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| The Influence of Thermokarst Lake Formation on Soil Desertification Process in Permafrost Regions of the Source Region of the Yangtze River |
| Gao Zeyong1, Wang Yibo1,2, Wen Jing1, Sheng Zhaohai3 |
1. College of Earth and Environment Sciences, Lanzhou University, Lanzhou 730000,China;
2. State Key laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
3. Weather Station of Wudaoliang, Golmud Meteorological Bureau, Golmud 816000, Qinghai, China |
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Abstract We chose Wudaoliang in the source region of the Yangtze River as the study area and a typically developed thermokarst lake as the study object, using the laser diffraction method to measure the soil particle size distribution (PSD), and studied the PSD and hydrological process of alpine meadow soil combined with a fractal model. The results show that the formation of the thermokarst lake speeds up the desertification of alpine meadow soil in the source region of the Yangtze River. As the affect intensifies, the share of clay particle (0-2 μm) and silt particle (2-50 μm) gradually decreases, while the share of sand particle (50-2000 μm) increases. Meanwhile, the volume fractal dimension also reduces gradually, showing a significant positive linear correlation with the share of clay particle and silt particle and a significant negative linear correlation with the share of sand particle. Volume fractal dimension of soil can substitute for PSD to characterize the process of soil desertification. In addition, soil hydrological process changes under the influence of thermokarst lakes, which is one of the important factors speeding up soil desertification.
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Received: 08 May 2013
Published: 20 May 2014
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Corresponding Authors:
王一博（Email：yibo_wang@163.com）
E-mail: yibo_wang@163.com
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2014, Vol. 34 
