Avaliações de métodos para redução de rachaduras de topo de toras de Eucalyptus grandis W.Hill ex Maiden

Abstract

The present study was aimed at determining slaughter techniques of Eucalyptus grandis and the effect of protection and prevention of cracks top of logs. We sought to assess whether there was a reduction of tension cracks in the internal growth of Eucalyptus logs determining the best technique that has cracks reduction. Therefore, we used 63 trees were five years old, with a diameter at breast height (DBH) ranging from 10 to 24 cm, from a stand of Eucalyptus grandis wood belonging to the GM, located in the municipality of Reserve Iguaçu , an area that has an average elevation of 900 meters and climate Cfb. We evaluated two techniques of relaxation of tensions over the growth control (normal slaughter) and their interactions with three protective treatments top the log, and all the trees were felled using a chainsaw, relaxation techniques for stress growth in standing trees were applied to girdling girdling conventional and chemical protection methods and top logs were used metal connectors, industrial silicone and control (unprotected top of the log), so the experiment evaluated the interaction techniques relaxation of growth stresses protection methods with top of the log. With a escalímetro, the largest cracks were measured at the top of the logs. These logs evaluated for 72 hours. The results indicate that the techniques of relaxation of tensions influenced the reduction of internal stress cracks growth. The top methods of protection of logs did not differ statistically between themselves, but show a tendency to contain internal tensions actions of growth. We realized using metal connector as protection method stabilizes the top he shares the cracks. Shares of internal tensions growing acted until their total stability at 48 hours after his overthrow.