20000 



y 16000 



12000 



b 8000 



SITE INDEX 



100 



90 

 80 



70 

 60 



50 

 40 



Figure 7 — Douglas-fir yield curves for untiiinnecl plantations in Inland Northwest 

 forests (total cubic feet, all stems). 



S 15000 



o 12000 



9000 



3000 



SITE INDEX 



100 



90 

 80 



70 

 60 



50 

 40 



Figure 8 — Douglas-fir yield curves for untiiinned plantations in Inland Northwest 

 forests (merchantable cubic feet, 4.5-inch top, stems greater than 7 inches d.b.h.). 



14 



