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| Impact of protective measures on soil wind erosion on cropland: a indoor wind tunnel simulation |
| Liu Zhendong1, Wang Fei1,2, Zhao Yun1, Yan Li1 |
| 1.College of Resources and Environment, Northwest A&F University, 712100, Yangling, Shaanxi; 2.Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, 712100, Yangling, Shaanxi: China |
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Abstract In order to find a rational conservation tillage treatment, the experiment with different measures of gravel cover, straw cover, gravel cover combined with wheat stubble, straw cover combined with wheat stubble and 4 grades of wind velocity was designed. In this experiment, the relation between wind velocity, coverage, covering material and mass of wind erosion, wind erosion resistance efficiency, sandstorm flow structure was studied, and functions of wind erosion resistance of these treatments were compared. The results showed that under conditions of 4 grades of wind velocity and coverage ranging from 30% to 90%, the anti-erosion efficiency of straw cover was in the range of 54% to 92%, gravel cover ranging from 26% to 72%, combined with 30cm, 20cm, 10cm wheat stubble, the average anti-erosion efficiency of 30% gravel cover or straw cover changed from 70% to 78%. With the increase of coverage, the minimum inhibit effective wind speed of gravel cover gradually increased from 8.0m/s to 12.5m/s, while that of straw cover increased from 10.1m/s to 14.3m/s. Under the cover measures in the range of 0～62cm height sediment load was mostly concentrated in 0-26cm. For the measure of cover combined with wheat stubble the sediment load was mostly concentrated in the range of 0-60cm.
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Received: 26 August 2011
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