6000 - 



6000 



o 4000 



2000 



MGMT 



000 



POO 



PCB 

 PCA 

 PCI 



Figure 65— Effect of thinning on total yield of western larch plantations (total 

 cubic feet), site index 50. 



10000 ■ 



6000 - 



4000 - 



2000 - 



MGMT 



000 

 POO 

 PCA 

 PCB 

 PCI 



Figure 66 — Effect of thinning on total yield of western larch plantations (total cubic 

 feet), site index 70. 



53 



