tree-shylarger than 55 inches dbh
DI AME T E R
middot bull1
1 20
100
80
60
40
20
0 10 20 30 40 50
AGE Yeo rs
I 52
15 53
79
45
55
70
75
TABLE 6
Diame ter of average tree-shylarger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Inches --- ----------------------55 58 62
69 72
74 79 83
88 93
93 98 103
108 114
117 124
127 134
136 143
146 153
163155
164 172
173 182
182 191
200191
I 10
49 57 61 65
20
25
30
35
40
so
60
65
57 61
65 69 74
72 77
8579
93 9987
94 101
101 108
108 116
123115
130
66 70
84
83 88
91 97 102
105 111
107 114 120
115 122 12 9
123 131 138
131 139 147
139 147 155
146 155 bull164
163 172
f 80 181t Diameter of average tree = 109 + 01057 (age) - 0 000198 (age)2
+ 00247 (si te index) + 0000911 (site index)(age)
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
I jbull I
lmiddot j I L j
i middot
l
l t i i H )l
1 middot I
I 1 lc
lnches--------------r--------------------------
1----------+-------+---------t--
-------------------L------------------------
200
140
60 70 80
FIGURE 6
Diameter of average tree-shylarger than 55 inches dbh
DI AME T E R
middot bull1
1 20
100
80
60
40
20
0 10 20 30 40 50
AGE Yeo rs
I 52
15 53
79
45
55
70
75
TABLE 6
Diame ter of average tree-shylarger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Inches --- ----------------------55 58 62
69 72
74 79 83
88 93
93 98 103
108 114
117 124
127 134
136 143
146 153
163155
164 172
173 182
182 191
200191
I 10
49 57 61 65
20
25
30
35
40
so
60
65
57 61
65 69 74
72 77
8579
93 9987
94 101
101 108
108 116
123115
130
66 70
84
83 88
91 97 102
105 111
107 114 120
115 122 12 9
123 131 138
131 139 147
139 147 155
146 155 bull164
163 172
f 80 181t Diameter of average tree = 109 + 01057 (age) - 0 000198 (age)2
+ 00247 (si te index) + 0000911 (site index)(age)
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
I 52
15 53
79
45
55
70
75
TABLE 6
Diame ter of average tree-shylarger than 55 inches dbh
Site index (feet) Age
(years) 60 70 80 90 100 110 120
------------------------ Inches --- ----------------------55 58 62
69 72
74 79 83
88 93
93 98 103
108 114
117 124
127 134
136 143
146 153
163155
164 172
173 182
182 191
200191
I 10
49 57 61 65
20
25
30
35
40
so
60
65
57 61
65 69 74
72 77
8579
93 9987
94 101
101 108
108 116
123115
130
66 70
84
83 88
91 97 102
105 111
107 114 120
115 122 12 9
123 131 138
131 139 147
139 147 155
146 155 bull164
163 172
f 80 181t Diameter of average tree = 109 + 01057 (age) - 0 000198 (age)2
+ 00247 (si te index) + 0000911 (site index)(age)
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
l I i I
i I
l nt It 1 1 p
-------------+--------------+--------------+------
-------------+------------+-------_-------+------
-------------+--------------+--------------+------
------4--------+------------+--------------+------
L---------------------L-------------------------
60
20
20 30 60 70
FIGURE 7
Diame ter of average tree-shylarger than 95 inches dbh
DI AMETER
180
160
140
1 20
100
80
40
0 10 40 50 so
AGE Years
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
I ---------------------- ---
70
45
50
55
75
72 54 50
TABLE 7
Diameter of average tree-shylarger than 95 inches d b h
Site index (feet)Age (years) 60 80 90 100 110 120
-------------------- ---- Inches --- -------------- - - - - - ---20 111 112 113 113
25 111 112 114 115 116 117
30 111 113 114 116 118 120 122
35 112 115 117 119 123 124 126
40 115 117 120 123 126 129 131
60
117 120 124 127 130 133 137
120 124 128 131 135 139 143
127 132 136 140 146123 153
127 131 136 141 147 155 163
65 131 164 172136 141 147 155
70 135 146 155 164 173 182
80
182 191154 163 172
161 171 181 191 200
------------------------- Years
Merging age 64 58
Up to merging age Diameter of average tree = 1133 - 00668 (age) +
- 0010l (site index) 0000705 (age)2
+ 0000950 (si te index) (age) Above merging age
Diame ter of average tree = 109 + 01057 (age) - 0000198 (age)2
