A volume prediction system for Quercus robur L. in Galicia (Northwestern Spain) based on a volume ratio equation

  • M. Barrio Anta Universidad de Santiago de Compostela
  • J. G. Álvarez González Universidad de Santiago de Compostela
  • I. J. Díaz-Maroto Hidalgo Universidad de Santiago de Compostela
DOI: https://doi.org/10.5424/srf/2004133-00849
Keywords: Quercus robur, equation, total volume, volume ratio, product classification

Abstract

Eight total-volume equations and four volume-ratio equations (for diameter limits) were fitted to a sample of 225 trees of Quercus robur of different ages. The trees were collected in stands growing in a great variety of site qualities and densities in Galicia (Northwest of Spain). The data employed to develop volume ratio equations have a longitudinal structure so a second order autoregressive model was used to correct the error dependence implicit in this kind of data. Several «goodness-of-fit» statistics were used in order to select the best equations within each group (total volume equations and volume ratio equations) and cross-validation was used to analyse the performance of the model. Finally, the models selected were combined to develop a volume equation with product classification.

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Published
2004-12-01
How to Cite
Barrio Anta, M., Álvarez González, J. G., & Díaz-Maroto Hidalgo, I. J. (2004). A volume prediction system for Quercus robur L. in Galicia (Northwestern Spain) based on a volume ratio equation. Forest Systems, 13(3), 506-517. https://doi.org/10.5424/srf/2004133-00849
Issue
Vol. 13 No. 3 (2004)
Section
Research Articles

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