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A Production Function Analysis of Loblolly Pine Yield Equations

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A timber production function analysis for unthinned loblolly pine plantations was made using a four-equation system. In the system, the yield equation is the production function. The production function and other equations fit the data well, using biological consistency, significance, goodness of fit, and minimal collinearity as criteria. The system also predicted volume for lightly and heavily thinned stands with a Mean Difference of 2 and 5% of mean volume, respectively. Analysis of the production function coefficients verified the functional form. More specifically, all input factors are complementary, output elasticities indicate a relatively unresponsive production function, the Elasticity of Scale is 2.3, the elasticities of substitution lie between zero and 1.0, and the production function has Variable Elasticity of Substitution (VES). For. Sci. 35(3):775-788.
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Keywords: Growth and yield; Pinus taeda; elasticity

Document Type: Journal Article

Affiliations: Thomas M. Brooks Professor of Forest Biometrics, Department of Forestry, Virginia Polytechnic Institute and State University

Publication date: 1989-09-01

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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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