水土保持学报2009，Vol.23Issue(5)：39-43,5.
半湿润区农田风蚀物垂直分布特征
The Vertical Distribution Characteristics of Farmland Wind-erosion Dust over Semi-humid Region
摘要
Abstract
Observation of the vertical distribution characteristics of farmland wind-erosion dust over semi-humid region using two methods showed that the wind-erosion in semi-humid region was weak and the wind-erosion dust which mainly composed of extremely fine sand and silt was thin. The power decreasing rule of wind-erosion dust changing in vertical direction had reflected the wind-sand flow feature of primarily comprising of Suspended sediment. The wind-sand flow structure was influenced remarkably by the farmland surface condition, wind speed and dust grade. The farmland wind-erosion intensity had an influence on the changing rule of wind-erosion dust near surface;The wind speed increasing had made an relatively arising of sand transporting percentage in near surface and a reducing upward; The decreasing scope of sand transporting in vertical direction was adding with the increasing of sand size. With increasing height, the percent of sand decreases, but the percent of silt and clay increases, the wind-erosion particle size became thin, and the particle size spectrum squeezed. The vertical distribution of maximum and average particle size followed the descending law of index function.关键词
风蚀物/垂直分布/半湿润区Key words
Wind-erosion dust/vertical distributions semi-humid region分类
农业科技引用本文复制引用
王仁德,邹学勇,吴晓旭,赵婧妍..半湿润区农田风蚀物垂直分布特征[J].水土保持学报,2009,23(5):39-43,5.基金项目
国家"十一五"科技支撑项目(2006BAD26B03) （2006BAD26B03）
