Dinamica da comunidade arbórea em um fragmento de floresta estacional semidecidual montana em Lavras, Minas Gerais, em diferentes classes de solos

摘要

In order to analyze the existence of structural changes and the influence of different soils classes on tree community dynamics rates, a fragment of tropical montane seasonal semi-deciduous forest (8,7 ha) in SE Brazil was studied in a 5 years period (2000-2005). Data were collected in 47, 20 × 20 m, plots arranged in two 80 m distant transect, crossing the study area toward its widest length. In 2000, were surveyed all individuals with DBH > 5 cm. Species botanical identification were provided and diameters at breast height (DBH) were collected for each tree individual. In 2005, all dead trees were recorded, the surviving trees were remeasured and the recruits were measured and identified (DBH > 5 cm). Mortality, recruitments, basal area loss and gain rates were calculated for each plot, for the total area and for each soil class (Nitosols, Oxysols and Cambisols). The overall pattern in the fragment indicated reduction in number of individuals and basal area stability. However, there were no differences among soils classes regarding dynamics rates. The species populations classified as sub-canopy tended to increase its ongoing ecological dominance in the area. The results allowed us to conclude that the studied fragment is in an advanced successional phase post-disturbance and that spatial variations in dynamics rates had no relation with soils classes.