摘要
民勤沙区的沙丘包括新月型沙丘、新月型沙丘链、沙垄、沙堆和复合型沙丘及沙丘链5种类型;沙丘高度一般为4～10 m;沙丘走向有横向(NE-SW)和纵向(NW-SE)以及多风向形成的不规则形.沙丘移动的基本特征是:(1)风是沙丘移动的动力,风向单一时沙丘移动速度快.(2)沙丘越高移动速度越缓慢.(3)沙丘自西北向东南方向移动为主.(4)沙丘移动的方式有前进式、摆动式和摆动前进式3种.(5)植被盖度越大移动就越缓慢.(6)一年中5月份移动速度最快,9月份最为缓慢.
Dune of desert area of Minqin includes barchane and barchane chain and ridge and sand mound and dune chain.The height of dune was 4~10m.Shifting of dune had horizontal direction (NE SW) and longitudinal direction(NW SE) and irregular formation formed with varied wind direction.The basic moving characteristics of dune was that wind was the moving motive force of dune and moving speed was quick when the wind direction was single.The higher the dune was,the slower the moving speed was.Taking longitudinal direction as the key direction,there were 3 moving ways of dune included forward way and swing way and forward with swing way.The more the mulching of vegetation cover was,the slower the moving speed was.The moving speed in May was the quickest of all year and that in September was the slowest.
出处
《防护林科技》
2005年第3期4-6,共3页
Protection Forest Science and Technology
关键词
沙丘
移动规律
基本特征
民勤
dune
moving rules
basic characteristics
Minqin
