三江源区土壤有机碳空间分布及影响因素分析：以玉树县为例

Research on Spatial Distribution of Soil Organic Carbon Contents and Its Influence Factors in the Sanjiang Source Regions: A Case Study of Yushu,Qinghai Province

三江源区土壤有机碳含量空间分布研究对于全球气候变化下区域碳循环研究具有重要意义。文章以三江源区玉树县为研究区，在GIS的支持下，基于土样有机碳测试结果，利用Kriging插值方法得到土壤有机碳含量空间分布，在此基础上分析了玉树县土壤有机碳含量空间分布的主要影响因子。绡果表明：西北部的隆宝滩湿地自然保护区及其周围区域土壤有机碳含量最高，达到了90g／kg以上；玉树县结古镇、仲达乡及通天河附近为26．5—45g／kg；巴塘乡西部、下拉秀乡西南部及周边区域集中在50—75g／kg。玉树县土壤有机碳含量空间分布主要受到环境因子、土壤类型及土地利用／土地覆被类型等因素的综合影响，其中环境因子是影响土壤有机碳空间分布的主导因子、土壤类型和土地利用／土地覆被类型的影响在空间上表现不明显。

The research on spatial distribution of soil organic carbon contents in the Sanjiang Source Regions has great significant on regional carbon cycle under the global climate change. In this study, Kriging interpolation method was used for predicting the spatial distribution of soil organic carbon in Yushu County, Qinghai Province based on soil organic carbon contents of soil sample with the support of GIS and analyzed its main influence factors as well. Theresults indicate the level of soil organic carbon contents is highest in Longbaotan Natural Reserve located in Northwestern, which has been above 90 g/kg. It is relatively low in eastern of Batang, and Xialaxiu southwest, which is about 50-75 g/kg. The lowest is about 26.5-45 g/kg in Jiegu, Zhongda and Tongtian River. The spatial distribution of soil organic carbon contents of Yushu County is mainly influenced by environmental factors, soil type and land use/land cover type and other factors. The environmental factors are the dominant factors that affect the spatial distribution of soil organic carbon as soil type and land use/land cover type are not obvious.