ANALYSIS OF THE POROUS AND HYDRIC SYSTEM FROM A SLOPE COMPOSED OF “LATOSOL/NITOSOL”

Abstract

Aiming to corroborate with the discussions about the hydric dynamics of the soils, the research was conducted on a representative slope of the plateau of Marechal Cândido Rondon town, located in the west region of Paraná State. For this recognition, not only systematized probings were done along the slope, but also analysis were made of two trenches respectively on the top and in the middle low slope sectors, which were carried out for the macromorphological description and the samples collection in order to conduct physical, hydric and micromorphological analysis of the horizons. In the top sector it was found the Oxisol (Rhodic Eutrudox), and from the middle sector the Ferralic Nitisol (Rhodic Hapludox). Micromorphologically, the horizons Ap and Bw present closed and/or open porphyric fabric and enaulic fabric. In the enaulic zones, the interaggregated pores with high connectivity predominate - compound packing porosity, and in the porphyric zones cavities and planar pores form the porosity. The AB and B nitic horizons predominantly present closed porphyric fabrics, which make them less communicating. In these horizons, in some isolated sectors, the enaulic fabric was also identified. In hydric terms, it was observed that the horizons Ap and Bw have shown higher hydraulic conductivity in comparison to the AB and B nitic horizons, so it can be concluded that the pores arrangement directly interfere in the hydric behavior of the pedological system.