12000 



6000 



4000 



2000 



+ + J. . + ^ 



+ + 



10 



20 



30 



40 



50 



60 



70 



80 



90 



SITE INDEX 



Figure 55 — Western larch yield vs. site index at 80 years of age 

 (total cubic feet). 



100 



Figure 56 — Quadratic mean diameter vs. age for western larch unthinned 

 plantations in Inland Northwest forests. 



48 



