Anatomia e identificação da madeira de genótipos de Eucalyptus spp. plantados no Estado de Minas Gerais

Abstract

Among the wood species with wide use in the forest products industry, the Eucalyptus genus has great relevance in the current market. The Minas Gerais state has the largest area planted of Eucalyptus in Brazil, marketed by companies for many different purposes. Currently there is a need to study anatomically genotypes most commonly used by companies, checking the differences within that genus which has similar characteristics among the species. The present study aimed to characterize and identify anatomically some genotypes of Eucalyptus L'Herit. planted in the Minas Gerais state. For wood anatomy and identification of genotypes were used as anatomical procedures described in IAWA (1989) and scanning electron microscopy to measure the diameter of the intervascular pits. Six genotypes were collected. Of each genotype were used three trees and pulled out a disc, in the diameter at breast height - DBH of each one. Of the discs were removed three test samples in the pith-rates. There was significant radial variation in the analyzed variables. Growth layers, axial parenchyma and radial parenchyma allowed the genotypes separation; intervascular pits are small in all genotypes. Despite the similarity between the genotypes was possible to distinguish them by means of qualitative characteristics.