Nov. 15, 1925 
Preliminary Study of Growth of Noble Fir 
933 
Table III. — Average number of years required for noble fir seedlings to attain 
various heights, Larch Mountain, Oreg., 8,800 feet elevation 
Height 
Age 
Height 
Age 
Height 
Age 
Height 
Age 
Feel 
0.5_.___ 
Years . 
2 
3 
5 
6 
Feet 
2.5__ 
Years 
7 
8 
9 
10 
Feet 
4.5_ 
Years 
11 
11 
12 
13 
Feet 
6.5_ 
Years 
14 
14 
15 
16 
1.0 ___ 
3.0_ 
5.0_ 
7.0_ 
1.5... 
3.5. 
5.5.. 
7.5__ 
2.0 _ 
4.0. 
6.0 . 
8.0 . 
YIELD 
Table IV gives the average contents per acre of standing trees of 
different species, no reduction being made for defect or breakage, 
for two plots differing essentially in the number of dominant trees 
forming the stand. Table V gives the average contents for 17% 
acres. 
Table IV. — Average number of trees, average diameter, and average volume, by 
tree classes and species ° 
Plot and species 
Domi¬ 
nant trees 
per acre 
Diameter 
of aver¬ 
age dom¬ 
inants 
Total 
volume 
of domi¬ 
nants per 
acre 
Sup¬ 
pressed 
trees 12 
inches 
and more 
in diam¬ 
eter per 
acre 
Volume 
of sup¬ 
pressed 
trees per 
acre 
Total 
trees per 
acre with 
breast- 
height 
diameter 
of 12 
inches 
or more 
Total 
volume 
of all 
trees per 
acre 
Plot 1—4 acres: 
Noble fir__ 
Number 
8.50 
4.25 
12.25 
.75 
Inches 
45.6 
42.1 
42.6 
48.8 
Bd.ft. 
51,887 
16,892 
41, 111 
2,327 
Number 
1.00 
20.25 
1.50 
.75 
Bd.ft. 
1,125 
13,922 
1,892 
384 
Number 
9.50 
24.50 
13.75 
1.50 
Bd.ft. 
53,012 
30,814 
43,003 
2,711 
Western hemlock_ 
Douglas fir__ 
Red cedar_ 
Total__ 
25.75 
112,217 
23.50 
17,323 
49.25 
129,540 
A vftrapfi 
43.7 
Plot 2—3 acres. 
Noble fir_ 
8.33 
3.33 
4.00 
55.0 
44.1 
48.5 
79,667 
14,821 
19,508 
1.33 
30.66 
.66 
.33 
536 
39,594 
1,127 
267 
9.66 
34.00 
4.66 
.33 
80,203 
54,415 
20,635 
267 
Western hemlock_ 
Douglas fir_ 
Amahilis fir _ _ _ 
Total.. 
15.66 
113,966 
33.00 
41,524 
48.65 
155,520 
A v^ragfi 
51.2 
a Under “dominants” are included both dominants and codominants in the principal stand. 
Table V.— Average yield per acre of mature noble fir, Douglas fir, and western 
hemlock, on Larch Mountain, Oreg. a 
Species 
Trees 
per acre 
Basal 
area 
Diam¬ 
eter of 
average 
tree 
Yield 
per acre 
Noble fir - _ _ 
Number 
10 
7 
40 
Sq.ft. 
127 
66 
146 
Inches 
47.6 
42.0 
25.9 
Bd. ft. 
69,415 
22,268 
49,427 
Douglas fir _ _ 
Western hemlock _ _ ______ 
All f?pfteip.s _ . _ _ _ 
57 
339 
30.4 
141,110 
° Averages for \7% acres. Data are for trees 12 inches or more in diameter at breast height. Noble 
fir is utilized to a top diameter of 15 inches inside the bark; Douglas fir to 10 inches inside the bark; and 
hemlock to 8 inches inside the bark. 
74780—26f-3 
