Contribuição para a implantação de PSA na Sub-bacia do Ribeirão Santa Maria, município de Couto Magalhães - Tocantins

Abstract

The demand for water resources has driven the creation and diffusion of instruments in order to decrease the degradation of watersheds and ensure greater supply of environmental services. With that, is increasing worldwide and national programs and projects also payment for environmental services – PSA who seek financially compensate producers of environmental services. Many of these initiatives already carried out PSA seek to adopt criteria that assist in the estimation of amounts to be paid, so there's a concern in the creation, adaptation and innovation of methodologies and techniques that support to raise potential producers of SA and compensate them. In this work, the objective was to identify the farms with the highest potential for providing environmental services in the whatershed of the Ribeirão Santa Maria in Couto de Magalhães, Tocantins, starting with the geographic information system support for database generation, maps and spatial analysis. It was possible to characterize the whatershed of study and draw up a map of PSA deployment allowance, based on data from: Hydrography, hipsométrico, slope, geology, soils, land cover and land use, susceptibility to erosion and zoning of potential areas for environmental services. The maps were drawn from the definition of criteria already used in PSAs, as experiences of other authors. In the whatershed of the Ribeirão Santa Maria were identified four potential areas for environmental services, being the most and the least favourable to services respond, respectively, for about 44 and 33% of the total properties. One of the factors analyzed that more contributed to the finding of these situations was the vegetation cover.