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Young Stand Development in Coastal Western Hemlock as Influenced by Three Harvesting Regimes

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Growth patterns of naturally regenerated western hemlock (Tsuga heterophylla [Raf.] Sarg.) were studied by stem analysis following partial cutting of a dense, second-growth stand on the Washington coast. Three partial cutting densities comparable to thinning, shelterwood cutting, and seed-tree cutting were established when the stand was 60 years old; final overstory removal occurred 8 years after the initial cut (and 4 years after an intermediate cut) in all treatments. Stocking resulting from each treatment was similar and excessive, and ranged from 12,400 to 212,500 stems per hectare. It consisted predominantly of trees established between the initial and final cuts. Eight years after the final harvest cut, heights, ages, and diameters of dominants in the regenerated stand were greatest in the light (most open) treatment; trees were shorter, younger, and smaller in diameter with progressively denser overstory treatments. Although rather different in present appearance, the young stands followed similar patterns of canopy differentiation, dominant height growth, and dominance assertion after the final overstory removal. The dominant stems consistently asserted themselves over other stems after 2 meters height. Forest Sci. 30: 117-124.
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Keywords: Tsuga heterophylla; advance regeneration; natural regeneration; shelterwood; stand differentiation

Document Type: Journal Article

Affiliations: Principal Silviculturist, Pacific Northwest Forest and Range Experiment Station, USDA Forest Service, Olympia, WA 98502

Publication date: 1984-03-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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