+ 00247 (site index) + 0000911 (si te index) (age)
Merging age = 1735 - 1775(si te index) + 000625 (si e index)2
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
1
11
------+--------------r-------+-------4--------r-------1
------+-------4--------r-------+------_------r-------
------+-------4--------------+-------4------r-------1
L--------------------L------------------------
40
FIGURE 8
Basa l area per acre--trees larger than 05 inch dbh
B AS AL ARE A
60
20
0 10 20 30 40 50 60 70
AGE ( Years
l a
80
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
Sguare
I
35
40
45
50
55
65
70
75
94
97
99
98
174
177
45 45
TABLE 8
Basal area per acre--trees larger than 05 inch dbh
Site index (feet)Age (years)
60 70 80 90 100 llO 120
---------------------- feet --- -------------------10 69 71 73 76 78 80 82
15 78 82 85 88 92 95
103 10720 80 85 89
86 9 1 97 103 108 ll4 1 19 25
104 l l l 118 124 131 30 91
103 111 1 19 127 135 14295
108 117 127 136 144 153
114 126 137 147 156 164103
60
107 120 134 146 157 167 175
125 140 153 165 175 184llO
129 144 158 171 182 192113
130 146 161 187 197
190 201 147 162 177
191 20316275
80 175 190 203
------------------------- Years ------------------------shy
Merging age 5 1 41 40 41
Up to merging age 0 006620(age)2Basa l area= 5616 - + 0022465 (site index)(age)
Above merging age -Basal area = - 11195 + 38354 (age) 0037466 (age)2 + 15606 (site index)
- 0006747 (site index)2 +middot0016438 (si te index) (age)
Merging age = 1650 25 (si te index) + OO l25 (site index)2 -
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
r--------r------r-------
r--------r-----1---
r--- --r----- r--------r------ -------_ _____ --------- 1
--------------------------------------------
160
80
FIGURE 9
Basal area per acre--trees larger than 55 inches d bh
B AS AL ARE A
140
20
0 10 20 30 40 50 60 70
AGE Years
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
TABLE 9
Basal area per acre--trees larger than 5 5 inches db h
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
J------+----+----+-----1-
-----+----+----+--
0 L_ ___ L_ ___ L_ ___ J_ ___ ---------L---
FIGURE 10
Basal area per acre--trees larger than 95 inches dbh
B AS AL ARE A
180
160
10 20 30 40 50 60 70 80
AGE Years
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
Sguare
I ---- ------ - - - - - - - - ------- ----------- - -------------
70
30
35
40
70
75
57
93
45
75
90
95
89
149
70
TABLE 10
Basal area per acre--trees larger than 95 inches dbh
Site index (feet)Age (years)
60 80 90 100 1 10 120
--------- - - - - - - ------- feet ----------------------20 8 16 24 3 1
25 21 3 1 40 49 57
16 41 52 63 73 82
32 59 71 83
45 60 102 1 15
45 74 105 120 134 147
86 103 119 135 15150 68
96 114 55 77 132 166
60 84 104 124 143 162 180 192
187 19765 89 111 132 153 173
80
139 160 177 190 201
143 162 177 191 203
142 159 175 190 203
75Merging age 65
Up to merging age 0033070 (age)2-Basal area = 15064 + 36498 (age) shy
+ 08356 (site index) - 000291l (site index)2
+ 0026337(site index) (age)
Above merging age Basal area= - 11195 + 38354 (age) - 0 037466 (age)2
+ 15606 (s ite index) - 0006747 (site index)2
+ 0016438 (site index) (age)
Merging age = 1200 - OS(site index)
106
127
166
182
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
I I middot gti i
i middotr i j - middot4
iY H l t
------+-----+-----+----+ 8100
3600
900
80
FIGURE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
V OLUME
10800 Cubic Feet
2700
1800
0 10 20 30 40 50 60 70
AGE Years
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
1 r----------
I
Age (years)
10
15
30
35
40
45
55
60
80
7680
470
TABLE 11
Cubic-foot volume per acre--trees larger than 55 inches dbh
S ite index (feet)
60 70 90 100 110 120
---------------------- Cubic feet ----------------------shy
120 240 350
260 470 680 900 1 110 1320 1530
700 1010 1320 1620 1930 2240 254020
25 1100 1500 1900 2300 2700 3100 3500
