Dynamic of Native forests in areas of Eucalyptus expansion in São Paulo State, Brazil / Dinâmica de florestas nativas em áreas de expansão de eucalipto no Estado de São Paulo

AUTOR(ES)

Karen Leyton

DATA DE PUBLICAÇÃO

2009

RESUMO

The expansion of the Brazilian silviculture has been developed in distinct steps, requiring a better understanding of its processes in space and time to qualify and quantify its impacts. As regards space, environmental questioning concerning the activity pushed the forestry industry for meeting environmental legislation. In Eucalyptus farms, a main concern with riparian forest remainders arises from both civil society and forest certification pressures. Accordingly, this work sought to monitor the dynamic of forest remainders and Eucalyptus farming in three watersheds where commercial forestry has been expanding in São Paulo State, making use of GIS and remote sensing techniques, and correlating information obtained with permanent preservation riparian zones. For that, it was needed to compare drainage basin delimitation methodologies (automatic, cartographic and field surveying), as well as defining methodologies for classifying land use by Eucalyptus and riparian forest remainders (satellite imagery and aerial photography). Information about drainage systems obtained automatically through digital elevation models showed displacements and inconsistencies when delimitating drainage courses in low lands. However, information showed greater standardization measuring drainage courses length when compared to the charts of the Brazilian Geography and Statistics Institute (IBGE) on a scale of 1:50,000. Forest remainder quantifications revealed the presence of Eucalyptus farming in riparian zones (permanent preservation areas under current legislation) in all three studied areas. Identified forest remainders in the sixties where later found out to be occupied by Eucalyptus farming in the eighties in the regions of Piedade and Capão Bonito, São Paulo State.

ASSUNTO(S)

sistema de posicionamento global. drainage system redes de drenagem eucalipto eucalyptus sensoriamento remoto watershed proteção ambiental permanent preservation areas Áreas de conservação bacia hidrográfica forest remainders.

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