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Taper tables for western hemlock.Author(s): Floyd A. Johnson; Wilbur Engstrom
Source: PNW Old Series Research Notes No. 51, p. 1-5
Publication Series: Research Note (RN)
Station: Pacific Northwest Research Station
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DescriptionIn 1947 the West Coast Forestry procedures Committee recommended several mensuration projects, one of which called for the construction of taper tables for Western hemlock. In response the present tables were prepared. Basic data for these tables consist of measurements of 912 trees taken a number of years ago by members of the Pacific Northwest Forest & Range Experiment Station. The trees were measured at widely scattered points in western Washington and Oregon, and they represent a wide variety of sites and form classes The method used has been described in detail by Bruce and Schumacher, who also discuss some of the uses of taper tables. These tables are based on a 2-foot stump. They show diameters inside bark at the tops of 16.3-foot logs by 2-inch d.b.h. classes within 20-foot total height classes. To facilitate interpolations, values are given to the nearest tenth of an inch.
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CitationJohnson, Floyd A.; Engstrom, Wilbur. 1949. Taper tables for western hemlock. PNW Old Series Research Notes No. 51, p. 1-5
- Estimating upper stem diameters and volume of Douglas-fir and Western hemlock trees in the Pacific northwest
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- Total height volume tables for western hemlock, sitka spruce and young-growth Douglas-fir (based on 32-foot logs and an 8-inch top).
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