CONSIDERAÇÕES SOBRE AS ALTERAÇÕES DE UM FRAGMENTO FLORESTAL ÀS MARGENS DE UMA REPRESA NO MUNICÍPIO DE GUAIÇARA, SP, A PARTIR DA ANÁLISE FLORÍSTICA E FITOSSOCIOLÓGICA

Abstract

In the processes of vegetation recomposition at the banks of rivers the type of environment determined by different flooding or soaking capacities must be considered. It is questioned if the concerns are the same at dammed rivers banks. The aim of this study, considering the floristic characterization and the arboreal vegetation abundance in a seasonal forest fragment located at the banks of a dammed river that has been flooded for 40 years, was to discuss if the forest that one day was distant from the river became riparian with the approximation of the dammed water. The study was carried out in a forest fragment located at the banks of Canjarana stream, Guaiçara town, SP. In the arboreal vegetation sampled, 54 parcels of 100 m (10 m x 10 m), it was found 752 individuals belonging to 36 species. Myracrodruon urundeuva represented 56% of the total abundance. This high inequity due to the high relative density of that species, not common in riparian vegetation, allows interpreting the vegetation as a seasonal forest which did not experience the action of the soil flooding but can have experienced the action of sugar cane plantation as agricultural activity or animal rearing. The characteristics of the sampled soil confirm the supposition that there was not water infiltration from the dammed river through a side dislocation, keeping the previous soil situation. In this way it can be concluded that in processes of dammed river banks vegetal recomposition in areas adjacent to the fragment studied and with similar physical conditions it is not necessary the concern of searching for species adapted to the environment by the river banks.