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

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. The results 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.