Acceso usuarios
This study investigates how horizontal granite outcrops shape adjacent soils in Esperança, Paraíba (Borborema Plateau, NE Brazil). Field GPS mapping of outcrops was combined with relief analysis (TOPODATA/INPE) and soil description/classification to the 2nd categorical level of WRB, supported by IBGE soil maps and geopedological cartography in QGIS. Three soil reference groups dominate: Neosols (Litholic and Regolithic) together cover ~80% of the municipality, reflecting shallow weathering mantles (<100 cm) and semi-arid controls that inhibit B-horizon formation; in more humid fronts, Cambisols transition to Red-Yellow Argisols with a thick textural B horizon. Results indicate relief modeling in granitic landscapes is morphogenesis-dominated, with frequent rock exposure and very shallow profiles (often ≤40 cm) on steep slopes. These patterns explain the mosaic of shallow, erosion-prone soils versus more evolved profiles where humidity increases.
