Determinação da densidade básica da madeira de duas espécies em clareiras no município de Moju-Pa.

Abstract

Young wood basic density of two tree species was studied. Their relations with trees height and the different managed tropical forest gaps environments in Moju-PA was valuated. Where collected 129 Vouacapoua americana young trees and 90 Jacaranda copaia young trees, the trees were cut at approximately lcm from soil surface. Base diameter and total height were measured. Wood basic density determination was done in the Technology Wood Products Laboratory LTPF/DQT/UFRA. In this study, were analised several regression models for stem phytomass estimation for two species, in same of them was used only the base diameter variable, in others the individual total height was included. For estimate V. americana wood basic density from the height classes, is used the cube-root equation, for J. copaia is cube model. Wood basic density of V. americana and J. copaia were influenced by distances between samples. The directions of the samples doesn't influenced wood basic density of the species, however there is relation between basic density and height growth for studied species. IV. americana and J. copaia stem phytomass was influenced by distances between samples and their directions. The equation which permits estimate phytomassa of V. americana and J. copaia from the height and base diameter is the model 12 (y= a + bx + cx² + dz + ez² + fxz + gx²z + hxz² + i x² z²). The equation which permits estimate V. americana and J. copaia phytomass, considering only base diameter was cube model (Y = a + bx+ cx²+ d°c).