Determination of environmental fragility in the rio Verde basin, northeast region of São Paulo state, Brazil

Abstract

This work presents a cartographic essay to determination of environmental fragility in the watershed of the Rio Verde (SP), localized in a contact area between crystalline rocks of the Serra da Mantiqueira and sedimentary terrains of the Depressão Periférica Paulista.

Analyzed the historical-social-economic characteristics of the watershed, which is marked for the agriculture practices, principally, the connected with potato, onion, sugar cane planting, over there of livestock creation.

Mapped and analyzed about geology, pedology, drainage, hypsometric, declivities and terrain use and occupation dates, which went treatise in a SIG environment and integrated for a algorithm to arrive to a synthesis map of the fragility environmental classes in the watershed.

Then, we conclude that the major part of area formed by adding the average classes to the very high fragility classes are in the portion of the Serra da Mantiqueira – major intensity of the morphogenetic process.