SITE INDEX 



100 



10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 



ASE 



Figure 9 — Douglas-fir yield curves for unthinned plantations in Inland Northwest 

 forests (merchantable board feet [Scribner], 4.5-inch top, stems greater than 

 7 inches d.b.h.). 



30 T 



40 50 60 70 80 90 100 



SITE INDEX MIDPOINT 



Figure 10— Distribution of Douglas-fir plantation site index values for Inland 

 Northwest forests. 



15 



