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Title: Avaliação de funções de afilamento de expoente-variável para árvores de Eucalyptus spp.
Other Titles: Evaluation of variable-exponent taper functions for Eucalyptus spp. Trees
Keywords: Ponto de inflexão
Equações de afilamento de Kozak
Diâmetros com casca e sem casca
Volume total
Inflection point
Kozak’s taper equation
Diameter inside and outside bark
Total volume
Issue Date: Mar-2019
Publisher: Instituto de Pesquisas e Estudos Florestais
Citation: ALVES, J. de A. et al. Avaliação de funções de afilamento de expoente-variável para árvores de Eucalyptus spp. Revista Scientia Forestalis, Piracicaba, v. 47, n. 121, p. 45-58, mar. 2019.
Abstract: Variable-expoent taper functions were fitted to Eucalyptus spp. data, using different approaches for estimating inflection point (p). The precision and the prediction abilities of the taper functions were evaluated for diameter along the stem and total volume (inside bark and outside bark). A new approach was presented for estimating the p value and a modified version of Kozak’s model was developed. The geometrical methods EDE (Extremum Distance Estimator), ESE (Extremum Surface Estimator), BEDE (Bisection - EDE) e BESE (Bisection - ESE) can be applied as an alternative to estimate p. The fitted equations performed well, with good precisions (Syx% de 6.35% a 7.20%) and good ability to predict diameter along the stem and total volume (outside and inside bark). It was found that the different approches tested to determine p had little influence on the precision of the equations. It was observed that the relative height at the inflection point (p) varies from tree to tree and the results indicated that DBH and H have little or no effect in this variation. The modified variable exponent was similar to Kozak’s equations, but it is advantagious because it is a simpler exponent.
Appears in Collections:DCF - Artigos publicados em periódicos

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