Figure 13. — Mixed reproduction predominately ponderosa pine on cut-over Land {survey type 22). 



Figure 14. — Lodgepole pine forest on the Pringle Falls 

 Experimental Forest, central Oregon. 



Woodland and Hardwood Forests 



The juniper woodland types (5A, 5B) are much 

 more common in this region than in the Douglas-fir 

 region, occupying 1.5 million acres, practically all 

 in eastern Oregon (fig. 16). These forests are of 

 low commercial value for timber production, their 

 chief products being fence posts and fuel wood for 

 nearby rural residents, but they are so open as to be 

 extensively grazed. The oak-madrone type (4) and 

 hardwood types (31, 31%) (fig. 17) are of little 

 economic significance here. 



Forest Site Quality 



The index of site quality, or the relative produc- 

 tive capacity of a forest area determined by climate, 

 soil, topography, and other factors, was taken as 

 average height of the dominant stand at 100 years 

 of age. Six site-quality classes are recognized for 

 ponderosa pine and five for Douglas-fir, class 1 

 being the highest in both cases (table 8) . The pon- 

 derosa pine site classification was applied to 12 

 million acres consisting of land now supporting 

 ponderosa pine, pine mixture, and white fir types 

 and deforested land which originally supported 

 such types. The Douglas-fir site classification was 

 applied to all the remaining commercial conifer 

 land aggregating 4.1 million acres. 



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