利用第二次全国土壤普查资料,以安徽六安市域为例研究统计了土壤表土有机碳平均含量随土壤分类级别的变异,结果表明供试市域的土壤有机碳含量在不同分类单元层次上上存在明显差异。表土有机碳含量的变化范围介于4.58 g kg-1～60.38 g kg-1,在土种尺度上变异系数为4.29%～83.78%,土属尺度上变异系数为0.88%～120.56%;亚类尺度上为11.97%～95.37%,而土类尺度上为18.92%～95.42%。 Using the data from the Second National Soil Survey, taking the Lu’an City of Anhui Province as an example, the variation of soil organic carbon content with the soil classification level was calculated. The results showed that the content of soil organic carbon in the test area was above the level of different taxa Significant differences. The range of variation of organic carbon content in topsoil ranged from 4.58 g kg -1 to 60.38 g kg -1, with the coefficient of variation ranging from 4.29% to 83.78% on soil scales and from 0.88% to 120.56% on soil scales. 11.97% ~ 95.37% on the scale and 18.92% ~ 95.42% on the soil scale.