Abstract: Aeolian sanddust transport is a serious problem in many arid regions in the world, and it is considered to be the significant part of global biogeochemical cycles. Deserts are the main sources of aeolian sanddust transport in the nearsurface air layer, and aeolian sanddust transport process is closely related to the variation of horizontal sanddust flux near ground surface with the height. In this study, the samples were collected with BSNE samplers, the data of horizontal sanddust flux over sand dune top and level sandland in hinterland of the Taklimakan Desert were analyzed, and the variation of horizontal sanddust flux within 200 cm above the ground surface with the height was researched. The results indicated that, in the nearsurface air layer in a range of 0-200 cm, the intensity of horizontal flux of aeolian sanddust decreased significantly with the increase of the height over sand dune top and level sandland. Over the two different underlying surfaces, the change of horizontal sanddust flux with the height obeyed the power function well. The total flux of aeolian sanddust passing through a section of 100 cm×200 cm was 3 721.0 kg over sand dune top, but 2 252.9 kg over level sandland and reduced by 39.5% compared with that over sand dune top. The horizontal fluxes of aeolian sanddust of PM80 over sand dune top and level sandland were 996.8 kg and 678.9 kg respectively.  

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