EFFECT OF CUTTING UPON REPRODUCTION. 



25 



absence of reproduction directly beneath the crown, even where the 

 seed bed is favorable, is attributed to adverse moisture conditions. 

 However, such can not be the case in this type, since spruce seed- 

 lings are invariably found directly under the mother tree. In com- 

 paring the counts for 1910 and 1911 it was seen that a very large 

 percentage of the seedlings of all species die during their first year 

 of growth. This loss decreases with an increase in age. It is evident 

 from these counts that yellow-pine seedlings will germinate but not 

 grow for any length of time in direct sunlight. 



Table 11 shows the number of living seedlings and the percentage 

 of loss in each age class during the year 1910-11 for Reproduction 



Plot 1. 



Table 11. — Seedling counts on Reproduction Plot 1. 



Age.i 



Number of living seedlings. 



Western yellow pine. 



Douglas fir. 



Blue spruce- 



First 

 count 

 (1910). 



Second 

 count 

 (1911). 



Loss. 



First 

 count 

 (1910). 



Second 

 count 

 (1911). 



Loss. 



First 

 count 

 (1910). 



Second 

 count 

 (1911). 



Loss. 



Years. 

 1 



360 

 1 

 5 



14 

 6 



4 



17 



1 

 3 

 10 

 6 



4 



Per ct. 

 95.2 



"io.'o" 



28.5 



147 

 3 

 17 

 35 



21 



20 



2 

 1 



11 

 16 

 9 



18 



Per ct. 

 98.6 

 66.6 

 35.3 

 54.3 

 57.1 



10.0 



13 

 1 

 2 

 2 

 3 



27 



1 

 1 

 1 

 1 



2 



27 



Per ct. 

 92.3 



"50." 6" 

 50.0 

 33.0 



71.4 



2 



3 



4 



5 



1 inch high and 



Total loss in seed- 

 lings 1 to 5 years 

 old 







90.4 







82.5 





















Refers to age at time of first count. 



REPRODUCTION PLOT 2, 



This plot comprises an area of 6,000 square feet, and is located 

 within a cutting plot in a medium dense stand on a gentle southerly 

 slope. Large trees of all species are evenly distributed over the 

 area. The altitude is approximately the same as for plot 1. The 

 soil is a black loam of good depth, and supports a medium stand of 

 mountain bunch grass. The area is comparatively free from rocks. 

 Like plot 1, humus and litter are present only under the large trees 

 and around stumps. After the cutting was made the average light 

 intensity at five stations on the plot was found to be 0.277. 



The cutting system was the same as for plot 1. Inasmuch as 

 there were a number of saplings and poles on the area, but few 

 standards were left for the production of seed. One is within the 

 reproduction plot. 



It was noticed here, as in plot 1, that few seedlings germinate and 

 grow in the litter and humus around the base of large trees. Table 

 12 gives for the year 1910-11 the number of living seedlings and the 



