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Testing Volume Equation Accuracy with Water Displacement Techniques

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Water displacement was used to determine true volumes of 243 logs from 75 eastern hardwood trees ranging from 6 to 27 inches in dbh. Fourteen different equations were then used to estimate these volumes and the results were compared to the true values in both accuracy and precision. The volume estimates were first made by using the measured log and tree dimensions. Next, heights and lengths were estimated with a taper function using specified diameter limits, and the volumes were then estimated using these predicted values. Both tests were repeated for merchantable tree volume as well as log volume. One of the taper-based equations and two traditional volume equations performed best overall for various types of volume prediction. Forest Sci. 30:41-50.
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Keywords: Taper functions; log volumes; tree volumes

Document Type: Journal Article

Affiliations: Extension Forester, Forestry Department, University of Wisconsin, 1630 Linden Drive, Madison, WI 53706

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.

    2016 Impact Factor: 1.782 (Rank 17/64 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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