June 15, 1925 
Natural Reproduction after Fires 
1187 
dispersion of seed from four such seed 
groups, which appear as a, b, c, and d 
on the map, Figure 1, and also in 
Table IV. 
Group A is a high and very prominent 
group and is shown on the elevation in 
the background of Plate 3, A. The 
greatest number of trees in the group 
are western larch, but there are also a 
few live Douglas firs, alpine firs, and 
white pines. Briefly, restocking to 
the north of the seed group is only 
one-third complete and to the south and 
west is also insufficient. 
The distances to which seed is dis¬ 
persed are from 9 to 11 chains on the 
north to 5 to 6 on the south side of the 
seed trees. The dispersion for the 
greater distance in the northerly direc¬ 
tion evidently is promoted by the pre¬ 
vailing wind and a more favorable 
aspect. White pine and Douglas fir 
seeded to a distance of 9 chains from 
the parent trees and white fir and west¬ 
ern larch to 11 chains. Restocking in 
the northerly direction is also more 
regular than toward the south, in that 
it shows a gradual falling off in numbers 
Table IV.— Effective seed dispersion from, groups of live trees, double burns of 1910 
and 1919, 1928 » 
Seed-tree Group A 
NW. strip NE. strip SE. strip SW. strip 
Seed-tree Group B * 1 
NE. strip NW. strip 
Western white pine. 
White fir. 
Western larch. 
Douglas fir. 
Western hemlock... 
Lodgepole pine. 
Alpine fir. 
Total. 
Western white pine. 
Seed-tree Group 0 < 
NW. strip SE. strip 
Seed-tree Group D 
NE. strip NW. strip SE. strip 
Western white pine. 
White fir. 
Western larch.. 
Douglas fir__ 
Western hemlock... 
Western white pine. 
3.4 
7.5 
• Slope varied for the different seed-tree groups and strips, as follows: Group A—NW. strip 25 to 50 per 
cent, NE. strip 25 to 30 per cent, SE. strip 20 to 30 per cent, SW. strip 30 to 55 per cent; Group B—30 to 
50 per cent; Group C—NW. strip 10 to 25 per cent, SE. strip 25 to 35 per cent; Group D—NE. strip 30 
to 50 per cent, NW. strip 20 to 35 per cent, SE. strip 0 to 20 per cent. 
1 No seedlings on southeast or southwest strips. 
• No seedlings on northeast strip. 
