Flora e estrutura do estrato lenhoso numa comunidade de Cerrado em Santo Ant?nio do Leverger, MT, Brasil

摘要

An analysis was made of the floristic composition and structure of the shrub-arboreous layer of the "cerrado" community in Mato Grosso. A total of 131 species, 92 genera and 45 families was recorded for this area. The families richest in species were: Leguminosae, Myrtaceae, Rubiaceae, Annonaceae and Malpighiaceae, with 43% (56/131) of the species and 38% (35/92) of the genera. Date analysis about floristic similarity, by Jaccard Index (IJ) and S?rensen Index (IS), with 20 other "cerrado" (sensu lato) sites showed that the area studied has the most species in common with Mato Grosso and Pantanal vegetation. The area studied had high species diversity (H'=3,75 nats.individual-1). The structural survey recorded total density of 1,653individuals.ha-1. The most important species was Annona dioica A.St.-Hil. and the most important family was Annonaceae. The importance of the most species was litle, considering the values of density, frequency and dominance. These results, associated to the fact that the community suffer constant environmental disturbance, justify the studies and step taken of conservation in a short period of time for the studied area.