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| Responses of Nebkhas Morphology to the Mode and Richness of Sand Supply |
| Zhang Ping1, Hasi Eerdun2, Yang Yi3, Wu Xia4 |
1. School of Agriculture, Ningxia University, Yinchuan 750021, China;
2. College of Resource Science and Technology, Beijing Normal University, Beijing 100875, China;
3. Shanghai Branch of National Computer Network Emergency Response Technical Team/Coordination Center of China, Shanghai 201315, China;
4. Tsinghua Tongfang Knowledge Network Technology Company Limited, Beijing 100192, China |
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Abstract The sand supply and its richness have long been considered the direct factors in influencing dune morphology. The targeted Caragana microphylla nebkhas are located at three different sites(downwind of alluvial fans, downwind of cultivated land and residual-depositional land) in northern foot of Yinshan Mountain of Inner Mongolian Plateau of China, and its distribution pattern and morphology were systematically measured with a typical quadrat sampling method. The results show that compared with those nebkhas locating at exogenous alluvial fans and cultivated land, the dunes at endogenous residual-depositional land are less in unit area, but the average size is larger. In downwind direction, the morphological parameters in horizontal direction of nebkhas at residual-depositional land are increased slowly and both the height(at vertical direction) of the vegetation and nebkhas has little change, while the parameters are decreased sharply at alluvial fan site. It is believed that the phenomenon is response to the difference of sand movement and quantity caused by relative location between the nabkhas and sand resource. There is an extremely significant linear relationship between the length and width of nebkhas at both endogenous and exogenous area(p<0.01), and the fitting lines' slope is increased in the downwind direction. A good correlation also exists between nebkhas height and vegetation height in the two supplying form(p<0.05). An extremely significant power function relationship was found between the horizontal parameters and height of the nebkhas on downwind of alluvial fan and residual-depositional land(p<0.01), and the fitting curves of horizontal parameters and height of nebkhas change slightly in wind direction at residual-depositional land, while that shows a gradually large variation in wind direction at alluvial fans.
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Received: 16 June 2015
Published: 20 November 2015
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2015, Vol. 35 
