Compatible Variable-Form Volume and Stem-Profile Equations for Douglas-Fir

1991

S. 143-151

4 Abb., 3 Tab., zahlr. Lit. Ang.

Unselbständiges Werk

200089217

A simple measure of stem form derived from geometric principles provides a basis for compatible volume and stem profile equations. Height ratios corresponding to three diameter ratios provide this measure and are compared in simple linear regression equations that predict a cylindrical form factor using data from a Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stem analysis study. Further comparisons with existing volume and stem profile models from the literature show substantial gains in reducing above breast height volume prediction errors. Advantages and limitations of the models in both a theoretical and field application context are discussed.