Research on distribution rule of wind-sand flow over farmland covered by crop residuals | 作物残茬覆盖农田地表风沙流分布规律
2013
Zhao Yonglai, Inner Mongolia Agricultural University, Baotou(China),College of Vocational and Technical | Chen Zhi, CAAS, Beijing(China),College of Mechanical and Electronic Engineering | Sun Yuechao, Inner Mongolia Agricultural University, Baotou(China),College of Vocational and Technical
chinois. 利用移动式风蚀风洞对秋翻地和作物残茬覆盖农田进行原位测试，探讨作物残茬覆盖农田地表风沙流的分布规律。结果表明：作物残萑覆盖农田地表的单位面积输沙量随风速与距地表高度的增加而明显增大，残萑盖度越大，输沙量越小；风沙流的活动主要集中在直立残茬高度范围内，在距地表300mm高度内的输沙量占输沙总量的86％以上；在高风速下65％以上盖度的残茬覆盖农田，具有更佳的风沙流截留效果。
Afficher plus [+] Moins [-]anglais. In order to investigate distribution rule of wind-sand flow over farmland covered by crop residuals, a moveable wind tunnel for aeolation was employed to carry out the field test both on autumn tillage field and crop residual stubble coverage fields. The results showed that field sediment transport amount on farmland covered by crop residuals increased with the increasing of wind speed and height from field surface,the more the stubble coverage, the less the sediment transport amount. The configuration of wind-sand flow was mainly occurred within the height of stubbles and the sediment discharge accounted for 86% of the total amount within the height of 300 mm from the earth＇s surface,The farmland covered by crop residuals has better interception effect if its cover degree exceeds 65% at high wind speed.
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