Idade técnica do primeiro desbaste de povoamentos de teca em diferentes espaçamentos

Abstract

The objective of this study was to identify the technical age for the first thinning in Tectona grandis L.f. stands considering different spacing. The data are from an experimental net of sampling plots, with areas equal to 1505 and 1548 m2, installed in two sites at Água Boa municipality, Mato Grosso state, considering twelve different spacing. Nine replications were considered per spacing, in a completely randomized design. Measurements of total height of the trees and diameter at 1.3 m in height were taken at the ages of 26, 42, 50 and 78 months. To model the diameter distribution, the Weibull function and a set of equations to estimate the values of its parameters in a future age were used. The technical age of thinning was defined based on the application of the Percentage Ingrowth Method, using the expolinear model. Stagnation of growth occurred earlier in the denser spacing, with a lower technical age of thinning, which ranged between 6 and 8 years. The percentage ingrowth method and the diameter distribution models are efficient to define the technical age of thinning in teak stands with different spacing.