Crescimento volumétrico de Gmelina arborea Roxb. ex Sm na região sudoeste do Paraná

Abstract

The use of exotic species in Brasil has been increasing in recent times, aiming to offer alternative wood products and even reduce deforestation of native forests that are not subject to sustainable management plans. Therefore, the objective of this work was to evaluate the volumetric growth of the exotic species Gmelina arborea Roxb. ex Sm, demonstrating its potential for use in forest management for the Southwest region of Paraná. With the analysis of the complete trunk of 5 arboreal individuals, the data were calculated volume (m³), annual increment (ICA) and mean annual increment (IMA). Later, 3 models were tested, using the Microsoft Excel solver function. The individuals of Gmelina arborea under study, their ages varying from 23 to 27 years, presenting volume values (m³), from 0.157 to 0.6267 m³ between each tree sampled. However, Gmelina arborea had an average ICA of 0.0256 m³ / year and an average IMA of 0.0127 m³ / year. In the study, tree age 2 was the technical cutting age (ITC) at the age of 21 years of the individual, ie the time to perform the cut. Among the models tested, the one that presented greater representativity to the volume of the species was the Model MMF, with low dispersion of the residues, presented values of more coherent evaluation parameters for the volume estimate for the species under study. In order to better describe the production and growth of Gmelina arborea in Brasil, it is indicated to seek plantations of the same or even to sample individuals that had some silvicultural intervention, mainly at commercial level.