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A Sampling Strategy for Estimating Past Crown Recession on Temporary Growth Plots

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Abstract:

Seven alternative sampling strategies for estimating past crown recession on temporary plots were compared using known 5-yr recession rates reconstructed on permanent plots. Actual past crown recession was established on 28 Douglas-fir trees by application of a branch mortality dating technique to all branches in 10-15 whorls below present crown base. Seven sampling schemes were then chosen to sample only two or four whorls per tree. Proposed estimators for each scheme were applied to compute past crown recession for each tree over various 5-yr intervals. Simple linear regressions of estimated on actual recession demonstrated that several of the sampling strategies produced an intercept and slope not significantly different (P < 0.01) from zero and one, respectively, and hence were satisfactory for estimating past 5-yr crown recession on these plots. Extension of this technique by tailoring sampling strategies to specific site conditions is discussed. For. Sci. 36(3):549-563.

Keywords: Crown recession; sampling strategy; stem dissection; temporary plots

Document Type: Journal Article

Affiliations: Associate Professor, Department of Forest Management, Oregon State University, Corvallis, OR 97331

Publication date: September 1, 1990

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