Western larch was also benefited by the cleanings although all of the largest trees of 

 this species had been cut; of those remaining, the taller ones outgrew the dominant 

 larch on the check plot by about a third during the 30 years after treatment. The 

 height growth of lodgepole pine closely matched that of western larch in the check plot, 

 but too few of the lodgepole pine reappeared in the other plots after cleaning for valid 

 height comparisons. 



Although the rates of western redcedar height growth were comparatively slow on 

 all plots, it is noteworthy that the redcedar grew about twice as fast in the heavily 

 cleaned plot after treatment as it did in the check plot. The results for western 

 hemlock were nearly identical to those for redcedar, even in the cleaned plots where 

 the hemlock had been strongly discriminated against. Heights of the two species, 

 therefore, were combined for the treatment comparisons in figure 3. 



200 r 



150 



CO 



DC 

 < 

 —I 

 < 

 CO 



< 



100 



50 



6+ in. 



5 in. 



4 in. 



3 in. 



1-2 in. 



7+ in. 



6 in. 



5 in. 



4 in. 



3 in. 



1-2 in. 



8+ in. 



7 in. 



6 in. 



5 in. 



4 in. 



3 in. 



1-2 in. 



UNCLEANED 

 (CHECK PLOT) 



iVIODERATELY 

 CLEANED 



HEAVILY 

 CLEANED 



Figure 2.— Effect of moderate and heavy cleanings on total basal area per acre ZO yeoj's 

 after treatment by 1-inch d.b.h. classes. Upper West Branch study. 



4 



