Variação da massa específica básica e dimensões celulares de três espécies florestais da região Norte de Mato Grosso

Abstract

The correct use of a material is associated with its characteristics, wood is no exception to the rule, making it important to know its variations in order to predict its behavior in different uses. In this context, this work aimed to contribute to the knowledge of the variation in the basic specific mass and cellular dimensions of the wood of three forest species in the northern region of Mato Grosso. For this, the basic longitudinal and radial specific mass and the cellular dimensions (length, diameter, width and wall thickness of the fibers) were determined, and three trees of each species were felled. A disc was collected in lengths equivalent to 0%, 25%, 50%, 75% and 100% of its commercial height, and samples were taken from each disc in positions close to the pith, intermediate region and close to the bark. The specific mass shows a decreasing trend in the longitudinal direction, while in the radial direction it tends to increase in the shell-pith direction. In general, the values obtained from cell dimensions showed the same trend as the general pattern for hardwoods. The species studied showed good indexes of the relationships between the dimensions of the fibers, which may indicate them for use in the production of cellulose pulp and paper, but for a safe recommendation for this purpose, it is important that a chemical analysis of the wood of these species be carried out.