黄河源区高寒草地土壤有机碳储量及分布特征

选择位于黄河源区的青海省果洛藏族自治州为研究区，利用第二次全国土壤普查所得的土壤剖面数据以及55个典型土壤剖面的地理位置、土层深度、有机质含量、面积、理化分析数据和1:50万数字化土壤类型图，在GIS的支持下利用土壤类型法对黄河源区草地土壤碳库进行了估算。结果表明，黄河源区土壤碳密度较高，平均土壤有机碳密度为29.97 kg/m²，高寒草地土壤有机碳库主要由高山草甸土和高山草原土的有机碳库构成，研究区土壤有机碳总储量达15×10⁸tC。区域草地土壤有机碳密度及储量呈明显的水平和垂直分异规律。

The Soil Organic Carbon Storage and Its Spatial Distribution of Alpine Grassland in the Source Region of the Yellow River

The alpine grassland in the Tibetan Plateau plays an important role in global carbon cycle and carbon balance. However, regional carbon cycle in the alpine grassland ecosystem is still not clear. In this study we selected Golog prefecture in the headwater of the Yellow River valley as a study area, which is loCated on the southeast of the Tibetan Plateau. Using field-obtained physical and chemical data from more than 50 typical soil profiles, the organic soil carbon storage in the study area is estimated. The results show that soil organic carbon sinks primarily include alpine meadow and alpine steppe soils. The mean soil organic carbon per unit area is 29.97 kg/m². The total soil organic carbon storage is about 15×10⁸tC. The spatial distribution of soil organic carbon is characterized by its density and storage increase from northwestern to southeastern part of the study area. The very cold environment results in the higher value of soil organic carbon density in the study area.