Notes: A General Taper Functional Form to Predict Bole Volume for Five Mixed-Conifer Species in California
Abstract:Bole volume can be estimated to varying merchantability standards from a stem profile. Stem analysis of 724 white fir, incense-cedar, ponderosa pine, sugar pine, and Douglas-fir trees from the Sierra Nevada, California, showed that trunk outlines above breast height for the five mixed-conifer species have a common functional form. A two-variable model developed from prior research on planted slash pine in Florida and Georgia was used to predict underbark diameters of these species. The model employs bole diameter and height measurements as its two variables to predict volume to a variable top diameter accurately and precisely. Underbark diameters can be predicted with a standard error of 1.6 cm or less. The recommended model is compared with five others, ranging from simple to complex, in terms of diameter prediction, and found to be best in the majority of cases. Forest Sci. 30:166-171.
Document Type: Miscellaneous
Affiliations: Research Forester, Pacific Southwest Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture, Berkeley, CA 94701
Publication date: 1984-03-01
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