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Partitioning of pluvial precipitation in a watershed occupied by Atlantic forest in Mantiqueira range, MG state/Particao da precipitacao pluvial em uma microbacia hidrografica ocupada por Mata Atlantica na serra da Mantiqueira, MG

The analyze of pluvial precipitation and its interaction on the different hydrologic cycle phases in forested watersheds are essential in order to water balance characterization due to its relevant participation in the hydrological processes and to its spatial-temporal variability as function of eda...

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Bibliographic Details
Published in:Ciência florestal 2014-07, Vol.24 (3), p.583
Main Authors: Avila, Leo Fernandes, de Mello, Carlos Rogerio, Pinto, Leandro Campos, da Silva, Antonio Marciano
Format: Article
Language:Spanish
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Summary:The analyze of pluvial precipitation and its interaction on the different hydrologic cycle phases in forested watersheds are essential in order to water balance characterization due to its relevant participation in the hydrological processes and to its spatial-temporal variability as function of edaphic, topographic, climatic and vegetation elements. Due to heterogeneity of Atlantic Forest associated to temporal and spatial variability of pluvial precipitation regime, the study of mechanisms that allow describing and linking the hydrological cycle elements are very important. This way, the objective of this study was to analyze the partitioning of pluvial precipitation at a micro-catchment entirely occupied by Atlantic Forest remnant, in Mantiqueira Range, during 2009/2010 and 2010/2011 hydrological years, relating it with the seasonal evolution of this ecosystem which was monitored by the application of normalized difference vegetation indexes (NDVI). It was observed greater percentage of internal pluvial precipitation during the periods with less rainfall. It was also verified greater water storage capacity of the Atlantic Forest's canopy throughout rainy season. Yet, a plausible correlation was obtained between water storage capacity of Atlantic Forest and the regeneration of vegetation demonstrated by NDVI what can be associated to the processes responsible for Atlantic Forest's growth. Keywords: NDVI; interception; pluvial precipitation; canopy forest. A analise do comportamento da precipitacao e sua interacao nas diferentes etapas do ciclo hidrologico em bacias hidrograficas florestadas sao essenciais para a determinacao do balanco hidrico, devido a sua relevante participacao nos processos hidrologicos e a sua variacao espaco-temporal em funcao de fatores edaficos, topograficos, climaticos e de vegetacao. Devido a heterogeneidade da Mata Atlantica, aliada a variabilidade espaco-temporal da precipitacao, tornam-se fundamentais mecanismos que permitam a descricao, bem como a interligacao dos componentes do balanco hidrico nesse ambiente. Nesse contexto, este estudo foi realizado com o objetivo de analisar a particao da precipitacao pluvial em uma microbacia hidrografica inteiramente ocupada por um remanescente de Mata Atlantica, durante os anos hidrologicos de 2009-2010 e de 2010-2011, correlacionando-a com a evolucao sazonal dos ecossistemas, identificada pela aplicacao das diferencas dos indices de vegetacao por diferenca normalizada (IVDN). Observou
ISSN:1980-5098