I 



30 r 



UNCLEANED (CHECK PLOT) 



Hemlock 





Fir 









White pine 







Redcedar 





10 20 30 



YEARS SINCE STUDY BEGAN 



YEARS SINCE STUDY BEGAN 



Figure 6. — Effect of cleaning on the height growth of western white ■pine, grand fir, 



western redcedar, and western hemlock Chased on the 100 tallest trees per acre of 

 each species). Lower Sands Creek study. 



10 



