Restinga is a typical vegetation on quartzitic, sandy, nutrient-poor parent materials along the Brazilian coast. Soils under restinga vegetation on the Ilha do Cardoso (SP) were studied to understand their genesis and to improve the Brazilian Soil Classification System (SiBCS). Thus, a physical, chemical and detailed morphological characterization was carried out. The results evidenced aquic, sandy, very acid soils with variable organic matter content, in which podzolization is the main pedogenic process. Sulphidric materials also occur due to the influence […]

This paper deals with the genesis of hydromorphic sandy soils with spodosol morphology found in extensive flat surfaces, in which isolated zones with undulating relief emerge, containing well drained oxisols. The objective of this study was to explain the existence of pedogenetic relationship in an oxisol-spodosol system, and to verify the possible development of the sandy materials as a consequence of oxisol transformation. For this purpose, we characterized the morphology of the soils and their physical, chemical and mineralogical attributes. […]

Fragipans and Duripans are frequently found in soils developed from sediments of the Barreiras Formation, in the low coastal plateaus of northeastern Brazil. Previous studies in arid regions have attributed Duripan cohesion to the amorphous silica. However, the Duripans and Fragipans in northeastern Brazil are located in semi-arid and high annual precipitation level zones (1.500 to 2.000 mm year-1). This study, based on a detailed characterization of soils from four depressions with different sizes, aimed to propose an evolution scheme […]