Upload
others
View
3
Download
0
Embed Size (px)
Citation preview
1
COPPICE SILVICULTURE:COPPICE SILVICULTURE:SOME ALTERNATIVES AND APPLICATIONSSOME ALTERNATIVES AND APPLICATIONS
Ralph D. NylandDepartment of Forest and Natural Resources Management
SUNY College of Environmental Scienceand Forestry
Syracuse, NY 13210
Nyland – 2009
All rights reservedUse of all or parts of these class notes prohibited
without express consent of Ralph D. Nyland
Background reading:
Chapter 9, in Nyland, R.D. 2002. Silviculture: Concepts and Applications. Waveland Press. Long Grove. IL. 2ed.
Sources cited:
Aldrich 1963
ArborGen, LCC. 2009. FlexStand System Guide. ArborGen LCC, Summerville SC.
Christersson, L., L. Sennerby-Forsse, and L. Zsuffa. 1993. The role and significance of woody biomass plantations in Swedish agriculture. For. Chron, 69(6):687-693.
Fowells, H.A. 1965. Silvics of Forest Trees of the United States. US For. Serv. Agric Handbk. 271.
Hammill and Moran 1986
Hawley, R.C. 1937. The Practice of Silviculture. John Wiley & Sons, Inc. NY. 3ed.
Hawley, R.C., and D.M. Smith 1954. The Practice of Silviculture. Wiley. NY. 6ed.
Matthews, J.D. 1991. Silvicultural systems. Oxford Univ. Press., Oxford.
Patton, D.R. 1992. Wildlife Habitat Relationships in Forested Ecosystems. Timber Press. Portland, OR.
Porter, W.F. 1987. Integrating wildlife management with even-aged timber systems. Pp. 319-337. in Managing Northern Hardwoods. R.D. Nyland, (Ed.). SUNY Coll. Environ. Sci,. and For., Fac. For. Misc. Publ No. 13 (ESF 87-02) Soc. Sm. For. Publ. No. 87-03.
2
Aspen silviculture …
…with attention to wildlife (grouse) habitat management
Consider an example …
Natural ranges foraspen and ruffed grouse overlap …
3
… feeding on catkinsand buds
US Forest Service
Grouse benefit fromaspen stands at differentstages of development …
… and using dense stands for cover and other life essentials
4
… also, aspen stands mayhave high volumes ofgood fiber suitable to many uses
… and we can regenerate them over large areas readily by coppice methods
5
But note this …
- while good sites produce high volumes
- poor sites and overmature stands havelimited commodity potential
Overmature and decadent poor for commodities …
… also not necessarily great for ruffed grouse
6
Best conditions for grouse ...
So what agefor 5000/acre
This stand has high potential as grouse habitat ...
7
What agefor 20 feet tall
6 ft
12 ft
18 ft
8
Note this …
… how habitat quality shifts with stand age
Porter 1987
... about half a century
9
Also an interspersion of condition classes best …
Porter 1987 … with different conditions in close proximity
… interspersion of requisite conditions over space and time
10
And close proximity means …
… within 500 feet
Not a goalwith aspen ≤ 500 ft
... a balance of ageclasses across the landscape
Adapted from Patton 1992
11
Stacy McNulty 2000 ... establishing different age classes in close proximity
… but not likely to this extreme
12
… probably more like this
... well suited to mechanized harvesting
13
... and fiber production goals
US Forest Service… clearfelling the copse to establish a new age class
14
US Forest Service
… relying on root suckers to restock the stand
US Forest Service
… with this outcome (after 11 years)
15
… but how to know when to call a stand mature
The culmination of m.a.i.
16
Porter 1986
A reasonable match …
... within the maximumtargeted time
Peak m.a.i.
