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    Author(s): Kenneth W. Seidel
    Date: 1983
    Source: Res. Note PNW-RN-404. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 7 p
    Publication Series: Research Note (RN)
    Station: Pacific Northwest Research Station
    PDF: View PDF  (400.04 KB)

    Description

    A 43-year-old, even-aged stand of advance reproduction of grand fir and Shasta red fir in central Oregon responded to release and thinning with diameter and height growth two to three times the prerelease rate. The response began immediately after the overstory was killed with 2,4-D. Diameter growth during the second 5 years after release increased significantly over that of the first 5 years. Differences in spacing had no effect on growth. Increased growth after release suggests that saving advance true fir reproduction is desirable under certain conditions.

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    Citation

    Seidel, Kenneth W. 1983. Growth of suppressed grand fir and Shasta red fir in central Oregon after release and thinning—10-year results. Res. Note PNW-RN-404. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 7 p

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    Keywords

    growth response, thinning effects, even-aged stands, release, central Oregon, grand fir, Abies grandis, Shasta red fir, Abies magnifica

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