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The Effect of Eccentricity on the Estimation of Basal Area and Basal Area Increment of Coniferous Trees

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A sample of noncircular tree cross-sections was examined to determine basal area and basal area increment. Basal area estimates were calculated with a circular model from single measurements of diameter and from averages of two diameter measurements. Basal area increment estimates were made with several geometric models from single measurements of radial increment and averages of two measurements of radial increment. Commonly used tree cross-sectional area estimates investigated were biased, usually overestimating basal area. Several generalized geometric models of area increment were investigated, but none tested were uniformly supported by the data with accuracy related to the specific increment measurements selected. However, results indicated that either a single increment measurement taken on the minor axis or the shortest increment from the major axis yielded accurate estimates of basal area increment for several of the models tested. For. Sci. 34(3):621-633.

Keywords: Mensuration; basal area increment; cross-sectional area; eccentric; out-of-round

Document Type: Journal Article

Affiliations: Professor, Department of Forestry and Resource Management, University of California, Berkeley, CA 94720

Publication date: September 1, 1988

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.
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