免耕留茬控制风蚀机理  

Study on Mechanism of Controlling Wind Erosion by No Tillage

作　　者：于明涛[1] 尚润阳[2] 刘义忠 王翔宇[1] 杨学武 

机构地区：[1]北京林业大学水土保持学院教育部水土保持与荒漠化防治重点实验室,北京100083 [2]海河水利委员会,天津300170 [3]内蒙古大青山国家级自然保护区,呼和浩特010010 [4]宁夏盐池县环境保护与林业局,盐池751500

出　　处：《内蒙古林业调查设计》2008年第2期8-10,20,共4页Inner Mongolia Forestry Investigation and Design

摘　　要：通过对四种不同高度、不同密度的向日葵留茬地的观测,发现:留茬高度越大、密度越大,对地表风速的降低和粗糙度的增大作用越明显,反之则越弱;茬高、密度大的留茬,控制风蚀作用也十分显著,反之,其作用弱,而在没有留茬时,风蚀加重,地表收集到的风蚀物含量增加。By observing the farmland covered with sunflower stubble mulch of different heights or different densities, it was discovered that if the stubble mulch is more higher and the density is more bigger, the aggrandizement function that lowers the earth＇s surface wind velocity and increase the rough degree is more obvious, whereas more weaker the aggrandizement function; if the stubble mulch is more high, the density is more bigger, the function that control wind erosion is more obvious, whereas more weaker; while there is no stubble mulch, wind erosion is aggravated, the matter collected from the earth＇s surface is increased.

关 键 词：留茬 风蚀 粗糙度 

分 类 号：S342[农业科学—作物栽培与耕作技术]