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对霍山县第二次土壤普查历史记载资料和2005-2008年耕地监测资料数据进行了统计分析。结果表明,20年来该县农田表土有机碳含量明显提高,显示农田土壤的有机碳库积累。县域范围内耕地土壤有机碳含量不同尺度的变异系数介于4.53%~14.91%。村民组单元内变异性最高,乡镇间有机碳含量变异性低于行政村间变异性。因此,从县级尺度的农田土壤碳计量来说,以乡镇尺度采样研究比村级尺度可靠性较高。影响县域内农田土壤有机碳含量与变异的动力因子主要是农业利用和农田基本建设,茶、桑和水稻利用下农田土壤有机碳含量明显较高。
The second annual soil census in Huoshan County, the historical records of data and 2005-2008 cultivated land monitoring data were analyzed. The results show that the organic carbon content in the topsoil of farmland in this county has been significantly increased over the past 20 years, indicating the accumulation of organic carbon in farmland soils. The coefficient of variation of soil organic carbon content in different scales ranged from 4.53% to 14.91%. The highest variability within the villagers’ group and the variability of the organic carbon content among villages are lower than those of the administrative villages. Therefore, for the measurement of farmland soil carbon at the county scale, sampling at the township scale is more reliable than the village scale. The driving forces that affect the content and variation of soil organic carbon in farmland are mainly agricultural utilization and farmland infrastructures. The content of organic carbon in soils under tea, mulberry and paddy use is obviously higher.