以四川省雅安市和平小流域紫色土为研究对象,研究不同侵蚀强度紫色土小流域土壤有机碳分布特征。结果表明:自小流域上部向下部土壤侵蚀强度逐渐降低,土壤有机碳含量逐渐升高,且下部与上部和中部相比差异性极显著(P<0.05);小流域内同一坡面不同坡位土壤总有机碳及碳组分含量均呈现坡脚>坡顶>坡中这一分布特征。小流域内阴坡和阳坡在土壤总有机碳及碳组分含量上有显著差异,具体表现为阳坡<阴坡。小流域内不同土层深度土壤总有机碳及碳组分含量均随土层的加深而降低。研究土壤碳的空间分布规律对该区退耕还林还草工程具有重要的指导意义。 Taking purple soil in Heping small watershed of Ya’an City, Sichuan Province as an example, the distribution characteristics of soil organic carbon in purple soil with different erosion intensities were studied. The results showed that the soil erosion intensity gradually decreased from upper to lower, the soil organic carbon content gradually increased, and the difference between lower part and upper part and middle part was extremely significant (P <0.05). In different watersheds, Soil total organic carbon and carbon content show the distribution characteristics of slope foot> slope top> slope. There are significant differences in total organic carbon and carbon content between the shady slopes and sunny slopes in the small watershed, which are manifested as the sunny slopes