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Persistence of Pinyon Pine Snags and Logs in Southwestern Colorado

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Abstract:

We examined the persistence of pinyon pine (Pinus edulis Engelm.) standing snags and downed logs in southwestern Colorado pinyon-juniper woodlands. The time since death of pinyon pines killed by bark beetles, black stain root disease, or unknown causes in three study areas in southwestern Colorado was determined through monitoring of permanent plots and dendrochronological crossdating methods. The structural condition and form of the trees was recorded and related to the time since death. Pinyon snags may persist for up to 25 years, with persistence of intact snags averaging 8.4 years and broken snags averaging 13.2 years. Sound logs had been dead for a mean of 9.8 years, whereas more fragmented logs had been dead for a mean of 14.4 years. Extremely fragmented trees had been dead for 16.2 years. There was no statistically significant difference in the time since death for snags versus logs in similar condition classes. A simplified rating system to determine the number of years dead for pinyon pine based on form and condition is provided. West. J. Appl. For. 20(4):247–252.

Keywords: Ips confusus; Leptographium wageneri var. wageneri; Pinus edulis; decay; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; natural resource management; natural resources

Document Type: Regular Article

Affiliations: 1: Department of Bioagricultural Sciences and Pest Management Colorado State University Fort Collins CO 80523-1177, Fax: (970) 491-3862, Email: william.jacobi@colostate.edu 2: Department of Bioagricultural Sciences and Pest Management Colorado State University Fort Collins CO 80523-1177 3: Forest Health Management (Retired), Lakewood Service Center USDA Forest Service 740 Sims Golden CO 80401

Publication date: 2005-10-01

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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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