| 沙漠与沙漠化 |
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| Field Observation of Farmland Wind-erosion around Beijing |
| WANG Ren-de1,2,3, ZOU Xue-yong2,3, ZHAO Jing-yan2,3 |
| 1.Institute of Geographical Sciences, Hebei Academy of Sciences, Shijiazhuang 050011, China; 2.State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875; 3.China Center of Desert Research, Beijing Normal University, Beijing 100875, China |
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Abstract In view of relatively weak wind-erosion in semi-humid region, a new-style sand sampler and sand trapping device were used in the field observation of farmland wind-erosion in Beijing. The results showed that among three kinds of farmlands, wind-erosion of ploughed and harrowed farmland was the most serious, that of ploughed and non-harrowed farmland is the weakest and that of stubble-keeping farmland lied between them. With the wind speed increasing, wind-erosion intensity of the three types of farmlands presented a increasing trend showing significantly exponential regularity. Vertical distribution of wind-erosion sediment followed the decreasing law of power function. Vertical distribution of the largest and average particle diameters also followed the decreasing law of power and index functions, respectively. The results also showed that diameters of most wind-erosion particles were smaller than 100 μm. Therefore it can be concluded that wind-blown sand structure in the study area was mainly characterized by suspension, which may be a normal state of farmland wind-erosion in semi-humid region.
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Received: 12 July 2010
Published: 20 March 2011
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2011, Vol. 31 
