Carbono no solo, acúmulo e qualidade da serapilheira em sistemas de produção familiar

Abstract

In the Amazon, the conversion of forests into agricultural ecosystems has been characterized by a reduction in carbon stocks in vegetation, which does not align with the principles of sustainability. The aim of this study was to evaluate the impacts of soil use by family farmers in soil carbon stocks, quantity and quality of litter accumulated. Forms of use were evaluated: SAF = agroforestry system, PA = pasture, RT = stump field and MA = preserved forest, all about Quartzipsamment. In each system were collected seven samples of litter and soil at depths of 0-5, 5-10, 10-20 and 20 - 40 cm in July 2010 and January 2011. The contents of macro and micronutrients, C/N ratio, lignin, polyphenols and carbon in the litter and soil were analyzed. Among the anthropogenic systems the SAF system presented higher litter production, accumulation of nutrients in the residues in these two periods of collection and increased carbon storage in the soil during the dry season. However, their residues were more recalcitrant than those of the MA and PA treatments.