摘要
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:作物残茬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,残茬盖度越大,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。
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.
出处
《中国农业大学学报》
CAS
CSCD
北大核心
2013年第2期38-44,共7页
Journal of China Agricultural University
基金
国家自然科学基金项目(41161045)
内蒙古自治区自然科学基金项目(2010BS0607)
关键词
风沙流
作物残茬
移动式风洞
输沙量
相对截留率
wind-sand flow
crop residual stubble
moveable wind tunnel
sediment transport amount
relative interception rate
