活性有机碳作为土壤有机碳中活性最强的部分,它比土壤有机碳更敏感于环境的变化。通过野外径流小区观测和室内分析,研究了侵蚀对土壤活性有机碳的影响。结果表明,土壤和泥沙中活性有机碳含量分别在0.15～0.34g/kg和0.28～2.92g/kg之间;坡度≤20°时,活性有机碳的流失量随着坡度的增加而增加;其富集比介于3.25～8.47,且随着侵蚀强度和坡度的增大均减小。泥沙中活性有机碳含量随着侵蚀强度的增加呈对数递减趋势,而活性有机碳流失程度则相反。 As the most active part of soil organic carbon, activated organic carbon is more sensitive to changes in the environment than soil organic carbon. The effect of erosion on soil active organic carbon was studied through field runoff and indoor analysis. The results showed that the contents of active organic carbon in soil and sediment were between 0.15-0.34 g / kg and 0.28-2.92 g / kg, respectively. When the slope was less than 20 °, the loss of active organic carbon increased with the slope increasing. The enrichment ratio ranged from 3.25 to 8.47 and decreased with the increase of erosion intensity and slope. The content of active organic carbon in sediment decreases logarithmically with the increase of erosion intensity, but the extent of active organic carbon loss is opposite.