Apr.1,1927 Natural Replacement of Blight-Killed Chestnut 637 
removed some material other than the chestnut also reduced the grow- 
ing stock to some extent. Plots 321 and 323 have shown a slight 
increase in basal area since 1916 in spite of the fact that a slight de- 
crease in number of trees occurred. It is not surprising to find 
stands in which the basal area is still decreasing, even though the 
number of trees may be increasing. This is well illustrated by 
plot 4, in which the death of a small number of large chestnuts more 
140 
K BS 
130 
x x 
& 120 <a 
110 x 
—S 
< 8100 = L— —— 
| XN =) 
NS 90k aan saa as {>4 ee 
XW 80 NoxXox 7 Se 
. s 
& S70 t+ BeAr, KOn 
N N 60 aa Se ED eas 535 SS Ned 4, 
RX Sk. See 
Bf 50 io ore se 
XS 40 Sa a was —S 
N 30 : 2 — 
NS Sag 
NS 20 
10 
) 
1906 1910 1915 1920 1924 
Fic. 5.—Progressive change in basal area per acre (1906-1924), due mainly to heavy mortality 
in chestnut between 1911 and 1916 
than offset the gain in basal area of a large number of small trees 
which had just entered the measurable size class. 
In order to generalize the results from these plots and bring out 
the significant changes caused by the chestnut blight, the data for 
all have been combined on an acre basis in Table 1, which summarizes 
TasBLe 1.—Average number of live trees and average basal areas per acre for the 
dominant stands 4 
1910-11 1924 
Species 
Trees per acre Basal area Trees per acre Basal area 
Per | Square| Per Per | Square| Per 
Number| cent feet cent |Number| cent Seet cent 
153.3 70.5 | 64.18 76.2 0 0 0 0 
Red oak. 22.0 10.1 9. 13 10.8 38.0 28.6 | 16.45 42.2 
Chestnut 22.0 10.1 5, 25 6.2 52.7 39.7 | 14.48 37.2 
White oak _ 9.4 4.4 1.97 2.3 9.4 71 2.07 5.3 
Black oak. 2.0 9 - 82 1.0 3.3 2.5 +94 2.4 
Scarlet oak. _. _ 8.0 3.7 2.75 3.3 5.3 4.0 3.31 8.5 
Sweet birch __ e mr 3 .13 2 0 0 0 
Red maple_____.......---.----------- 0 0 0 0 8.7 6.6 82 2.1 
Wihitelash 2 22220 o cols totodesee 0 0 0 0 6.7 5.0 .382 8 
OO sa otc tra Geass celcndercsmsanccinvesad 0 0 0 0 6.0 4.5 29 8 
Sugar maple.__.__._____.-----.------ 0 0 0 0 27 2.0 . 26 ah 
Pot dliswee rae escieteiee couse 217.4 | 100.0 | 84. 23 | 100.0 | 132.8 | 100.0 | 38. 94 | 100.0 
« Includes dominaut and codominant trees on permanent sample plots 321, 323, 474, 475, 2, and 4. Basal 
or cross-sectional area measured at 4.5 feet above ground. 
