Dinâmica e produção de uma floresta sob regime de manejo sustentável na amazônia central

Abstract

Dynamic and production of a forest under sustainable management in central amazon. Evaluated the short effects and medium term of polycyclic silvicultural system, dynamics and production, in a dense rain forest in the state of Amazonas, based on three Annual Production Units (APU) of the forest management area of the company Mil Madeiras Preciosas in Itacoatiara, AM, explored between the years 1996 to 1998, with an average exploitation intensity of 20,02 m3.ha-1. The continuous forest inventories were done before and after logging in 1996, 1997, 1998, 2001 and 2014 in 41 permanent plots of 1 hectare where all trees with DAP equal to or greater than 15 cm were measured. The presence of 195 species was recorded, being 55 commercial. On average values, before the logging, 297.65 trees.ha-1 were recorded, equivalent to basal area of 26.42 m2.ha-1 and the volume of 393.62 m3.ha-1. The forest showed average rate of 3.20[%] year-1, and 1.47[%] .year-1 mortality. Considering only the species of commercial value, the rates were 2.50[%] .year-1 and 1.30[%] .year-1 for admission and mortality, respectively. The increase in volume was 4.63 m3.ha-1.year-1, of which 1.69 m3.ha-1.year-1 commercial species. The forest studied had stocks in basal area and volume of the total population and commercial species, equivalent to those recorded before the logging, indicating that the applied shear intensity is favoring the recovery of the timber stock into a second cutting cycle.