30 
BULLETIN 1291, U. S. DEPARTMENT OF AGRICULTURE 
Table 18. — Mean annual increment per acre of aspen in different classes of 
products 
SITE 1 
Age 
Total 
volume 
Cord- 
wood 
Mine 
props 
Saw 
timber 
Cubic 
feet* 
10.0 
33.7 
45.0 
50.0 
50.7 
50.6 
50.0 
48.5 
46.3 
44.5 
Cubic 
feeti 
Linear 
feeti 
Board 
feeti 
40 years . . 
21.2 
31.0 
36.6 
39.2 
40.6 
40.0 
40.0 
39.0 
38.3 
68 
103 
124 
134 
119 
90 
55 
35 
12.0 
43.3 
68.5 
85.0 
100.0 
110.0 
120.0 
128.3 
60 years . . . _ . . _ . 
80 years . . 
90 years _ . . .._--_. 
100 years.. _ . 
110 years 
120 years .. 
130years 
43.0 
42.5 
40.6 
37.6 
36.7 
36.0 
21 
13 
7 
133.8 
140.0 
144.0 
140 years 
150 years 
SITE 2 
40 years. 
50 years. 
60 years . 
70 years. 
80 years. 
90 years . 
100 years 
110 years 
120 years 
130 years 
140 years 
12.5 
27.0 
35.0 
39.2 
40.6 
40.5 
40.0 
39.0 
37.9 
36.5 
35.0 
3.2 
15.0 
21.6 
25.0 
27.5 
28.8 
29.0 
29.0 
28.3 
28.0 
27.5 
SITE 3 
SITE 4 
58 
93 
106 
105 
80 
41 
10.0 
28.5 
42.5 
53.3 
62.0 
69.0 
75.0 
80.0 
82.8 
50 years 
60 years . 
10.0 
21.6 
27.8 
31.2 
32.7 
33.0 
4.0 
9.1 
13.5 
15.6 
17.7 
18.5 
10 
57 
80 
88 
53 
70 years . . ... 
2.1 
12.5 
17.7 
22.0 
100 years . 
HOyears . 
32.7 
32.0 
31.1 
19.0 
19.1 
19. 2 
22 
10 
3 
25.4 
30.0 
32.3 
120 years. .. 
130 years 
60 years . _ 
6.6 
14.2 
20.0 
0.8 
5.7 
9.4 
! 
25 
50 
80 years . 
2.5 
90 years 
100 vears 
22.7 
24.0 
24.5 
24.5 
11.6 
13.0 
14.0 
14.1 
39 
18 
6 
1 
3.3 
4.0 
5.4 
6.6 
110 years. .. 
120years 
1 See footnote, Table 17, for sizes of materials included. The line across the table shows the probable 
pathological rotation. (Determined by Dr. E. P. Meinecke for site 2, and estimated for other sites.) 
Tables 17 and 18 show the whole life history of aspen stands on 
sites 1 to 4, and indicate the great variability of development on these 
four sites. These tables are the result of specific observations, and 
the curves were necessarily made independently of each other and 
upon a slender basis at times. A close inspection will show discrep- 
ancies, but these are unavoidable in tables built up in this manner. 
