Estimação de modelos volumétricos para espécies florestais de uso comercial em Paragominas, PA.

Abstract

The information base alongside the development of this work was obtained in a stand of rainforest dense, located in the farm Rio Capim, owned to the Cikel Brasil Verde Madeiras Ltda., in the town of Paragominas, Pará State, consisting of 234 samples-trees, which were selected according to the economic interest of the company at the time of forestry, determining the number of trees for especies, which were distribulted in to 7(seven) diametric classes, with amplitudes of 12 cm, 49 cm in the range of up to 127 cm. In each samples-trees was determined the real volume using the methodology proposed by Smalian, measuring the circumference in the sections of 2m on 2m and determining the DAP and its commercial real height. Volumetric models were adjusted with single and double entry, in order to select the model with best setting and accuracy, based on the following selection of criterion value of statistical F and significance level; a higher coefficient of determination (R²), lower standard error of estimate in percentege (Syx), consequently lower coefficient of variation (CV) analysis of waste through the Middle Deviation Percentage (DMP). Based on these criterion, concluded that the best model to be employed on the farm Rio Capim was with Schumacher-Hall for presenting the best result for the volume estimated with shell, by method of Smalian, because it showed greater accuracy for estimating the volume depending on the diameter and total height of trees, which the equation is selected and recommended for the study area.