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Estimating the weight of crown segments for old-growth Douglas-fir and western hemlock.Author(s): J.A. Kendall Snell; Timothy A. Max
Source: Res. Pap. PNW-RP-329. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 28 p
Publication Series: Research Paper (RP)
Station: Pacific Northwest Research Station
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DescriptionThe purpose of this study was to develop and validate estimators to predict total crown weight and weight of any segment of crown for old-growth felled and bucked Douglas-fir and western hemlock trees. Equations were developed for predicting weight of continuous live crown, total live crown, dead crown, any segment of live crown, and individual branches for old-growth Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and western hemlock (Tsuga heterophylla (Raf.) Sarg.) trees. A branch method and a ratio method were developed for estimating the weight of crown segments. Equations were based on data from 32 Douglas-fir and 29 western hemlock trees from the Gifford Pinchot National Forest in southwestern Washington. An additional 49 Douglas-fir and 50 western hemlock were selected for validating the models. For predicting weight of a segment of crown, the branch method was less biased and more accurate than the ratio method. The branch method is recommended for felled trees because it more easily accommodates the large amount of breakage in the crown of felled old-growth trees.
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CitationSnell, J.A. Kendall; Max, Timothy A. 1985. Estimating the weight of crown segments for old-growth Douglas-fir and western hemlock. Res. Pap. PNW-RP-329. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 28 p
Keywordscrown weights, estimates, moisture content (wood), old-growth stands, Douglas-fir, western hemlock
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