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The present paper has as a theme the geoenvironmental zoning of hydrographic basin aflluents of the Ibicui River, in the southwest of Rio Grande do Sul state. The methodology used includes thematic mappings with the aid of SIGs (Geographic Information Systems), field and laboratory works that serve as basis for the zoning. The data collected indicates yet that the zones of higher fragility occur in the Sanga da Areia System, where sand flats and gully erosion are frequently developed, and where the first plantings of exotic arboreal species are being identified. Stands out the contribution of the native vegetation, where it is immediately suggested, due to the pressure of monocultures, the preservation of the butia-anao unity, endemic species of the Pampa Biome.

Zoneamento geoambiental no oeste do Rio Grande do Sul: um estudo em bacias hidrográficas em processo de arenização