A Test of Six Methods for Estimating True Heights from Stem Analysis Data
Six published or proposed methods of estimating the height corresponding to a given age with sectioned-tree stem analysis data were compared using actual heights at known ages for 28 loblolly pine trees. The most accurate was Carmean's (1972) method, which assumes that height growth is constant for each year contained within a bolt and that each crosscut occurs in the middle of a year's growth. Methods proposed by Lenhart (1972) and by Newberry (1978) were less accurate but probably acceptable. These three methods produce data that, when used to fit a nonlinear height-age model with Richards' (1959) equation, gave more than 80% overlap in the asymptotic 95% confidence intervals of the parameter estimates. Resulting height-age curves were nearly coincident for these three methods. For. Sci. 33(1):3-13.
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Document Type: Journal Article
Affiliations: Professor of Forest Biometrics and Management in the School of Forest Resources, University of Georgia, Athens, GA 30602
Publication date: 1987-03-01
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