Sociedade & Natureza
versión On-line ISSN 1982-4513
ROSOLEN, Vania et al. Changes in the total and isotopic soil carbon after conversion from Cerrado to agricultural systems in the Triângulo Mineiro. Soc. nat. [online]. 2012, vol.24, n.1, pp. 157-167. ISSN 1982-4513. http://dx.doi.org/10.1590/S1982-45132012000100013.
The Cerrado soils suffer impacts related to the conversion of the original vegetation in agricultural systems, e.g., in the imbalances of stocks and nature of carbon. The Triângulo Mineiro region has been deforested by supporting the expansion of agribusiness and presents serious problems related to soil erosion. This study aimed to assess changes in content (Ctotal) and in nature (δ13C) of soil organic carbon after conversion of cerrado in different agricultural uses (pasture, soybean and soybean / corn), management (tillage and no-tillage). The results showed that changes in the values related to the use and management are also determined by the textural characteristics of soils formed by the alteration of different rock types. Among the different uses and management, the greater enrichment of the carbon content was determined in the no-tillage soybean / corn in a clayey soil and the further impoverishment was determined in not managed pastures developed in sandy soils from sandstones of Adamantina and Marília Formations. These studies are useful for use as quality indicators for environmental conservation.
Palabras clave : Brazilian savannah; soil organic matter; total organic carbon; carbon isotope; agricultural systems.