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    Author(s): J. M. Schmid; S. A. Mata; W. C. Schaupp
    Date: 2009
    Source: Res. Note. RMRS-RN-40. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 6 p.
    Publication Series: Research Note (RN)
    Station: Rocky Mountain Research Station
    PDF: View PDF  (509.76 KB)

    Description

    Mountain pine beetle-killed ponderosa pine trees in three stands of different stocking levels near Bear Mountain in the Black Hills National Forest were surveyed over a 5-year period to determine how long they persisted as unbroken snags. Rate of breakage varied during the first 5 years after MPB infestation: only one tree broke during the first 2 years in the three stands; breakage increased during the third year; the highest percentage of snags broke during the fourth year; and 10% to 14% broke in the fifth year. Cumulatively, snag breakage was 76%, 91%, and 95% in a GSL 80/90, GSL 100/110, and unmanaged stand, respectively. On average, 56% of the snags broke below 25 ft. The rate and height of breakage in mountain pine beetle-killed trees indicates that they are unlikely to persist as suitable snags for more than 5 to 10 years after infestation.

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    Citation

    Schmid, J. M.; Mata, S. A.; Schaupp, W. C., Jr. 2009. Mountain pine beetle-killed trees as snags in Black Hills ponderosa pine stands. Res. Note. RMRS-RN-40. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 6 p.

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    Keywords

    mountain pine beetle, snags, stands, breakage, Bear Mountain, Black Hills National Forest

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