Composição florística das APPs em rede de drenagem nos municípios de Juramento e Patis, na bacia hidrográfica do rio São Francisco, MG

Abstract

Florístic surveys were carried out in riparian permanent preservation areas (APPs) disturbed, in Patis and Juramento counties, sub-basin SF10, in the hydrographic basin of São Francisco river, Minas Gerais. The objectives were: to characterize different types of rivers (ephemeral, intermittent and permanent) and their APPs; to know the floristic composition of the studied areas, comparing the riparian species according to draining river regimen, buffer riparian areas and physiognomies ( Cerrado and Deciduous Forest); to describe the similarity between the inventoried areas and to analyze and to compare the species surveyed with the species found in forest fragments. The rivers were vectorized based on the models of height and identification of their APPs. Images of CBERS satellite were used, with space resolution of 20m, for the characterization of the riparian fragments. The random sampling was used for choosing the inventoried fragments in field and the systematic one for distribution of the parcels. The Pródan´s method was used, with 207 points quadrants. The sampled area was of 1.5 ha. In the sampled areas, 1,242 individuals were found distributed in 64 species. The result of the phytossociological analysis is evidenced the presence of some dominant and frequent species in a type of river and physiognomies. Comparing the 24 more abundant species in the forest fragments inventoried and the 24 predominant species in the riparian areas, it was evidenced that only 4 species are common. In comparison with the species with higher value indices of covering inside each fragment and in each situation, the disturbed areas presented higher indices.