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| Impact of conservation tillage on soil wind erosion |
| Fan Qingcheng1,2,Wang Fei1,3,Mu Xingmin,Liu Zhendong3 ,Li Rui1,3 |
| Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, 712100, Yangling , Shaanxi; 2.Graduate School of the Chinese Academy of Sciences, 100049, Beijing; 3.Institute of Soil and Water Conservation, Northwest A&F University, 712100, Yangling , Shaanxi: China |
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Abstract Conservation tillage could reduce soil wind erosion effectively on farmland. An experiment of soil wind erosion on farmland in northern Loess Plateau was designed with wind tunnel tests under different conservation treatments including straw mulch, stubble and ridge tillage. The results indicated that straw mulch and stubble could reduce the soil wind erosion rate, and the soil wind erosion rate under straw mulch with 4210kg/hm2 was decreased by 62.8% compared with CK(no conservation treatment), which was less than that under other conservation tillage. The ridge tillage which was perpendicular to the wind could reduce soil wind erosion rate in low wind velocity, the direction of ridge also affected soil wind erosion, and the soil wind erosion rate under ridge tillage with the same direction as the wind was more than others. With increasing straw mulch and height of stubble, the soil wind erosion rate decreased in the same velocity. The soil wind erosion rate had a significant power function to wind velocity under conservation tillage treatments. In the height of 0-60cm, the total volume of sediment discharge under straw mulch was the least, while the largest under ridge tillage. The most of sand concentrate in the height of 45-60cm under ridge tillage that direction was perpendicular to the wind, and concentrate in the height of 0-15cm under other treatments. The sediment discharge percent in the height of 0-15cm increased with increasing wind speed. The sediment discharge percent decreased with decreasing height of stubble and with the increasing amount of straw mulching. It is suggested that the straw mulching 20cm and both of them should be suitable for preventing soil wind erosion.
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Received: 29 December 2010
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