Figure 9, 



t 



u, 



S 



a 



3 



s 



Example of the shape of the desired 

 average basal area per acre by diameter 

 class curve, providing a variety of 

 round-wood materials are product ob- 

 jectives. The amount of basal area de- 

 picted by the curve is depended on the 

 management regime and the productiv- 

 ity of the land to produce wood. 



' total average 



' basal area 

 / per 



' acre 



70% of total average 

 basal area per acre 



Oiameler Class 



Figure 10 . Current average basal area per acre for 

 softwoods by diameter class, IWAI site 

 class 20-49, Working Circle 3. 



Current mean basal area per acre: 68 square feel 



Mean stand age: approximately 62 years old 



Mean potential productivity: approximately 32 ft'/acre/ye«( 



Diameter of average basal area: 60 inches 



Oiameler Class 



-54- 



