Evolução dos processos erosivos e aspectos granulométricos em um sistema de voçoroca no Distrito de Vila Aparecida, município de Cáceres - Mato Grosso (Evolution of erosive processes and granulometric aspects of a gully complex in the district of Vila...)
DOI:
https://doi.org/10.5935/1984-2295.20170040Keywords:
Degradação do Solo, Composição Granulométrica, Feição Erosiva.Abstract
O solo é um dos recursos naturais que o homem utiliza, sem se preocupar em vários casos com sua fragilidade. Considerando a influência do uso e ocupação da terra nas mudanças ambientais, o estudo teve como objetivo analisar os processos erosivos no Distrito de Vila Aparecida, município de Cáceres - Mato Grosso a partir do monitoramento de um sistema de voçorocamento. Os procedimentos utilizados foram: levantamento teórico-conceitual; trabalho de campo para coletas de amostras, instrumentalização da erosão pelas técnicas de pinos e estacas; análise em laboratório e trabalho de gabinete (análise e sistematização dos dados). A retirada de cobertura vegetal e a granulometria do solo no entorno da área de estudo são fatores condicionantes aos processos erosivos. Ao analisar os dados obtidos por monitoramento, nota-se que dos quatro pontos o que apresentou maior susceptibilidade foi o Ponto 1, pois apresentou alta percentagem de areias e silte. A quantificação da erosão indica processo remontante o que contribui para o aumento em área e ramificação da voçoroca. Cabe salientar ainda o papel da água ao identificar processos e feições nos trabalhos de campo, como: a) piping b) encrostamento nas camadas superficiais e c) lavagem do material.
A B S T R A C T
Soil is one of the natural resouces that humans often use without concern for its fragility. Considering the influence of land use and occupation in environmental changes, the study aimed to analyze erosive processes in the district of Vila Aparecida, Cáceres Municipality, Mato Grosso, through monitoring a gully complex. We used the following procedures: theoretical-conceptual inventory; field work for sample collection; instrumentation of the erosion by pin and stake techniques; laboratory analysis and desk work (analysis and systemization of the data). Removal of vegetation cover and soil granulometry in the surroundings of the study area are determining factors of erosive processes. Analysis of the data obtained through monitoring revealed that, of the four points, Point 1 presented the greatest susceptibility, as it presented a higher percentage of sands and silt. Quantification of the erosion indicates a headward process, which contributes to the increase in area and ramification of the gully. We should also note the role of water when identifying processes and features during field work, such as a) piping, b) crusting in the surface layers, and c) washing the material.
Keywords: soil degradation; granulometric composition; erosive feature.
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Copyright (c) 2017 Pauliane de Lima Silva, Leila Nalis Paiva da Silva Andrade, Gustavo Roberto dos Santos Leandro, Célia Alves de Souza
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