Avaliação dos elementos anatômicos em Eucalyptus sp. com lenho de tração para utilização na indústria madeireira

Abstract

The genus Eucalyptus has been widely used in planted forests in Brazil because it has advantages such as fast growth and a wide variety of species. Eucalyptus wood is intended for the manufacture of various products; however, the existence of defects, such as reaction wood, restricts its use in solid form. The objective of this work was to verify the radial variations of the dimensions of fibers and vessels at the base of a tree with reaction wood formed by the inclination of the trunk. For this, the base disc of a Eucalyptus sp. tree, approximately 48 years old, was used. Fiber length, wall thickness and fiber diameter and vessel diameter were evaluated. It was verified that reaction wood and opposite wood presented, respectively: fiber length equal to 1.05 mm and 1.04 mm, wall thickness of 6.84 μm and 8.29 μm, fiber diameter of 18.11 μm and 21.35 μm and vessel diameter of 148.7 μm and 157.56 μm. The ANOVA indicated that only the wall thickness variable showed a statistically significant difference between the regions studied, at 5% probability. Tukey's test revealed that the opposite wood and the tensile wood are statistically different for this variable, and that in the opposite wood the fibers are thicker.