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以皖北平原典型农业生产大县亳州市蒙城县为代表,运用统计学、地统计学方法和GIS技术研究了其农田耕作层(0～20 cm)土壤有机碳(SOC)含量的空间分布及其影响因子。结果表明:研究区SOC含量为10.41±2.52 g kg-1,近30年来提高了55.61%,SOC变异系数为24%,属于中等变异程度。SOC含量在空间分布上表现为东北部、中部和西南部含量高,由西北向东南先逐渐增加后逐渐降低,变异程度较高。整个县域范围内SOC空间变异的主要影响因素为土壤机械组成(粉粒和砂粒含量),其次为秸秆还田。
Taking Mengcheng County of Bozhou City, a typical agricultural production county in the North Anhui Plain, as an example, the spatial distribution of soil organic carbon (SOC) content in cultivated layer (0 ~ 20 cm) of farmland was studied by using statistics, geostatistics and GIS techniques And its impact factor. The results showed that the SOC content in the study area was 10.41 ± 2.52 g kg -1, 55.61% in the past 30 years, and the coefficient of variation of SOC was 24%, which belonged to the medium degree of variation. The content of SOC in the spatial distribution of the northeast, the central and southwest high content from northwest to southeast gradually increase gradually decreased, the degree of variation higher. The main influencing factors of SOC spatial variability in the whole county area are soil mechanical composition (silt and sand content), followed by straw returning.