| 沙漠与沙漠化 |
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| A Probe into Grassland Wind Erosion based on the Analysis of Soil Particle Size |
| YAN Yu-chun1, TANG Hai-ping2, ZHANG Xin-shi2, WANG Xu1, WANG Hai-xiang3 |
| 1.Key Lab of Resources Remote Sensing and Digital Agriculture, Ministry of Agriculture; Hulunbeier State Station of Grassland Ecosystem Field Observation and Scientific Research, Institute of Agricultural Resources and Regional Planning of Chinese Academy of Agricultural Sciences, Beijing 100081, China; 2.State Key Laboratory of Earth Surface Processes and Resource Ecology; Institute of Resources Science, College of Resources Science & Technology, Beijing Normal University, Beijing 100875, China; 3.Inner Mongolia Autonomous Region Academy of Surveying and Mapping, Hohhot 010051, China |
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Abstract The land surface vegetation coverage, soil particle size and organic carbon content in the typical steppe under overgrazing, cultivation and exclosure were investigated in Inner Mongolia and the influences of human activity on grassland soil erosion was analyzed. The results were as follows. Compared to enclosed grassland, the vegetation coverage, height and root biomass of overgrazing grassland decreased by 44.23%, 80.71% and 37.83% respectively. Due to the decline of vegetation coverage and root density, the soil of overgrazing grassland demonstrated a significant wind erosion. Overgrazing resulted in the increase of sand content in the surface soil and about 100% increase of the mean soil particle size. Furthermore, cultivation had led to serious soil wind erosion and 2.5 times increase in mean particle size. The overgrazed and cultivated grassland had become an important source of sand dust. The coarsening of soil particle directly aroused the decline of soil organic carbon content, and when 1 percent of soil particle content below 0.1 mm was blown away by wind, organic carbon content in soil reduced 0.2546 g·kg-1.
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Received: 23 November 2009
Published: 20 November 2010
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2010, Vol. 30 
