Stem taper functions for maritime pine (Pinus pinaster Ait.) in Galicia (Northwestern Spain)

A total of 31 taper functions from 3 different groups of models (single, segmented and variable-form taper functions) were fitted to diameter-height data from 203 Pinus pinaster trees sampled across even-aged stands in Galicia (northwestern Spain). Most of the taper functions analyzed showed problem...

Full description

Saved in:
Bibliographic Details
Published inEuropean journal of forest research Vol. 124; no. 3; pp. 177 - 186
Main Authors Rojo, A, Perales, X, Sánchez-Rodríguez, F, Álvarez-González, J. G, Gadow, K. von
Format Journal Article
LanguageEnglish
Published Dordrecht Berlin/Heidelberg : Springer-Verlag 01.10.2005
Springer Nature B.V
Subjects
Online AccessGet full text

Cover

Loading…
More Information
Summary:A total of 31 taper functions from 3 different groups of models (single, segmented and variable-form taper functions) were fitted to diameter-height data from 203 Pinus pinaster trees sampled across even-aged stands in Galicia (northwestern Spain). Most of the taper functions analyzed showed problems of multicollinearity as indicated by the condition number. A second-order autoregressive CAR(2) error process was incorporated into the models to minimize the effect of autocorrelation inherent in the longitudinal data used, and to provide valid tests of significance for model parameter estimates. In general, variable-form taper functions provided the most accurate predictions. The flexibility and predictive performance of the variable-form model developed by Kozak (For Chron 80(4):507-515, 2004) indicated its usefulness for estimating diameter at a specific height, merchantable volume, and total volume of Maritime pine in the study area.
Bibliography:http://dx.doi.org/10.1007/s10342-005-0066-6
ISSN:1612-4669
1612-4677
DOI:10.1007/s10342-005-0066-6