. Potential production in thinned Douglas-fir plantations. Douglas fir; Forests and forestry Mensuration; Forest thinning. When stand basal areas are substituted for stand density indexes in these comparisons, practically all stands are above normal at 25 years (fig. 4). This suggests Douglas-fir plantations generally can accrue basal area and volume faster at early ages than indicated by Bulletin 201. This is also true of some natural stands in the Pacific Northwest (Briegleb 1 942). Some of the apparent differences in basal area can be attributed to differences in site index which had practi
. Potential production in thinned Douglas-fir plantations. Douglas fir; Forests and forestry Mensuration; Forest thinning. When stand basal areas are substituted for stand density indexes in these comparisons, practically all stands are above normal at 25 years (fig. 4). This suggests Douglas-fir plantations generally can accrue basal area and volume faster at early ages than indicated by Bulletin 201. This is also true of some natural stands in the Pacific Northwest (Briegleb 1 942). Some of the apparent differences in basal area can be attributed to differences in site index which had practically no effect on relative density comparisons. 250^ 8 2°o CO D" £ 150 o < tr LU Q_ w 100 < < to < CO 50 NUMBERS INDICATE SITE INDEX 142 640 140. see figure 1 for code 10 20 30 AGE (years) 40 50 60 Figure basal area midway between thinnings (site index range, 130-147). 9. 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 Bruce, David, 1916-; Pacific Northwest Forest and Range Experiment Station (Portland, Or. ). Portland, Or. : Pacific Northwest Forest and Range Experiment Station, U. S. Dept. of Agriculture
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Keywords: ., bookcentury1900, bookcollectionbiodiversi, booksubjectdouglasfir
