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    Author(s): John F. Bell; Alan B. Berg
    Date: 1972
    Source: Res. Pap. PNW-RP-130. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 24 p
    Publication Series: Research Paper (RP)
    Station: Pacific Northwest Research Station
    PDF: View PDF  (2.70 MB)

    Description

    Public and private agencies are cooperating in a study of eight thinning regimes in young Douglas-fir stands. Regimes differ in the amount of basal area allowed to accrue in growing stock at each successive thinning. All regimes start with a common level-of-growing-stock which is established by a conditioning thinning.

    Thinning interval is controlled by height growth of crop trees, and a single type of thinning is prescribed.

    Nine study areas, each involving three completely random replications of each thinning regime and an unthinned control, have been established in western Oregon and Washington, U.S.A., and Vancouver Island, Canada. Site quality of these areas varies from I through IV.

    Climatic and soil characteristics for each area and data for the stand after the conditioning thinning are described briefly.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Bell, John F.; Berg, Alan B. 1972. Levels-of-growing-stock cooperative study on Douglas-fir: report no. 02—The Hoskins Study, 1963-1970. Res. Pap. PNW-RP-130. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 24 p

    Keywords

    thinnings, stand growth, Douglas-fir, forest improvement cutting

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https://www.fs.usda.gov/treesearch/pubs/26254