Determinação da erodibilidade em diferentes posições topográficas e tipos de uso do solo nas sub-bacias dos rios Renato e Caiabi-MT

Abstract

The objective of this study was to determine the soil erodibility in different types of use and occupation and topographic positions (Source, Middle and Mouth) along two important subbasins located in the Middle and Upper Teles Pires, (Renato and Caiabi). Through direct methodology, soil erodibility and loss were determined using the Infiasper rainfall simulator. Through indirect methodologies, prediction models were evaluated for the determination of the K factor (erodibility), being necessary the determination of physical and chemical attributes of the soil for two systems of use and occupation: Crop (LAV) and pasture (PAS) in depths of 0 to 10 cm. The results indicate that human activities accelerated erosion processes in the region. Higher soil losses occurred mainly under the crop regime followed by pasture. The region that showed a high degree of eroded soil is located in the Middle region of the Renato River subbasin. It was found that the most susceptible regions are located in the positions of the source of the Caiabi river sub-basin and in the middle of the Renato river sub-basin.