Carbon storage in soil and aggregates of Inceptisols under different land use management systems in southern Amazonas

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.

摘要 土地利用与管理系统是影响碳储量及其团聚体稳定性的关键因素。本研究针对不同土地利用与管理系统下的始成土（Inceptisols）的碳储量与团聚体稳定性展开评估。本研究在亚马孙州南部区域的5处地块开展，选取了5个采用不同传统土地利用系统的区域，分别为农林业、木薯种植园、甘蔗种植园、牧场与原生林。在每个样地中布设50米×50米的样格，以10米×10米的规则间距划分样格内区域，在0.00~0.10米深度层的每个样格内采集36个采样点。本研究测定了土壤容重、团聚体稳定性、总有机碳与碳储量。对实验数据进行方差分析（F检验），并采用Tukey检验在5%显著性水平下开展均值多重比较。研究结果表明，碳储量最高的区域为甘蔗种植园与牧场，其次依次为木薯种植园、农林业与原生林；土地利用管理系统对碳储量与团聚体稳定性均存在显著影响。