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Title Large-tree removal in a mixed-conifer forest halves productivity and increases white fir
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Removing all large trees without planning to replace them with either planted or naturally regenerated younger trees (i.e., high-grading) is widely thought to have negative consequences on a forest's productivity and species composition, but no previous studies in California had evaluated this assumption. To make such an evaluation, I measured productivity and canopy species composition shifts following the repeated removal of large trees and compared the results with those from two other basic forest harvest methods: thinning from below and single tree selection. Timber productivity was substantially lower with large-tree removal (0.65 thousand board feet per acre per year) than with the other methods (averaging 1.33 thousand board feet per acre per year), which included the no-harvest control, where yield was zero. Large-tree removal also resulted in more species change, with white fir increasing in the canopy and ponderosa pine decreasing.

York, Robert A. : R.A. York is Research Stations Manager and Adjunct Assistant Professor of Forestry in the UC Center for Forestry and Department of Environmental Science, Policy, and Management at UC Berkeley.
Publication Date Jan 1, 2015
Date Added Apr 30, 2015
Copyright © The Regents of the University of California
Copyright Year 2015

A long-term study in the Sierra Nevada confirms the negative consequences of preferentially removing large trees.

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