ABSTRACT Although the physical environment of the Atlantic Forest realm is well known, studies on the soil-landform relationships are fundamental to improve the management of soil resources to facilitate sustainable development. The purpose of this study was to evaluate a representative topossequence on the “Mares de Morros” landscape of deeply weathered regolith on leucocratic granite rocks and demi-orange convex slopes. The soils varied along the topossequence according to drainage and were classified as Acrudox, Pseudogleysol, and Epiaquent. The clay fraction […]

Detailed chemical and crystal properties of the kaolinite (Ka) and iron oxides in the Barreiras Group soils and sediments (Coastal Tablelands) are little known. Eleven samples were collected (0,7; 1,4; 2,1; 2,8; 3,5; 4,2; 4,9; 5,6; 7,7; 10,5 and 14m) in an exposed sediment sequence in Aracruz, Espírio Santo State, Brazil, in order to study the characteristics of these minerals with depth. Clay and silt fractions were studied by X-ray diffraction (XRD), differential thermal analysis and electron microscopy. Total contents […]

To study iron and aluminum oxide characteristics, samples of soils developed from different parent materials and with different development degrees were selected and collected from MG, ES, RS and RR states. The clay fraction was analyzed by X-ray diffraction (XRD), differential thermal analysis, thermogravimetry and electron microscopy. Al, Si and microelement contents were determined from ammonium oxalate (Ox) and dithionite-citrate-bicarbonate (DCB) extractions. Overall, goethite (Gt) was the main iron oxide in the clay fraction. Only the soils developed from basalt […]