oct. i, 19x7 Reproduction from Seed Stored in the Forest Floor 
13 
AREAS, PART OF WHICH ARE SINGLE BURNS AND PART REPEATED BURNS 
The studies of the Columbia bum in 1913 established the fact that 
most of the reproduction which follows a single burn is due to seed 
which was stored in the forest floor before the fire and which retained 
its viability through the fire. Very often, however, burned areas are 
again burned, and the second fire creates many complications of the 
factors which influence reproduction subsequent to a single burn. In 
order to find out the reason for the presence or absence of reproduction 
following repeated burns, areas on the Rainer National Forest burned 
over in 1864, 1874, 1892, 1902, and 1910 were studied. 
Cowlitz burn. —The Cowlitz area was burned in 1902, and the north¬ 
eastern part was reburned in 1910. The original forest consisted of 
Douglas fir, noble fir, western red cedar, western hemlock, and western 
white pine. 
The most striking feature of this burn is the fairly uniform distribu¬ 
tion of reproduction of all age classes and species on the portion of the 
area burned only once, as shown by Table IV. 
Table IV .—Classification of young growth on Cowlitz area after the burn of IQ 02 
Species. 
Distance from 
seed trees. 
Per¬ 
centage 
of total 
area 
exam¬ 
ined in¬ 
cluded 
in each 
dis¬ 
tance. 
Percentage of total 
number of seedlings 
found within each 
distance. 
Over 1 
years. 
6-10 
years. 
o-S 
years. 
Grand total percentage 
of all seedlings found. 
Over 10 
years, 
6-10 
years. 
0-5 
years. 
Douglas fir.. 
Western white pine, 
Noble fir 
Western hemlock 
Western red cedar. 
Chains. 
Over 10... 
6-10. 
£-5. 
Over 10... 
6-10. 
°-5. 
Over 10... 
6-10. 
?-5. 
Over 10.. 
6-10. 
0-5. 
{ Over 10.. 
6-10. 
o-5. 
37- 5 
5 2 * 9 
9.6 
100 
16. 5 
19. 6 
24. 2 
4. S 
45- 5 
45-3 
36.3 
67. o 
36. 2 
57- 2 
6.6 
36. 2 
53. 1 
5- 7 
5°- 5 
42. 9 
6.6 
33*3 
40. o 
20. o 
18.7 
19. 2 
10. 5 
23*4 
22. 2 
7*4 
40.9 
36. 1 
40. o 
34* 7 
20. o 
30. 7 
53*2 
49* 1 
27. 8 
38. o 
35* 1 
39* 5 
28. 2 
25. 8 
23*9 
40. o 
46. 6 
60.8 
58.8 
23*4 
28. 7 
64. 8 
jss- 
4.8 
} 37 - 
7 
17. 6 
20. 8 
56.8 
67. o 
37-4 
26. 3 
47*4 
8. 1 
28. 2 
24.9 
56. 1 
31.8 
a Total area examined «- 5.15 acres. 
The uniformity of distribution of each age class and the large per¬ 
centages of the o-to-5 and 6-to-io-year-age classes seemed at first to 
indicate restocking by the remaining seed trees after the fire. White 
pine snags were found on the burned area, and green white-pine trees 
were found in canyons and at elevations varying from 300 to 400 feet 
