THE INFLUENCE OF THINNING 

 of Same Type and Site. Western Hemlock. River-bottom Type. 



27 



Areas of Same Type and Site. Grand Fir. River-bottom Type. 



34 

 (13-9%) 



no 

 (80.0%) 



94 

 (41%) 



+ 176% 



211 

 (86.1%) 



28 

 (20.0%) 



135 



(59%) 

 —36% 



180 

 (48%) 



115 



(25%) 

 -36% 



195 

 (62%) 



75 

 (100%) 



343 

 (75%) 

 + 176%- 



92 



(27.2%) 



65 

 (86.6%) 



162 



(35%) 

 + 176% 



195 

 (62%) 



(96%) 



343 

 (75%) 

 + 176% 



0.155^ 

 0.099 



0.099 



-36% 



225 

 280 

 225 



b Secured by subtracting the increased diameter growth due to thinning for a period of 

 13 years from the average diameter given in above table. The remainder is divided by 

 64.5, the average age of the stand. 



