Abstract: Wind erosion and deposition features on surfaces under different coverage of Alhagi sparsifolia community throughout its growing season were studied by field observation. The results indicated that during the period that Alhagi sparsifolia community grew from the primary stage to the stationary stage, the vegetation coverage whose planting density was 0.2 m^-2 increased from 3.09% to 34.42% and it varied from 3.18% to 22.66% when the density was 0.18 m^-2, and the sand control effect of the former was better than that of the latter; Both of the two showed severe wind erosion in the early days of the plant's growth, however, wind deposition was in charge of every observation stage after that, and net erosion and deposition amount per unit area increased first then tended to be steady with time; Bare sandy surface was mainly exposed to wind erosion; The vegetation coverage increased from 0.44% to 20.30% when the planting density was 0.1 m^-2, and the surface under which showed more serious wind erosion partially than the bare sandy surface did, and its erosion amount per unit area increased with time; Wind deposition obviously occurred in the internal of the community whose coverage was larger as well as leeward side of the plant, on the contrary, and the windward side on the periphery of the community and surface under a smaller vegetation coverage usually showed severe wind erosion; Sand control should be especially focused on the primary stage of the plant's growth after it is all cut and the area where the vegetation coverage is smaller.

Key words: Alhagi sparsifolia, vegetation coverage, wind erosion and deposition features, effect of sand control