Abstract
Land use and management systems are factors that can influence carbon stock and its aggregate stability. This study assessed the carbon stock and aggregate stability of Inceptisols under different land use and management systems. The study was conducted on five properties located in the southern region of Amazonas state. Five areas were selected with different traditional land use systems (agroforestry, cassava, sugarcane, pasture and native forest). On each site, grids of 50 m x 50 m, with regular spacing of 10 by 10 meters were outlined for a sampling of 36 points in each mesh at a depth 0.00-0.10 m. We determined the bulk density, aggregate stability, total organic carbon and carbon stock. Data were subjected to analysis of variance (F test) and means were compared by Tukey test at 5% probability. We found that the highest values of carbon stocks were found in areas under sugar cane and pasture, followed by the areas under cassava, agroforestry and native forest. Carbon stocks and aggregate stability were significantly altered by land use management systems.
Highlights
To analysis of variance (F test) and means were compared by Tukey test at 5% probability
We found that the highest values of carbon stocks were found in areas under sugar cane and pasture, followed by the areas under cassava, agroforestry and native forest
Carbon stocks and aggregate stability were significantly altered by land use management systems
Summary
A conversão dos ecossistemas naturais em ambientes de cultivo vem alterando a dinâmica de carbono no solo, essas modificações frequentemente, provocam o declínio no teor de carbono (C) orgânico do solo, em função da redução do aporte, perdas por erosão e por decomposição da matéria orgânica (Hickmann e Costa, 2012). Se o agroecossistema for para fins agrícolas propriamente, é necessário considerar alguns aspectos, tais como espécie a ser cultivada, pois o tipo de sistema radicular, arquitetura da copa, aporte de resíduos vegetais e ciclo da planta, assim como aspectos ligados ao manejo, como, por exemplo, se é plantio convencional, plantio direto, rotação de culturas e cultivo mínimo interferem nos conteúdos de carbono orgânico (Zinn et al, 2005). Tais como o desenvolvido por D’Andréa et al (2004) constataram decréscimo no conteúdo de matéria orgânica do solo com o tempo de conversão floresta-agricultura. O presente trabalho tem como objetivo avaliar os estoques de carbono no solo e agregados de um Cambissolo Háplico Alítico plíntico sob agrofloresta, pastagem, cana-de-açúcar, mandioca e floresta nativa na região Sul do Amazonas de modo a fornecer subsídios ao manejo mais sustentável desses agroecossistemas na região
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