EFFECT OF GBAZING UPON ASPEN EEPKODUCTION. 
13 
90000 
80000 
70000 
60000 
"J soooo 
< 
1 
•I 
& 40000 
30000 
20000 
10000 
1 
i 
I 
! 
; 
/\ 
\ \ 
\ \ 
\ \ 
\ \ 
\ \ 
\ \ 
\ \ 
\ V 
\ \ 
\ \ 
\ \ 
\ \ 
\ \ 
v \ 
Y \ 
\ 
\ 
\ \ 
\ \ 
\ \ 
\ 
\ 
\ 
\ 
\ 
\ 
\ 
\ 
\ 
\ 
\ 
\ 
\ 
\ 
'"•A 
\ 
\ 
^--•"~~ 
\ 
\ 
N 
fega^. 
s^SS^ 
Fall Summer Fall Summer Fall 
1913 1914 1914 1915 1915 
Summer Fall 
1916 1916 
Total Number Of Sprouts Per Acre 
Uninjured Sprouts 
Injured By Barkinq 
— Killed By Barking 
Injured By Frost 
Killed By Frost 
Fig. 3.— Number of sprouts per acre on clear-cut plots and their injury and mortality due to 
than grazing. (Area fenced .) 
causes other 
