DINÂMICA PEDOGEOMORFOLÓGICA NA FORMAÇÃO FURNAS - BACIA DO RIO VERDE/ PONTA GROSSA - PR

Abstract

The dynamics pedogeomorphological enables understanding of pedomorphogenesis by the study of soil and relief in the genesis of landscapes, since they depend on the same formation factors. This study shows itself as an important tool to environmental planning. The research was conducted in the Furnas Formation occurrence area in the basin of the Verde river in Ponta Grossa (PR) with the objective to verify the pedogeomorphic behavior on the convex slopes of the Formation, according to drainage pattern and current use of Earth. Was chosen four representative toposequences of agricultural use and proceeded with the compartmentation of the slopes into three segments for the characterization of soils until the 6th categorical level. Twelve profiles were sampled at the surface and subsurface material with which routine particle size and chemical analysis were performed. The physical and chemical properties of the soil were compared between the studied slopes. In these, also, were inferred information about the evolution of the landscape. A higher variability of soils was observed in the younger erosional surfaces than in the older and depositional. The middle third and top segments of the slopes were those with higher and lower differentiation of soils, respectively. Among slopes, area 03 was the one that showed greater variability of soil. Has detected the occurrence of a reworking material from the Ponta Grossa Formation in the transition area of the two lithologies, which was responsible for the different behavior of the various attributes of the soil. There was regular decrease in pH, % of clay and base saturation, and increase, % of sand, aluminum saturation, CTC/100g of clay and the relationship silt / clay, from the most evolved soils to the latest. The identification of some factors such as: position occupied by the soil on the slope, degree of evolution of soils and formation of ferruginous crusts in the subsurface enabled the understanding of the relationship between the dynamics pedomorphogenic, mainly by sediment transport that contributes to siltation increasingly intense in rivers of this region.