Avaliação da densidade básica da madeira de três espécies nativas do cerrado do estado de Tocantins

Abstract

The evaluation of native species from Cerrado (a Brazilian biome) is fundamental to optimize the exploitation of new raw materials and enhance their use. The objective of this study was to evaluate the basic density from pith to bark from three native species from the state of Tocantins. We felled three trees for each species, from which it was withdrawn a disk at the diameter at breast height (DBH), taken at 1,30m at ground level. For each disk two radial profiles were taken and along each one of them three positions were sampled. Basic density of species was determined according to standard procedure, the specie Qualea sp. had the highest value (0.720 g.cm- ³) and Hymenaea sp. the lowest (0.645 g.cm-³). Only the specie Hymenaea sp. presented significant difference of the basic density between its trees. Density decreased from pith to bark in specie Qualea sp. and increased in the intermediate position in specie Emmotum sp. The density did not differ between regions along the radius in the specie Hymenaea sp. The species presented moderate basic density and demonstrated different radial density behaviors.