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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: 1990-09-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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