Influências do relevo e solo na estrutura da vegetação arbórea em uma área de transição entre floresta estacional decidual e cerrado sentido restrito, Lagamar-MG

Abstract

Areas of ecological tension are formed by the meeting of two different vegetation types, as in this division and especially the reasons are poorly understood. On a local scale can be difficult to demarcate the types of physiognomy. The aim of this study was to clarify the difference between the Tropical Dry Forest (TDF) and Cerrado Sensu Stricto (CSS) and understand the effects of soil and topography on the distribution of species. The study was conducted in a remnant in the Lagamar, MG - Brazil. Sampled in 30 plots of 400 m2, all subjects with CAP larger than 10 cm. Collected soil samples and performed the topography of the land. Calculated phytosociological performed Canonical Correspondence Analysis (CCA) and Indicator Species, was also made the distribution of individuals in diameter classes. In total we found 138 species, two endangered species: Myracrodruon urundeuva and Luehea candicans. The eigenvalues of CCA were elevated and confirmed the replacement of species, forming two distinct groups. The FED of the first and the second CSR. Besides the replacement of species there is a decrease of density and height of individuals. Environmental variables: Aluminium Saturation Index positively influence the CSR; already Organic Matter and Index Base Saturation showed positive correlation with the TDF. 14 species were classified as indicative of the TDF, 17 and the CSS. Most regions of transition between forest and savana of Minas Gerais are changed. They face threats from mining or agricultural areas are turned on, so the study data form the basis for public policy and for revegetation of these environments.