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Fall Rate of Lodgepole Pine Killed by the Mountain Pine Beetle in Central Oregon

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The fall rate of nearly 600 lodgepole pines(Pinus contorta)killed by the mountain pine beetle (Dendroctonus ponderosae) in central Oregon was investigated in thinned and unthinned stands. Estimates were obtained by fitting a complementary log-log model to the conditional probabilities of trees falling within a given year. Snags began falling 3 yr after death in thinned stands and 5 yr in unthinned stands. Small trees fell slightly faster than large trees in thinned stands, but tree size was not a factor in the fall rate in unthinned stands. In thinned stands, 50% were down in 8 yr and 90% were down in 12 yr. In unthinned stands, 50% were down in 9 yr and 90% were down in 14 yr. No particular calendar year had tree fall that was significantly greater than average. All beetle-killed trees broke off at the ground when they fell. The rate that trees fall in different environments may be related to the speed of bole decay at the ground level. West. J. Appl. For. 13(1):23-26.
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Document Type: Journal Article

Affiliations: USDA Forest Service, Pacific Southwest Research Station, 800 Buchanan Street, West Annex, Albany, CA 94710

Publication date: 1998-01-01

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  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Western Journal of Applied Forestry covers the western United States, including Alaska, and western Canada; WJAF will also consider manuscripts reporting research in northern Mexico that has potential application in the southwestern United States.
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