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    Author(s): William W. Oliver
    Date: 1979
    Source: Res. Note PSW-341. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 7 p
    Publication Series: Research Note (RN)
    PDF: View PDF  (2.06 MB)

    Description

    Ponderosa pine (Pinus ponderosa Laws.) was planted at five different spacings, from 6 by 6 to 18 by 18 feet, on a productive site in northern California. Spacing and brush effects on tree growth were evaluated both on plots where brush was allowed to develop and on plots kept free of brush. Competition between trees in brush-free plots began during the 8th year for trees spaced 6 by 6 feet and during the 10th year for trees spaced 9 by 9 feet. On several plots brush competition reduced tree diameters by the equivalent of nearly 3 years growth. These early results forecast the strong influence of spacing and brush on tree growth.

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    Citation

    Oliver, W. W. 1979. Early response of ponderosa pine to spacing and brush: observations on a 12-year-old plantation. Res. Note PSW-341. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 7 p.

    Keywords

    Pinus ponderosa, tree growth, diameter increment, plantation spacing, ground cover, plant competition, brush, northern California

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