Comportamento silvicultural e da qualidade da madeira de eucalipto sob diferentes arranjos espaciais em sistemas integrados

Abstract

The objective of this paper was to evaluate the silvicultural performance, wood and charcoal quality of the clone H105 (Eucalyptus grandis x E. camaldulensis), at 84 months of age in five distinct spatial arrangements in the crop and forest integration system (ILPF) , in the state of Piauí for energy purposes. The study was conducted at the Nova Zelandia farm, in the municipality of Uruçuí / PI. A randomized complete block design with three replicates and five treatments was used. The treatments consisted of five spatial arrangements, with triple lines (1.5mx1.5m) + 14m; (3mx1.5m) + 14m and quintuple lines (1.5mx1.5m) + 14m; (3mx1.5m) + 14m; (3mx2m) + 14m. Diameter at breast height (DAP), volume, dry mass, energy stock, basic density of wood, energy density, calorific value and lignin contents, total extractives, ashes, holocellulose were determined. Charcoal analyzes were also carried out, with a temperature at 450 ° C, heating rate of 1.67 ° C min, determining its energy potential. The data were submitted to analysis of variance and the means were compared by the Scott-Knott test at 5% probability. The results allowed to evaluate, in a general way, the effect of spacing on the silvicultural performance of eucalyptus in different spatial arrangements, as well as the quality of wood and charcoal. Clone H105 showed high wood productivity and spatial arrangement influenced the growth of eucalyptus. The characteristics evaluated in the wood, in particular the lignin content, presented 31.89%, identifying the potential of this clone as to its energetic purpose. It has been that the studied species presented potential for the production of energy through direct combustion and commercialization of charcoal.