Regional height-diameter equations for major tree species of southwest Oregon.

Abstract

Selected tree height and diameter functions were evaluated for their predictive abilities for major tree species of southwest Oregon. The equations included tree diameter alone, or diameter plus alternative measures of stand density and relative position. Two of the base equations were asymptotic functions, and two were exponential functional forms. The inclusion of the crown competition factor in larger trees and basal area, which indicates the relative position of a tree and stand density, into the base height-diameter equations increased the accuracy of prediction for all species. On the average, root mean square values were reduced by 40.4 cm (19 percent improvement). Two equations are recommended for estimating tree heights for major tree species in southwest Oregon.

Citation

Temesgen, H.; Hann, D.W.; Monleon, V.J. 2006. Regional height-diameter equations for major tree species of southwest Oregon. Western Journal of Applied Forestry. 22(3): 213-219