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

Informally Refereed

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 requiredfor 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.

Keywords

Largest crown width, tree crown width, crown diameter, crown modeling

Citation

Bechtold, William A. 2004. Largest-Crown- Width Prediction Models for 53 Species in the Western United States. West. J. Appl. For. 19(4):245-251.
https://www.fs.usda.gov/research/treesearch/7732