MODELAGEM VOLUMÉTRICA PARA ÁRVORES DO CERRADO NO MUNICÍPIO DE URUAÇU

Abstract

The work was carried out in a legal preservation area located around the municipality of Uruaçu. Given the importance of knowing the size of wood for the preservation area, the objective of this work was to evaluate volumetric equations that represent the size of wood in the area of preservation. preservation of cerrado plants in the municipality of Uruaçu. Thus, data from 11 species of trees in the Cerrado were identified and collected, totaling 92 trees sampled. In determining cubic units, the height of the stem and the diameters were measured at a height of 0.05 m from the ground and the height of the first bifurcation of the stem. Eighteen volumetric models were fitted to the obtained experimental data. The fit of the best model representing the volume of wood was selected using the coefficient of determination (R²), the standard error of the estimate (Syx), the mean absolute error (EM), the global percentage deviation (DG), the distribution of the behavior of the residues and the significance of the parameters of the models adjusted to 5% of probability by the t-test. The calculation of the volume of wood with bark, using the Smalian formula, obtained a total volume of 0.89 m³ per hectare. the volumetric equation that best suited was Humell's, resulting in the highest R² being 0.93, and the lowest values of 𝑆xy=0.19; MS= 1.6x10-11; DG%= 1.7x10-8 with the exception of the mean absolute error (𝐸𝑀𝑎 (%) = -3.55).