Resumo

TAMARIT URIAS, Juan Carlos et al. Cubing system for individual Quercus spp. trees in forests under management in Puebla, Mexico. Rev. mex. de cienc. forestales [online]. 2017, vol.8, n.40, pp.69-88. ISSN 2007-1132.

Taper data of 124 specimens of the Quercus genus were processed. The sample was obtained using the destructive method (felling, limbing and sectioning) in forests under management in the state of Puebla, Mexico. 1 709 pairs of diameter-height data were collected. Each section of the tree was cubed using Smalian’s formula, and the tip by the cone volume formula. The total volume per individual was calculated by adding all its cubed sections. The quality of the statistical adjustment of six segmented taper models was assessed, and the model of Fang et al. (2000) was selected because it best describes the stem profile. The latter was simultaneously adjusted with its expression of commercial volume, using the mixed model technique, and the heteroskedasticity was corrected in the resulting model by weighting the error variance with the exponential function and with a weighting factor in the commercial height exclusively for the taper; the autocorrelation was corrected by modeling the error term; for this purpose, a first-order continuous autoregressive structure (AR(1)) was utilized. The cubing system for individual trees (CSIT) was formed by equations that model the stem profile and estimate the total and commercial volume, as well as the commercial height at a minimum diameter at the tip of the stem, and vice versa. The CSIT makes it possible to carry out volumetric estimations of oak trees per surface area unit.

Palavras-chave : Oak forest; product distribution; taper model; stem profile; individual cubing system; commercial volume.

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