. 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 - 900 -. Figure 6—Total net cubic volume yield after 20 years for planted ponderosa pine, lodgepole pine, and a mixture of both species growing at five initial spacings. Average diameters (inches in ) for each density are shown in parentheses. Conclusions Volume yield after 20 years in these planted stands was similar for the pure pon- derosa, pure lodgepole, and mixed species except for
. 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 - 900 -. Figure 6—Total net cubic volume yield after 20 years for planted ponderosa pine, lodgepole pine, and a mixture of both species growing at five initial spacings. Average diameters (inches in ) for each density are shown in parentheses. Conclusions Volume yield after 20 years in these planted stands was similar for the pure pon- derosa, pure lodgepole, and mixed species except for the unexpected reduction in volume yield of pure ponderosa pine at the 6- and 12-foot spacings. The growth response to stand density followed the usual pattern of greater volume growth and less diameter growth as stand density increased (closer spacing). Spacing studies provide information to land managers on tradeoffs between diameter growth rates and volume yields at various stand densities. A relatively wide spacing generally is desirable in young seedling and sapling-size stands to promote rapid diameter growth and thus shorten the time for trees to reach merchantability limits for lumber production. Wide spacings are also indicated if precommercial thinning is not a management option. It is important to select a plantation spacing that will not result in basal area levels that cause reduced tree vigor and predispose the stand to attacks from the mountain pine beetle {Dendroctonus ponderosae Hopkins) before the first thinning can be made (Barrett 1979, Larsson and others 1983, Mitchell and others 1983). 13. 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 Northw
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