Bole Profile of Eucalyptus Under Two Conduction Regimes in the Southwest Region of the Brazilian State Bahia

Abstract

The study of the bole profile is an important tool in the forest production management, which is influenced by several factors, such as the stand conduction regime. This work aimed to evaluate two stand conduction regimes regarding the Eucalyptus urophylla bole in the southwest region of the Brazilian state, Bahia. The data used was retrieved from stands conducted under high forest and coppice regimes. The tapering models proposed by Kozak, Demaerschalk, Ormerod, Garcia and Garay were adjusted, being selected the ones that presented better performances regarding adjustment statistics and graphic analysis of residue for each conduction regime. The models selected were validated by the chi-squared test (α = 0,05). Considering the models selected, it was possible to estimate the value of the diameter along the bole of the average-tree, allowing to evaluate the bole profile for each stand conduction regime. The identity test of the models showed that the stand conduction regime affects the shape of the trees' bole, making a necessity to adjust a specific equation for each situation. The bole tends to present a cylindrical form in a stand conducted in a coppice regime and conical one in a high forest regime.

Equações de perfil do tronco avaliados para Corymbia citriodora Hill & Johnson

“…Ressalta-se que, dentre as versões testadas dos modelos de Kozak, Ormerod e Demaerschalk, o modelo 32 foi melhor que o 3 (Kozak), o modelo 6 foi melhor que o 33 (Ormerod) e o modelo 2 foi melhor que o 31 (Demaerschalk). Também, se observa na Tabela 1 que houve variação no EPR (4,20% a 8,63%) bem menor do que foi constatado em alguns estudos brasileiros que avaliaram estes modelos, onde houve variação de 3,93% a 14,82% (Andrade, 2014;Azevedo et al, 2017;Souza et al, 2018;Farias et al, 2019).…”

“…Neste sentindo, os estudos brasileiros sobre equações de perfil do tronco de árvores deram maior enfoque em plantios com eucalipto (Ribeiro & Andrade, 2016;Azevedo et al, 2017;Cerqueira et al, 2018;Souza et al, 2018;Farias, Marcos & Natalia, 2019); com pinus (Fischer et al, 2001); com outras espécies (Muller et al, 2014). Há, ainda, que se reportar aos trabalhos feitos em floresta nativa (Lanssanova et al, 2013;.…”