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Notes: A General Taper Functional Form to Predict Bole Volume for Five Mixed-Conifer Species in California

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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.

Keywords: California mixed-conifer; Tree form; mensuration; stem profile

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

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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