24000 r 



20000 • 



16000 



QC 12000 - 



8000 



4000 



MGMT 

 000 

 POO 



PCB 



PCI 

 PCA 



Figure 63 — Effect of thinning on standing volume of western larch for Inland 

 Northwest forests (merchantable board feet [Scribner]), site index 50. 



36000 



> 24000 



5 18000 ■ 



12000 - 



6000 - 



MGMT 



000 

 POO 



PCB 



PCI 

 PCA 



10 20 30 40 



60 70 80 90 100 110 120 130 140 150 

 AGE 



Figure 64 — Effect of thinning on standing volume of western larch for Inland 

 Northwest forests (merchantable board feet [Scribner]), site index 70. 



52 



