A Ratio Approach to Predicting Merchantable Yields of Unthinned Loblolly Pine Plantations

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Abstract:

A stand-level ratio model is presented which uses the stand attributes age, site index, basal area, and number of surviving trees per acre to portion total stand yield to any desired top diameter and/or threshold dbh limit. A model is also presented which distributes the total number of trees by diameter such that the basal area is consistent with total stand basal area. Comparisons with two Weibull-based diameter distribution approaches showed the ratio approach to be a practical and satisfactory alternative. Coefficients for the equations were developed for unthinned old-field and cutover, site-prepared loblolly pine plantations. Forest Sci. 32:287-296.

Keywords: Pinus taeda; mensuration; models; nonlinear regression

Document Type: Journal Article

Affiliations: Assistant Professor, Department of Forest Resources, University of Minnesota, St. Paul, MN 55108

Publication date: June 1, 1986

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