Volumetria de resíduos da operação de corte em floresta manejada

Abstract

The productive potential of the forest is traditionally based on the volume of commercial bole. However, the waste produced during the cutting operation can be availed as byproducts of forest management, representing an economical alternative in timber production. Thus, the aim of this study was to evaluate the volume of waste produced during the cutting operation in a managed forest, in the city of Silves /AM. Data were derived from waste produced in a number of one hundred trees explored. In which, the residue of cutting operation was all timber located in the area of influence of the cut, including, stump with and without buttresses, base and canopy branches of the tree explored and other trees that have fallen due to the cut. The volume found for one hundred trees exploited averaged 5.49 m³, thereof 1.57 m³, compose the volume of waste produced by these trees. Concerning the total volume of sampled trees, the stump contributed 2%, the base of the crown 1.19%, and branches with 24.31%. Their average volumes were, stump 0.12 m³, base of the crown 0.42 m³ and branches, 1.33 m³. The average volumes of stump base of the crown and main branches are statistically different. The open area formed by the cutting operation was approximately 206 m², which in this area were found on average 0.59 m³ of waste clearing. The volume of generated waste by the cutting operation was 25.42 m³/ha, but considering what could be used in application of timber, like branches, canopy base and buttresses, these represented in terms of volume, 13.41 m³/ha. Moreover, the rate that relates the volume of waste for each m³ of roundwood extracted was 1.35 for waste of explored tree, and 1.76 for waste of the cutting operation. These rates were higher than that provided by the legislation which is 1:1 m³, indicating that the rate may vary for each managed area, specifically.