Fragilidade ambiental, qualidades do solo, da água e ocupação urbana na microbacia do córrego Lavapés - Sorocaba/SP
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Data
2011-03-22
Autores
Urban, Rodrigo Custódio [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Este estudo teve como objetivo efetuar uma análise comparativa entre variáveis físicas e químicas de qualidade de água e solo e da fragilidade ambiental dda microbacia do córrego Lavapés - Sorocaba/SP. A área de estudo possui alguns fragmentos florestais remanescentes, e apresenta aumento de área urbanizada. Foram quantificadas quinze variáveis descritoras da situação física, química e hidráulica do solo, in situ ou em laboratório. A amostragem de água foi realizada, mensalmente, durante doze meses, em dois pontos previamente selecionados. Foram quantificados dezesseis variáveis físicas e químicas de qualidade de água. Um mapa de fragilidade ambiental a processos erosivos foi elaborado a partir de método de superposição de mapas. A área de estudo apresentou Fragilidade Ambiental muito baixa (73,33% de sua área), indicando baixa propensão a eventos erosivos severos. A análise das variáveis de qualidade de solo apresentou melhores condições ambientais nas áreas de vegetação remanescente. As variávies condutividade elétrica, porosidade, e frações de carbono e nitrogênio do solo se mostraram superiores em áreas de vegetação. A comparação dos solos expostos foi superior às dos outros usos. O uso da terra que apresentou maior heterogeneidade de dados de qualidade de solo foi a área urbana, devido a grande quantidade de materiais exógenos econtrados nos solos amostrados. As amostras de água apontaram ligeira queda na qualidade do córrego Lavapés, entre o ponto amostral próximo a nascente e o ponto próximo à foz. Não verificou-se grande influência sazonal no comportamento iônico dos cursos d'água. A exportação de nutrientes pelo córrego Lavapés apresentou baixa influência para o rio Sorocaba. O córrego Lavapés encontra-se em estado mesotrófico. A análise integrada de resíduos de superfícies de tendências das variáveis magnésio...
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. Sixteen physical and chemical parameters of water quality we analyzed. 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 servere 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 in the other land covers. The urban was presented higher data heterogeneity of soil quality, because of the great quantity of exogen materials searched with the sample 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... (Complete abstract click electronic access below)
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. Sixteen physical and chemical parameters of water quality we analyzed. 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 servere 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 in the other land covers. The urban was presented higher data heterogeneity of soil quality, because of the great quantity of exogen materials searched with the sample 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... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Qualidade ambiental, Erosão, Meio ambiente, environmental diagnosis, Urban environmental quality, Erosion susceptibility, Output rate of nutrients, Geographic information system
Como citar
URBAN, Rodrigo Custódio. Fragilidade ambiental, qualidades do solo, da água e ocupação urbana na microbacia do córrego Lavapés - Sorocaba/SP. 2011. 124 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Engenharia, 2011.