Atributos indicadores de qualidade em solos de cerrado no entorno do Parque Nacional das Emas, Goiás

Abstract

Incorporation of native areas to production systems induced changes in ecosystems, especially in tropical regions, due to inappropriate land use, resulting in the rapid loss of organic carbon. This study aimed to evaluate impact of soil management and land use on biomass and microbial activity, as well as soil organic carbon and its fractions in an Oxisol and Quartzipsamment in Cerrado. Management and land use systems in Quartzipsamment were native vegetation, crop-livestock integration, pasture, no-till 1 (soybean/Brachiaria) and two no-till 2 (corn/Brachiaria). In Oxisol the systems were native vegetation, crop-livestock integration, conventional tillage, no-till 3 (soybean /radish/corn/radish) and no-till 4 (soybean/ corn/sorghum/soybean). Both soils evaluated, integrated crop-livestock improved the microbial biomass levels and soil carbon pools. In Quartzipsamment, management and land use systems not increased microbial biomass carbon, urease activity, hydrolysis of fluorescein diacetate and the carbon stock of the light fraction. In Oxisol, conventional tillage system decreased soil organic carbon and total carbon in the free light fraction soil. Furthermore, although it increased the organic carbon soil losses, the soil conservation systems enhanced the light fraction carbon in relation to native vegetation