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Estimating Nitrogen Lost from Forest Floor During Prescribed Fires in Douglas-Fir/Western Hemlock Clearcuts

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Nitrogen loss from consumption of forest floor was studied on 33 treatment blocks burned on 11 clearcuts in western Washington and western Oregon. In most cases, nitrogen concentration in forest floor did not change significantly following prescribed fire. Change in the amount of nitrogen in forest floor ranged from an increase of 192 kg/ha to a loss of 666 kg/ha. In most cases, nitrogen loss was directly proportional to the amount of forest floor consumed. Total nitrogen loss can therefore be estimated by multiplying expected loss of forest floor by its nitrogen concentration before the burn. For. Sci. 34(1):152-164.

Keywords: Duff consumption; duff reduction; fire effects; site preparation

Document Type: Journal Article

Affiliations: Research Foresters, USDA Forest Service, Pacific Northwest Research Station, Portland, OR 97208

Publication date: March 1, 1988

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