Estrutura e dinâmica da regeneração natural em Floresta sob manejo de impacto reduzido, Belterra-PA

Abstract

Knowing which species in the natural regeneration and that will probably make the wood stock for the next 27 cutting cycle is essential to define the guidelines of forest management. To that end, we aimed to evaluate the 28 structure and economic potential of the natural regeneration of an area under management. The study area is 29 located in the Tapajos National Forest, located at kilometer 68 of Highway Santarem-Cuiaba. Two Annual 30 Production Units (UPA) were used, with a total area of 1600 ha. These were allocated randomly 80 permanent 31 plots (PP) of 100 m² for saplings, 80 PP 25 m² for rods and 80 PP of 5 m² for seedlings. The plots were 32 measured on three occasions (before, two and five years after harvest). In the floristic composition from the first 33 measurement to the last, entered 9 families, 16 genera and 12 species. The diversity index and the number of 34 subjects remained in balance, with no reduction in the number of species in monitoring periods. Peruana (not 35 identified) and Jacamim (Aspidosperma inundatum) are the most important species in the natural regeneration in 36 terms of number of individuals. The species classified as commercial potential and together represent 37 approximately 46% of the total natural regeneration, five years after the timber harvest. Only ten species 38 contributed approximately 50% of individuals in regeneration. The timber forest management conducted in the 39 area did not affect the development of regeneration nor provoked the opening of large clearings.