Figure 4. — Stocking percent 

 and number of trees per 

 acre ("most desirable" 

 species only) 6 years 

 after treatment. 



100 



u 

 o 

 I- 



5.000 



4,000 



u 

 < 



IT 



3,000 Hi 



Q. 

 U) 

 UJ 

 LU 

 C 



2,000 



UJ 

 CO 



1,000 



CONTROL BURN 



SCARIFICATION 



comparison to others, most timber managers prefer to use regeneration measures that 

 tend to discourage them as major components, but accept them as minor components of new 

 stands (LeBarron and Jemison 1953, Smith 1955, Day and Duffy 1963). With these two 

 considerations in mind, an analysis was made in which the spruce, larch, Douglas-fir 

 and grand fir were selected as the "most desirable" species. This approach eliminated 

 most of the advance reproduction since it was predominantly subalpine fir and mountain 

 hemlock . 



Stocking computed on this basis shows significant differences in stocking obtained 

 by the five site preparation treatments (fig. 4). Burning resulted in 50-percent 

 stocking in terms of the "most desirable" stand component; the untreated control pro- 

 duced only 26 percent stocking. On the three sites that received bulldozer scarifi- 

 cations, stocking varied directly with the degree of scarification--from a low of 41 

 percent where lightly scarified to 82 percent on areas that were heavily scarified. 



Number of trees per acre of the "most desirable" components of the reproduction 

 stand varied from 224 trees per acre on the untreated area to 3,000 trees per acre on 

 the sites that received heavy scarification (fig. 4). On the burned area, a relatively 

 small total number of seedlings (690 per acre) resulted in a rather high 4-milacre 

 stocking of 50 percent. On the bulldozer-scarified plots the distribution of repro- 

 duction is definitely patchy--a mosaic of heavily overstocked areas and some understocked 

 portions . 



An appraisal of the contribution of each species and class of reproduction is 

 presented in figure 5 which depicts by species and site preparation the 4-milacre stock- 

 ing and the number of trees per acre of advance and subsequent reproduction. These 

 results are discussed by individual species in the following paragraphs. Since no 

 survey was made to determine the amount and distribution of advance reproduction on the 

 study area prior to treatment, differences in the occurrence of these trees aften%'ards 

 may not accurately reflect treatment effects. 



6 



