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Largest-Crown-Width Prediction Models for 53 Species in the Western United States

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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.
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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:

Publication date: 2004-10-01

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  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Western Journal of Applied Forestry covers the western United States, including Alaska, and western Canada; WJAF will also consider manuscripts reporting research in northern Mexico that has potential application in the southwestern United States.
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