摘要
土壤风蚀是干旱、半干旱地区灾害性地貌过程之一。通过对内蒙古与陕西接壤地区的主要土壤母质进行调查研究,选择沙黄土、河湖相堆积物和黑沙土,在沙风洞里模拟风蚀过程。结果表明:不同的粒度组成、沉积构造、土层湿度、扰动状况等都影响风蚀模量。原始沉积结构破坏之后,在同一风速下,风蚀模数提高数倍到数十倍。土层湿度提高1倍,风蚀模数降低380%。风速按算术级数律增大时,风蚀模量也大致以相同的规律增加。因此,在干旱多风季节,增加地面覆盖、减少地表扰动,有可能的地方进行灌溉都可以削弱风速,增强土壤抗风蚀能力。
Wind erosion is one of the most serious disaster-ridden geo- morphological processes in arid and semi-arid zone.Three types of soil parent material,which are sandy loess,black sandy soil and lacustrine deposits,in southeast Ordos and in the vicinity of the Great wall,were collected in three boxes(100×30×25cm).Erosion experiments were simu- lated in wind tunnel.The results show that the wind erosion rate is different for different parent materials due to the different structure, grain-size composition and soil moisture and so on.Mechanical distur- bance inforces erosion rate.Erosion modulus of disturbed material is more serious from several times to tenfold than that the undisturbed one.If soil moisture rose for one time,the erosion modulus would decrease for 3.8 times.As the wind velocity changes on the up grade of arithmetic series,the erosion modulus changes by the same way.It is clear from mentioned above that to bring the wind erosion under controll,the best and basic way is to decrease mechanical disturbance and to increase cover of surface soil during the windy and dry season.
出处
《水土保持学报》
CSCD
北大核心
1991年第1期33-40,共8页
Journal of Soil and Water Conservation
关键词
土壤
母质
风洞实验
风蚀模数
southeast ordos
soil parent material
wind tunnel simulation
wind erosion modulus
