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Guidelines for precommercial thinning of Douglas-fir.Author(s): Donald L. Reukema
Source: Gen. Tech. Rep. PNW-GTR-030. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 10 p
Publication Series: General Technical Report (GTR)
Station: Pacific Northwest Research Station
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DescriptionProduction of merchantable wood in even-aged Douglas-fir stands can be increased substantially by precommercial thinning. Guidelines for, and gains from, precommercial thinning both strongly depend on the size of trees wanted at the first commercial cut; the larger this size, (1) the fewer trees should be left after precommercial thinning, (2) the greater is the maximum age or tree size at which precommercial thinning is practical, and (3) the greater is the gain is usable yield from precommercial thinning. Also, generally, the longer the time required for a stand to reach commercial size without thinning, the greater the gains from precommercial thinning. These and other considerations are discussed, and procedures are recommended.
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CitationReukema, Donald L. 1975. Guidelines for precommercial thinning of Douglas-fir. Gen. Tech. Rep. PNW-GTR-030. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 10 p
KeywordsDouglas-fir, precommercial thinning, stand improvement, stocking control, stocking density
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