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Deriving Growth and Yield Functions for Uneven-Aged Forest Stands

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Traditional yield tables are being replaced by yield functions which are obtained from the mathematical integration of growth-rate equations, expressed primarily as a function of stand age. In the uneven-aged stand, stand age has nebulous meaning which imposes difficulty in applying the above technique. The present study proposes use of a growth-rate equation expressed as a function of a measurable size characteristic of the quantity under investigation. Solution of the growth-rate equation provides a yield function expressed in terms of elapsed time from a given initial condition. As an illustration, survivor basal area growth-rate and volume growth-rate data are fitted to empirical differential equations. Integration provides basal area and volume yield prediction functions. Results indicate that compatible growth-rate and yield functions for the uneven-aged stand can be derived from permanent plot data.

Keywords: Increment; compatible growth and yield; permanent plot analysis

Document Type: Journal Article

Affiliations: Chairman, Dept of Forest Resources, Univ. of New Hampshire, Durham

Publication date: 1969-06-01

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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