O efeito do solo, inundação e topografia sobre as campinaranas inundáveis na Amazônia

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

06/05/2011

RESUMO

Little is known about the factors that determine the spatial variation in structure, floristic composition and diversity in the Amazon Campinaranas. The Campinaranas are characterized by predominantly oligotrophic sandy soils. In the Negro River basin, they occur in a mosaic of grassland formations, forest and savanna, often associated with flooding. To infer how these factors determine the variation in vegetation types, we investigated the magnitude of the effects of soil, topography and flooding on the floristic composition and structural variation of the Campinaranas in Viruá National Park located in the state of Roraima. The floristic and structural variation in the northern Amazon Campinaranas were strongly determined by the texture and fertility of sandy soils. On the other hand, the maximum level of flooding during the rainy season had a low effect on the floristic composition and structure gradient in the study area. In the case of an extensive plain, little topographic variation was not sufficient to determine the floristic and structural patterns of vegetation. So despite the soils are predominantly sandy and oligotrophic, variations in texture and fertility explained the changes in structure and composition of Campinaranas flood. Our study suggests that there isn`t a clear floristic distinction between the forested Campinaranas and Igapó. It should be noted that not all forested Campinaranas were flooded. Other studies on the variation of groundwater and flood pulse in the Amazon flood Campinaranas should be conducted to clarify the relationships between environment and vegetation.

ASSUNTO(S)

comunidade arbórea vegetação alagamento ecologia de comunidades diversidade beta amazônia campinarana inundável recursos florestais e engenharia florestal

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