青藏高原不同类型草地土壤有机碳特征研究

Soil Organic Carbon Characteristics of Different Alpine Grasslands in Qinghai-Tibet Plateau

青藏高原草地土壤蕴含着巨大的有机碳库,在全球碳循环中起着重要的作用。该文对青藏高原3种不同类型草地(高寒草甸、高寒草甸草原和温性荒漠)土壤总有机碳、活性有机碳(水溶性有机碳、易氧化有机碳)、腐殖质组分碳(胡敏酸碳、富里酸碳和腐殖质碳)、团聚体碳及团聚体稳定性进行了研究。结果表明,土壤总有机碳、活性有机碳、腐殖质组分碳、团聚体碳及团聚体稳定性指标(包括平均重量直径、几何平均直径、>0.25mm的团聚体所占含量及水稳定团聚体比例)的顺序均为温性荒漠<高寒草甸草原<高寒草甸,高寒草甸土壤的团聚体稳定性最高。

Alpine grassland soils on Qinghai-Tibet Plateau store a large number of organic carbon and play an impor- tant role in the global carbon cycle.We investigated soil organic carbon, active organic carbon （easily oxidizable or- ganic carbon, water soluble organic carbon）, humic fraction carbon （humic acid, fulvic acid and humus carbon）, ag- gregate-associated carbon and aggregate stability on the Qinghai-Tibet Plateau in the three different levels grass （al- pine meadow, alpine steppe and alpine temperate desert ）, and explored their spatial patterns of SOC fraction, and aggregate stability. The results showed that soil organic carbon, active organic carbon, humic fraction carbon, aggre- gate-associated carbon and aggregate stability all increased in the order alpine temperate desert 〈 alpine steppe 〈 al- pine meadow, the soils aggregate stability were the highest on alpine meadow.