Deriving Growth and Yield Functions for Uneven-Aged Forest Stands
Abstract: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.
Document Type: Journal Article
Affiliations: Chairman, Dept of Forest Resources, Univ. of New Hampshire, Durham
Publication date: 1969-06-01
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- 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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