. A ponderosa pine-lodgepole pine spacing study in central Oregon : results after 20 years. Forest thinning Oregon; Trees Oregon Growth; Ponderosa pine Oregon Spacing; Lodgepole pine Oregon Spacing. 1000 -i 900 - BOO „. ® 700 d) >- P o s re 3 ._ 600 O o. SS 500 c o; re o 400 <i 300 200 - 100 - 0 - B. Age (years) Figure 5—Total net cubic volume yield of trees growing at five initial spacings from age 11 to 20: (A) ponderosa pine and (B) lodgepole pine. To produce trees of given sizes () in less time, or conversely, to produce larger trees in the same time, stand density must be cont
. A ponderosa pine-lodgepole pine spacing study in central Oregon : results after 20 years. Forest thinning Oregon; Trees Oregon Growth; Ponderosa pine Oregon Spacing; Lodgepole pine Oregon Spacing. 1000 -i 900 - BOO „. ® 700 d) >- P o s re 3 ._ 600 O o. SS 500 c o; re o 400 <i 300 200 - 100 - 0 - B. Age (years) Figure 5—Total net cubic volume yield of trees growing at five initial spacings from age 11 to 20: (A) ponderosa pine and (B) lodgepole pine. To produce trees of given sizes () in less time, or conversely, to produce larger trees in the same time, stand density must be controlled to attain the diameter growth rate sufficient to reach the target diameter within the desired time frame. Be- cause maximum volume yield generally occurs at high stand densities, and maximum diameter growth occurs at low densities, some yield is sacrificed to produce larger trees within a given time. In pure lodgepole pine, for example, average stand diam- eter increased from inches to inches after 20 years as the number of trees per acre decreased from 1,210 to 538. This also resulted in a volume yield reduction of about 28 percent. 12. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Seidel, Kenneth W; Pacific Northwest Research Station (Portland, Or. ). [Portland, Or. ] : U. S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station
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