Through
wind tunnel experiment, the
rate of wind erosion and blown sand structure under conditions of ridge tillage and flat
tillage were studied. The results indicated that: The mean rates of wind erosion under ridge tillage were 20 to 40 percent less than that under flat tillage. A power function was found between the rate of wind erosion and wind velocity in the seven simulated tillage conditions, but the rate of wind erosion increased faster with the increasing wind velocity under flat tillage. Wind velocity of 15 m/s was the significant point to aggravate wind erosion, while ridge tillage greatly decreased the rate of wind erosion when the wind velocity beyond 15 m/s. In the height of 0～20 cm, the sand transport rate under flat tillage decreased with increasing height by a negative exponential function, while negative line functions were founded under ridge tillage. Under ridge tillage, the total volume of sand transport in 0～4 cm and sand transport percent between 0～4 cm and 0～20 cm (Q_(0～4)/Q_(0～20)) were less than that under flat tillage. Comparison among different kinds of ridge tillage, under the same ridge height, the rate of wind erosion decreased and Q_(0～4)/Q_(0～20) increased with increasing ratio between the height of ridge and the width of furrow. Under the same ratio between the height of ridge and the width of furrow, the rate of wind erosion increased and Q_(0～4)/Q_(0～20) decreased with the increasing height of ridge.