Resumen
- Little is known about the sustainability of cultivation systems in the Brazilian savannas, also known as the Cerrados, despite its increasing significance for that country’s agriculture. To characterize management effects and follow alterations of organic compounds in different fractions, we studied whole- soil samples and particle-size separates from clayey and loamy Oxisols under crops, pastures, reforested sites, and savanna. We assessed soil organic carbon (¥OG), polysaccharides, and GuO oxidation products (V¥G-lignin). Few changes were found in ¥OG contents of topsoil (0-12 cm) under different land uses after 10-20 years.