Largest-Crown-Width Prediction Models for 53 Species in the Western United States
Abstract:The mean crown diameters of stand-grown trees 5.0-in. dbh and larger were modeled as a function of stem diameter, live-crown ratio, stand-level basal area, latitude, longitude, elevation, and Hopkins bioclimatic index for 53 tree species in the western United States. Stem diameter was statistically significant in all models, and a quadratic term for stem diameter was required for some species. Crown ratio and/or Hopkins index also improved the models for most species. A term for stand-level basal area was not generally needed but did yield some minor improvement for a few species. Coefficients of variation from the regression solutions ranged from 17 to 33%, and model R2 ranged from 0.15 to 0.85. Simpler models, based solely on stem diameter, are also presented. West. J. Appl. For. 19(4):245–251.
Keywords: Largest crown width; crown diameter; crown modeling; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; natural resource management; natural resources; tree crown width
Document Type: Regular Article
Affiliations: Southern Research Station USDA Forest Service P.O. Box 2680 Asheville NC 28802 Phone: (828) 257-4357;, Fax: (828) 257-4894, Email: firstname.lastname@example.org
Publication date: October 1, 2004
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