Fitossociologia e representações gráficas: análise da estrutura florística de algumas parcelas da Floresta Nacional Mário Xavier – Seropédica – RJ

Abstract

The Floresta Nacional Mario Xavier (Flona MX) is a protected area located at the municipality of Seropédica, metropolitan area of Rio de Janeiro State. It is the only National Forest at State, has a great importance for the conservation of the local biota, harboring endemic species of fauna, as well as offering numerous ecosystem services, has 283,794 km² área, inserted under the domain of the Atlantic Forest Biome. The present research aimed to understand the different structuring of the vegetation present at Flona MX, using phytosociology as a parameter of floristic analysis, and graphic representations, such as vegetation pyramids and phytophysiognomic profiles as a technique for characterizing the vegetation profile. The field analysis consisted in the application of Braun-Blanquet (1979) and Bertrand (1966) methodology, which helped to provide indicators of sociability, abundance-dominance, degree of cover and plant stratification of the study site, just as qualitative information and quantitative for the graphic representations of vegetation. Along the transect, it was possible to observe a significant number of exotic species, as well as the heterogeneity and good structure of the vegetation, however, with low numbers of native species of the Atlantic Forest Biome. It was also verified a high number of invasive species, some being harmful to the development of other species, requiring the insertion of new native species for greater local floristic diversity. Therefore, this research provides qualitative and quantitative information that associated with phytosociological analysis are important for the understanding of vegetation ecological behavior, serving as a subsidy for environmental management and forest management work, as well as bringing models of graphic representation of vegetation at floristic studies.