Fatores responsáveis pela dinâmica dos movimentos de massa do solo em um sistema pedológico de Umuarama-PR

Abstract

This work was developed in the county of Umuarama, in the northwest of the state of Paraná, in the morphologic compartment of Xambré river. It presents short hill slopes, cut by baselines, where problems of erosion are common, associated with stormwater runoff, which generate soil mass movements (landslides), mainly on slopes breaks. In view of the above, the study aims to identify the factors responsible for the soil mass movements, existing in the geomorphological compartment, through the macro and micromorphological results and the physical-hydrical results, obtained during a lateral sequential of soils, representative of the hill slopes and of the interfluves of the area, called São José toposequence, which is made up of two distinct sets of soils, divided by a distinctive concave slope break. These two distributed pedological systems, respectively upstream and downstream of the slope break, present different water resource management and are closely associated with the slope gradient and the slope shape as well as with the geometry and the morphological properties of soil horizons presented vertical and laterally along the toposequence, where the slope break also dissociates distinct pedogenetical processes, precisely where there is the occurrence of soil mass movements.