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Riparian Management Area Condition for Timber Harvests Conducted Before and After the 1994 Oregon Water Protection Rules

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The 1994 Oregon Water Protection Rules introduced new and expanded requirements for streamside timber harvesting. Postharvest conditions in Riparian Management Areas (RMAs) were evaluated on 21 harvests throughout Oregon in 1995 and compared to results of 22 harvests from a study completed in 1993. Average conifer retention in these RMAs increased from 35% in 1993 to 75% in 1995, a desirable change for long-term supplies of large woody debris for fish habitat. Differences in distance from stream to harvest edge and percent of exposed mineral soil in the RMAs were not significant. Sites visited in 1995 averaged significantly more snags in RMAs than sites from the 1993 study, although snag diameters tended to be smaller, and greater numbers could be related to preharvest snag densities on sites. Although the RMA shade data were limited in this study, the 1994 Rules apparently provide at least as much shade as under the previous rules on most sites. West. J. Appl. For. 15(3):147-153.
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Document Type: Journal Article

Affiliations: Oregon State University Dept. of Forest Engineering, 213 Peavy Hall, Corvallis, OR 97331

Publication date: 2000-07-01

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