Influência antrópica em ecótonos floresta e campo da Mata Atlântica do Brasil: análise de micropartículas carbonizadas em solos superficiais

AUTOR(ES)

Maria da Glória Silva Bispo Passacantili

DATA DE PUBLICAÇÃO

2008

RESUMO

The objective of this study was to quantify, through the charred particles technique, the occurrence of fires in three areas of the Atlantic Rainforest of Southeastern Brazil, characterized by the presence of a forest/savanna mosaic. These fire events have been correlated with the physiognomy of the local vegetation in order to test three hypotheses related to the presence of savannas within forest areas, in which the climate is conducive to the presence of forest. The studied sites are located in the Curucutu Nucleus of the Serra do Mar State Park, in the southern limits of the city of São Paulo, São Paulo, Brazil; in an area adjacent to Curucutu, along the trails of the Sorocabana Railway (EFS), in the border of the cities of São Paulo and Itanhaém, and in the Forest Reserve of the Vale do Rio Doce Inc., in Linhares, State of Espírito Santo. The charred microparticles, found on superficial soils, were quantified in three size categories: <25μm; between 26 and 50μm and >51μm. The data suggest that the three studied sites have been subjected to modern fires, which occurred in both forest and savannas areas. Of the three studied areas, the savannas of the Linhares Forest Reserve appear as the most affected by fires, in an order of magnitude until to 10 times that of the Curucutu Nucleus, however, these forests. On the other hand, two forest localities of the EFS showed high fire regimes in recent times. The results suggest that although fire can be a determining factor upon the physionomy of the vegetation, there is no evidence to support the hypothesis that their forest/savanna mosaic can be explained explained only by the incidence of antropic impacts, in the form of fires. We also conclude that although fires is not a determingin factor in the vegetation type of an area, it can affect the processo of plant succession and delay the natural regeneration of forests

ASSUNTO(S)

geociencias charred particles forest savanna campo atlantic forest fogo carvão floresta atlântica fire floresta micropartículas

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