Segmented taper equations with crown ratio and stand density for Dahurian Larch (Larix gmelinii) in Northeastern China
 Lichun Jiang,
 Ruilong Liu
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Segmented taper equation was selected to model stem profile of Dahurian larch (Larix gmelinii Rupr.). The data were based on stem analysis of 74 trees from Dailing Forest Bureau in Heilongjiang Province, Northeastern China. Two taper equations with crown ratio and stand basal area were derived from the Max and Burkhartâ€™s (1976) taper equation. Three taper equations were evaluated: (1) the original equation, (2) the original equation with crown ratio, and (3) the original equation with basal area. SAS NLIN and SYSNLIN procedures were used to fit taper equations. Fit statistics and crossvalidation were used to evaluate the accuracy and precision of these models. Parameter estimates showed that the original equation with inclusion of crown ratio and basal area variables provided significantly different parameter estimates with lower standard errors. Overall fit statistics indicated that the root mean square error (RMSE) for diameter outside and inside bark decreased respectively by 10% and 7% in the original model with crown ratio and by 12% and 7.2% in the original model with basal area. Crossvalidation further confirmed that the original equation with inclusion of crown ratio and basal area variables provided more accurate predictions at the lower section (relative heights, <10%) and upper section (relative heights, >50%) for both outside and inside bark diameters.
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 Title
 Segmented taper equations with crown ratio and stand density for Dahurian Larch (Larix gmelinii) in Northeastern China
 Journal

Journal of Forestry Research
Volume 22, Issue 3 , pp 347352
 Cover Date
 20110901
 DOI
 10.1007/s1167601101784
 Print ISSN
 1007662X
 Online ISSN
 19930607
 Publisher
 Northeast Forestry University
 Additional Links
 Topics
 Keywords

 basal area
 crown ratio
 Larix gmelinii
 nonlinear regression
 taper equations
 Authors

 Lichun Jiang ^{(1)}
 Ruilong Liu ^{(1)}
 Author Affiliations

 1. College of Forestry, Northeast Forestry University, 26 Hexing road, Harbin, 150040, Heilongjiang Province, P.R. China