【作者】 冯晓静； 高焕文； 毛宁； 王树东；

【Author】 Feng Xiaojing1,2 Gao Huanwen1 MaoNing1 Wang Shudong1 (1 College of Engineering, China Agriculture Univercity, Beijing 100080,China; 2 College of Mechanical and Electrical Engineering Agricultural University of Hebei, Baoding 071001,China)

【机构】 中国农业大学工学院；

【摘要】 永定河沙地是北京市五大风沙源之一,区域内分布着北京市面积最大的风蚀沙化土地,裸露的沙滩成为北京市治沙工程的重点区域。本实验利用野外移动风洞,对河滩绿化植被覆盖地的不同覆盖率在不同风速下的风蚀量进行测定。结果表明:播草盖沙可以提高起沙风速,有效减少河滩地的水土流失。覆盖率达到30%可比裸露地表减少风蚀量18.97%-54.55%;覆盖率60%比裸露地表减少70.69%-80%。覆盖率达到30%以上,即可将即可将风蚀控制在轻微侵蚀范围内。客土有利于植被的建植,相同覆盖率和风速下风蚀量小于河滩土。更多还原

【Abstract】 This wind tunnel experiment was conduced in Yongding dene for prevent wind erosion by grass. This paper analyzes the relationship between wind erosion and different cover rate. The main result was as following: (1) grass in dene can prevent wind erosion effectively; (2) when cover rate reaches 30%, wind erosion can reduce by 18.97%-54.55% than the barely field, and when cover rate reaches 60%, it can reduce by 70.69%-80%. (3) And if we can achieve the cover rate more than 30%, we can control the wind erosion under the slight degree of the PRC standard SL 190-96.更多还原