... melding fiber production using coppicemethods, with maintenance of goodhabitat for ruffed grouse
17
Now back to a consideration of coppice silviculture …
… in general
… as well as making it suitable for coppicingaspen with wildlife habitat management
Coppice system advantages …
SIMPLE …
- certain regeneration- high level volume production- short rotations, with quick payoffs
(e.g., volume and grouse with aspen)- cutting area any size and shape- species composition predictable- few health risks with short rotations
18
A good scheme forfiber production …
… and grouse habitatmanagement
Coppice system disadvantages …
- small diameter products (mostly)
- useful with few species (hardwoods)
- frequent site disturbance with short rotations
- yields little sawtimber
- aesthetically unpleasant (the reproduction method)
- grazing / browsing must be excluded
- shoots arising after late summer cutting susceptible
to frost damage
19
... and if by sprouting, you must deal with the clumps
Consider an alternative …
20
Coppice with standards …
… selected trees (perhaps of seed origin)left to grow to large size
Consider an alternative …
… keep selected trees at uniform and wide spacing
STANDARD STANDARD STANDARD
START
An alternative …
21
Coppice with standards …
… selected trees (perhaps of seed origin)left to grow to large size
… with coppice growth maintainedbeneath them
… leaving only the standards
Like this after the cutting …… then coppice the rest
22
STANDARD STANDARD STANDARD
START
An alternative …Leading to a 2-aged stand
… as the coppice shoots develop
From: Matthews 1991
.. or like this with oaks
23
… coppice withstandards
… in aspen
… a two-aged stand
24
CUT ALL EXCEPT SELECTED NEW STANDARDS
Second entry …
… as a new age class develops by coppice growth
STANDARD STANDARD STANDARD
Same process repeated through time…
… perhaps implemented assuggested by ArgorGenwith its FlexStand strategy
Or as a new approach for coppice-with-standards …
ArborGen FlexStand Schematic
(Standard)(Coppice)
ArborGen 2009
25
… something like this
… repeated indefinitely
From Hawley 1935To get this …
Or have standards of multiple ages …
… go first to coppice with standards
… each time keeping some of the old standards,plus adding new standards from the understory growth
26
Called COMPOUND COPPICECOMPOUND COPPICE …
… producing an uneven-aged stand
An alternative …
COMPOUND COPPICE
27
Hawley and Smith 1954 … like this from above
Coppice with standards …
Silvicultural requirement (historic) …
- the STANDARDS should be fast-growing species… may mean shade-intolerant ones
- the coppice UNDERWOOD may need to be at least moderately shade tolerant
28
Or …
... like this toimprove lightin the understory
Or …
… keep the standards at only
rather wide spacing
29
To increase the number of standards …
- retain existing standards as a seed source
… if old enough to produce seed
- clean to keep young potential standards free to grow
- beat up the stand (reinforcement planting)
… but plant large seedlings as a wide spacing
- thin selected coppice clumps to a single stem
… and keep the favored sprout for multiple
rotations as a seed source
... periodically establishingsome new trees to becomefuture standards
30
... or deciding how to convert sprout clumps to single-stem standardsfor the future
… or with some speciesjust accepting a fewsprout clumps oflow origin
Now an entirely different kind of coppice system …
…… for BIOMASS PRODUCTIONfor BIOMASS PRODUCTION
31
Christersson et al. 1993
Note the advantage of willow …
… as a mini-rotation biomass crop
When planted at close spacing …
... and managed for mini-rotation periods
32
T.A. Volk
... started fromunrooted cuttings
33
Swedish double-row planting method …D. Robison
... with the shrub willows producingmultiple vigorous sprouts after the1st-year cutting
Coppiced after the firstyear to promote vigoroussprouting from the stools …
34
... like this
... and rapid growth
35
… regenerating the copse at the culmination of m.a.i. for biomassNissen 2001
But when to end the rotation ...
… with a harvester like this one
36
The cutter head …
Producing chips like this for biofuels …
37
... and cuttinglow stools
... they will sprout again for another rotation
38
... providing repeated crops at short rotations
... woody biomass(at least 10 dry tons/ac/yr)
39
… if it had antlers, I’d do something
After Nissen 2010
Should we clone it …