Distribution features of permafrost organic carbon density on different vegetation types in the upper reaches of Heihe River, Qilian Mountains
MA Suhui1,2, MU Cuicui1,3, GUO Hong1, ZHANG Xiankai1, LI Zeyuan1,4, ZHANG Tingjun1
1. Key Laboratory of Western China's Environmental Systems, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 73000, China; 2. College of Urban and Environmental Sciences, Peking University, Beijing 100781, China; 3. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China; 4. Environment Research Institute, Shandong University, Jinan 250100, China
Abstract：The heterogeneity of mountain permafrost affects the alpine vegetation type and have an effect on the distribution of soil organic carbon (SOC). In this study, the SOC densities and soil physical and chemical properties were measured on soil samples, which sampled from eight active layers within three types of vegetation cover (swamp meadow, alpine swamp meadow and alpine steppe). It was found that the average SOC density was highest in alpine swamp meadow (49.50 kg·m-2), following by alpine meadow (11.22 kg·m-2), and in alpine steppe it was the lowest (7.30 kg·m-2). In a vertical profile of SOC density, there was a slightly difference:no obvious variation in alpine swamp meadow, decreasing with depth in alpine meadow and alpine steppe, with a significant aggregation in surface. There were positive relationships between SOC density and soil moisture, silt and clay content, and a negative relationship between SOC density and pH value. General linear model result shows that the soil moisture content, pH value and soil particle composition are able to explain 96.39% of the organic carbon density variation, of which 81.53%, 9.33% and 4.75% are attributed to soil moisture, pH value and soil texture, respectively. It means that soil moisture plays a key role in distribution of SOC density in alpine permafrost regions.
马素辉, 牟翠翠, 郭红, 张现凯, 栗泽苑, 张廷军. 祁连山黑河上游多年冻土区不同植被类型土壤有机碳密度分布特征[J]. 冰川冻土, 2018, 40(3): 426-433.
MA Suhui, MU Cuicui, GUO Hong, ZHANG Xiankai, LI Zeyuan, ZHANG Tingjun. Distribution features of permafrost organic carbon density on different vegetation types in the upper reaches of Heihe River, Qilian Mountains. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2018, 40(3): 426-433.
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2018, Vol. 40 
