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Zhao M.,Gansu Minqin National Station for Desert Steppe Ecosystem Studies | Zhao M.,Desert Research Institute | Zhan K.J.,Gansu Minqin National Station for Desert Steppe Ecosystem Studies | Zhan K.J.,Desert Research Institute | And 9 more authors.
Environmental Earth Sciences | Year: 2011

The height profile of sand-dust flux at 0-2.0-m has been well studied. However, there have been very few experimental studies in the 0-50-m layer. In this study, the height profile of sand-dust flux at 0-50-m was observed by using three sandstorm observation towers (50 m in height) in 2006. The towers were located at three sites with different vegetation conditions (desert, edge of an oasis, and oasis) in the Minqin region, a typical desert-oasis area in China. At the same time, the features of the underlying vegetation were investigated. Results indicated that in the 0-50-m layer, sand-dust flux decreased rapidly as height rose at the desert and the edge of oasis sites, whereas it increased slightly as height rose in the oasis site. At the three sites sand-dust fluxes at each height increased with wind velocity, and there was a fairly good exponential relationship among them. In 2006, a total of 19 sandstorms occurred. The annual sand-dust that passed through a 1-m-wide, 50-m-high section was 9,169 kg at the desert site, 5,318 kg at the edge of oasis site, and 2,345 kg at the oasis site. Compared with the desert site, the annual sand flux was lower by 42% at the edge of oasis site and 74% at the oasis site. Vegetation had a significant effect in reducing the sand-dust flux. © 2010 Springer-Verlag. Source


Zhao M.,Gansu Minqin National Station for Desert Steppe Ecosystem Studies | Zhao M.,Desert Research Institute | Zhan K.J.,Gansu Minqin National Station for Desert Steppe Ecosystem Studies | Zhan K.J.,Desert Research Institute | And 15 more authors.
Science China Earth Sciences | Year: 2011

By measuring the sand-dust flux, vertical deposition, and the wind velocity throughout 19 sandstorms in the Minqin region, we quantitatively analyzed the horizontal distribution and vertical variation in sandstorm characteristics under different land cover conditions. The effect of different land cover on mitigating sandstorms was also investigated. The results indicated that, in the surface layer ranging from 0-50 m, the intensity of sand-dust horizontal flux and concentration of sand-dust decreased with the increase of the height in the desert and the edge of oasis, whereas the two physical quantities increased slightly with the increase of the height in the oasis. The two physical quantities obey power function well under all three cover conditions. Moreover, in the desert and at the edge of oasis, the sand-dust vertical deposition decreased with the increase of the height. But a partial unimodal distribution at the oasis site and the maximum deposition occurred at the height of 9 m, which corresponds to the middle height of farmland protection forest. The annual flux that passed through a section of 1 m in width and 50 m in height was 9169 kg in the desert, 5318 kg at the edge of oasis, and 2345 kg in the oasis. And the annual fluxes at the edge of oasis and in the oasis are 42% and 74% less, respectively, than that in the desert. This implies that the wind break forest significantly reduced the intensity of sandstorms. © 2011 Science China Press and Springer-Verlag Berlin Heidelberg. Source

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