Comparação entre extensômetro e paquímetro para determinação das tensões de crescimento em árvores em pé de Eucalyptus tereticornis Smith

Abstract

The gender Eucalyptus sp, suffers a lot from the growth stresses generated in its wood, however these are in balance, however, when the trees are felled, such stresses are released causing defects that decrease their use, such as cracks, warping and brittle heartwood. The growth stresses originate in the exchange region, after the consecutive deposition of new layers of cells during the growth of the plant. The objective of this work was to measure the longitudinal residual deformations, generated by the growth stresses with the Extensometer device (CIRAD Fôret), as well as to measure them with the caliper. The study was carried out in a plantation of Eucalyptus spp. at the Federal Technological University of Paraná, in the municipalityof Dois Vizinhos-PR, 3 trees with diameters of 26.41 cm, 25.46 cm and 22.28 cm were studied, respectively for trees 1, 2 and 3, all with surrounding age of 17 years, with the measurements of longitudinal residual strain performed on standing trees. Through the results obtained in this work it was observed that the extensometer is a reliable device for obtaining longitudinal residual deformation, easy to handle and presents precise values when compared to the caliper, which did not present reliable values.