1440 1940 2430 2930 3420 3920 4410
1740 2320 2910 3500 4090 4680 5270
1980 2660 3350 4030 4 720 5400 6080 -
2170 2950 3730 4510 5290 6070 6840
so 2320 3190 4060 4940 5810 6680 7560
2410 82203380 4350 5320 6280 7250
2460 3520 4580 5640 6 710 7 770 8830
65 8240 93903610 4770 5 92() 7080
70 4900 6150 7400 8650 9900
75 6330 9020 10360
80 7900 9340 10780
Cubic feet - 94913 + 104598 (age) - 0996486 (age)2 - 7068l (site index) + 18869ll (site index)(age)
Tree volume is for stem to a 4shy inch top d i b stump excluded Table 93 Volume Tables for Pacif ic Northwest Trees comp iled by F Johnson US Dept Agr Handb 92 122 tables 1955 )
(From A
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
J r
FIGURE 12
Cubic-foot volume per acre--trees larger than 95 inches db h
VOLUME
10800 Cubic Feet
4800
3600
20 30 40 50 60 70 so
AGE ( Years
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
I
1
I
I
I ------------------------- ------------ - - -----------
60 80
20
25
30
35
40
45
so
60
75
80
430
so 440
570
560 820
820
9340
75 60
TABLE 12
Cubic-foot volume per acre--trees larger than 95 inches dbh
Si te index (feet) Age (years)
70 90 100 110 120
---- - ---------- ------- Cubic feet ----------- -- - ---------30 300
1200 1580 1960
2060 2560 3060107070 1560
1040 1660 2270 2880 3500 4 110
740 1470 2200 2940 3660 4400 5130
1020 1870 2 710 3560 4410 5250 6 100
1250 2220 3 180 4140 5110 6070 7030
55 1450 2530 3610 4690 5 770 6850 7920
1600 2800 3990 5190 6390 7580 8830
65 1 710 3030 4340 5650 6960 8240 9390
70 1790 3220 4640 6070 7400 8650 9900
3360 4910 6330 7680 9020 10360
7900 10780
70 65Merging age
Up to merging age Cubic feet= - 171181 - 1S7088 (age) - 0811366 (age)2
- 20 118l (site index) + 2328763 (site index) (age)
Above merging age Cubic feet= - 94913 + 104598 (age) - 0996486 (age)2
- 7068l (site index) + 18869ll (site index) (age)
Tree volume is for stem to a 4-inch top di b stump excluded (From Table 93 Volume Tables for Pacific Northwest Trees 11 compiled by F A Johnson US Dept Agr Handb 92 122 tables 1955)
Merging age= 1200 - OS (site index)
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
middot
1------+------l-------J-
1-------1-------1----
FIGURE 13
Board-foo t volume per acre (Scribner rule)-shytrees larger than 95 inches dbh
V OLUME
72000 Board Feet
43200
36000
20 30 40 50 60 70
AGE ( Years
80
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
- -
- -
- -- -
95
----------------------
25
65
75
65
TABLE 13
Board-foot volume per (Scribner rule)-shyacre trees larger than inches dbh
Site index (feet)Age (years) 60 70 80 90 100 110 120
-Board feet ------- ---- ----------shy
20 100 1200 2400 3500
1800 3500 5200 6900 8800
30 300 4600 6800 920( 11700 14300 35 1800 4500 7300 10300 13400 16600 20000 40 3200 6500 10000 13700 17600 21 700 26000 45 4500 8400 12700 17100 21900 26900 32100
8200 15 100 22500 30600 39200 48100 56800
50 5600 10300 15300 20600 26200 32100 38400
55 6600 12000 17800 24000 30500 37500 44800 60 7500 13600 20200 27300 34900 42 900 51700
70 8700 24 700 3380( 42800 52100 61900
26800 36100 45700 55900 66800
80 28100 37800 48300 59600 71600
------------------------- Years ----------- -- -----------shy
Merging age 75 70
Up to merging age Board feet 596407 700932 (site index) =
- age(54 7306 - 7550025 (site index) + 0006623 (site index)2J - age2[2826865
-- age3[o000267 (si te index)]
Above merging age Board feet= 330685 246260 (site index)
+ 0005172 (site index) 0000767 (site index)2]
+ age[364429 + 626167l (site index) 0002327 (site index)2] age2[3471836 0003444 (site index) 000062l (site index)2 ]
- age3[0000328 (site index))
Tree volume is for s temmiddotto an 8-inch top dib s tump excluded Logs scaled in 8-foot lengths (From Table 97 Volume Tables for Pacific Northshywes t Trees compiled by F A Johnson US Dep t Agr Handb 92 122 tables 1955)
Merging age = 1200 - 05 (site index)
GPO 994842
60
