中文摘要：

选取环青海湖高寒湿地土壤为研究对象，对不同深度土壤有机碳含量的变化特征和不同植被类型土壤有机碳含量的分布差异进行了研究。结果显示，环青海湖区土壤有机碳0～10cm表层含量最高，均值为28．2g／kg，随着土层深度的加深其含量逐渐降低。10～20、20～30和30～40cm土层的有机碳平均含量依次为20．1、16．3和12．1g／kg；整个研究区0～40cm土壤有机碳平均含量仅为19．2g／kg。不同植被类型下土壤有机碳含量的垂直分布总体可分为两种类型：一是由高到低的递减变化；二是低-高-低型。不同植被类型的土壤有机碳含量依据均值间差异可以分为两组：华扁穗、紫花针茅和芨芨草3个植被类型为一组；垂穗披肩草、矮嵩草草甸和冰草为一组；前者植被类型土壤有机碳平均较后者要低，其平均含量分别为16．6、16．8、19．5、21．6、27．3和27．1g／kg。

英文摘要：

This paper studied the characteristics of soil organic carbon （SOC） content variations under different depths among different communities in alpine wetland soil around the Qinghai Lake. Results showed that SOC content under the 0-10 cm layer was the highest around the Qinghai Lake area, with the mean of 28.2 g/kg, and SOC content was gradually decreased with the increase of soil depth. The average contents of SOC in 10-20, 20-30 and 30-40 cm soil layer were 20.1, 16.3 and 12.1 g/kg, respectively; the average content of soil organic carbon under 0-40 cm soil layer throughout the study area was only 19.2 g/kg. The vertical distribution of the whole SOC content under different vegetation communities could he divided into two types： first one, the decline from high to low change; second, low-high-low type. The analysis of variance between different communities of SOC content indicated that SOC content among different vegetation communities based on the difference of SOC mean content could be divided into two groups： the first group included Blysmus sinocompressus community, Stipa purpurea one and Achnatherum splendens one; second group was Elymus nutans community and Kobresia humilis meadow one and Agropyron cristatum one. SOC content in the former group community was lower on average than the latter, average SOC content in six communities were 16.6, 16.8, 19.5, 21.6, 27.3 and 27.1 g/kg, respectively.