Hypsometric relations for Eucalyptus urophylla scheme conducted under tall trees and coppice in southwestern Bahia

Abstract

The knowledge of tree height is of fundamental importance to obtain volume estimates of forest stands. Their estimative using hypsometric equation is increasingly frequent during the forest inventory. This study was conducted in the municipality of Vitoria da Conquista-BA, and aimed to adjust and select adequate mathematical models to estimate the variable total height (Ht) in two Eucalyptus urophylla plantations, conducted under regime of high forest (first rotation) and coppice (second rotation). Were evaluated eight mathematical models. The best models were selected by the coefficient of determination (R²aj%), standard error of estimate (Sy.x), the coefficient of variation (CV%), the F value, the score pondered value of the statistical parameters (VP) and graphical analysis of the distribution of residuals. In the area under regime of high forest the models of Henricksen and Parabolic were the more indicated for estimating the variable total height in function of the variable DAP. For the area under the coppice regime, Prodan’s model was the more indicated.