Trees per Acre

Ave

rag

e V

olu

me

pe

r T

ree

(ft

3 )

8"

30'

80'

60'

50'

70'

40'

20'

15'

11"

9"

7"

12"

5"

2"

3"

4"

10"

Quadratic Mean dbh (in)

Top Height (ft)

Max

imum

Den

sity

Lin

e (R

D=

1.0)

Avg

-Sta

nd T

raje

ctor

y (R

D=

0.67

)

crown closure

6"

20000200 300 500 2000 3000 5000

30

20

7

5

3

1

0.7

0.5

0.3

0.1

0.05

1000

10

10000

2

0.2

Equations:

Avg-stand trajectory (RD = 0.67)

V = 20,597 TPA –1.2149

TPA = [V / 20,597] (-0.8231)

Maximum Density Line (RD = 1.0)

V = 33,281 TPA –1.2149

TPA = [V / 33,281] (-0.8231)

Eastern Spruce-fir Density Management Diagram

12

15

17.5

25