Abstract: Drifting sand accumulation belts are formed after 60 years of desert control along the edge of the upwind direction of the oasis in Hexi Corridor, Gansu Province. Among them, the sand accumulation belts on the edge of the upwind direction of Minqin oasis are the largest and most continuous. To reveal the stability dynamics of sand accumulation belts, 11 sampling lines were set on the upwind edge of Minqin oasis, with which we observed wind erosion/sand accumulation and characteristic points of sand surface displacement for seven times from early November 2016 to early April 2019. The sand accumulation belts on the edge of upwind direction of Minqin oasis could be divided into three types based on their formations: Sand accumulation belt of artificial sand-fixing forest, of natural shrub, and of tree-shrub mixed single-row forest. Wind erosion is the most serious and the forward moving speed is the fastest in the sand accumulation belt of artificial sand-fixing forest, followed by that of natural shrubbery. The lighter the degree of wind-erosion on the sand surface, the slower the sand accumulation belt moves forward. The higher the coverage of herbaceous plants, the lighter the degree of wind erosion on the sand surface, and the more slowly the sand accumulation belt moves forward. The coverage of herbaceous plants and the stability of sand surface complement each other. The windward slope of sand accumulation belt is wind erosion surface, while leeward slope is sand accumulation surface. One side of wind erosion and the other side of accumulation maintain the forward movement and dynamic stability of sand accumulation belt.

Key words: electrokinetic, spatial distribution model, microbial migration