伊犁可克达拉剖面有机碳、碳酸钙分布特征及其环境意义

选取位于新疆伊犁塔克尔莫乎尔沙漠中部的可克达拉剖面作为研究对象,分析了该剖面不同深度土壤有机碳和碳酸钙的组成变化。该剖面的土壤有机碳含量变化范围为1.02g/kg～4.97g/kg,平均值2.52g/kg,标准偏差1.04g/kg,变异系数41.3%;碳酸钙含量变化范围为8.71%～15.99%,平均值13.44%,标准偏差1.94%,变异系数14.4%。整个剖面有机碳的含量较碳酸钙的含量有较大的变化,二者随剖面深度变化的总体趋势比较相似,但仍有较大差异。对有机碳和碳酸钙含量进行相关性分析,通过了0.01极显著水平的检验,呈正相关,相关系数R2=0.498。结合两种物质在剖面不同深度的含量变化,探讨了它们所对应的环境信息;结果表明有机碳、碳酸钙含量变化可以作为分析沙漠古环境的有效代用指标。

The Distribution characteristics and paleoclimate significance of the total organic carbon and calcium carbonate of the Kektala profile,Yili,Xinjing

Kektala profile locates in the central of Takermohuer desert in Yili of Xinjiang.The content changing of soil organic carbon and calcium carbonate in the different depth of the profile was analyzed.In this profile,the range of organic carbon content is 1.02g/kg~4.97g/kg,average is 2.52g/kg,standard deviation is 1.04g/kg,coefficient of variation is 41.3%;the range of calcium carbonate content is 8.71%～15.99%,average is 13.44%,standard deviation is 1.94%,coefficient of variation is 14.4%.The organic carbon content has more and greater changes than calcium carbonate content in the entire profile,their changes trend is similar,but still different.The associated analysis result of organic carbon and calcium carbonate content is positive correlation and the test of the significant level(0.01)is true,its R2 is 0.498.According to the content changes of organic carbon and calcium carbonate in the different depth of the profil,we discussed the environmental information what they reflect.The result is that the content changes of organic carbon and calcium carbonate can be used as the effective proxy to analyze the paleoenvironment of desert.