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A comparative analysis among the physical and chemical parameters of water and soil quality and of Environmental Fragility of the watershed of stream Lavapés – Sorocaba/SP was carried out. The study area has remnant forest patches and urban increasing. We quantified fifteen physical, chemical and hydraulic soil parameters. Monthly and during on year we collected water samples an in situ complementary information, in order to check the local water quality. Sixteen physical and chemical parameters of water quality we analysed. An Environmental Fragility map was elaborated through from a method of map overlaying. The study area presented very low Environmental Fragility (73,3% of its area), indicating low propensity to severe erosion processes. Soil presented better environmental conditions in areas covered with forest vegetation. There was not verified great change in the textures of the soils from different land covers. The parameters electric conductivity, porosity, carbon and nitrogen were higher in areas of vegetation. The compaction was higher in exposed soils than it was in the other land covers. The “urban areas” was presented higher data heterogeneity of soil quality, because of the great quantity of exogen materials searched with the samples of soil. The water samples pointed a worsening in the quality of the stream Lavapés, between the sampling point next to the head of the river and the sampling point next to the mouth of the river. There was not verified great seasonal influence in the ionic behaviour of the watercourse. The output rate of nutrients by the stream Lavapés presented low influence to the river Sorocaba. The stream Lavapés was in mesotrophic state. The integrated analysis of the residuals of tendency surfaces of the parameters magnesium, phosphorus and calcium, with the study area hydrography indicated that the soil contributes with the concentration of those ions in the stream Lavapés. The multiple regression of the tendency surfaces of the parameters compaction, porosity and carbon, with the map of Environmental Fragility presented coefficient of determination R2 = 0,93, pointing the relationship between these parameters and the erosive susceptibility of the watershed of stream Lavapés.

Fragilidade Ambiental, Qualidades do Solo, da Água e Ocupação Urbana na Microbacia do Córrego Lavapés – Sorocaba/SP