摘要
利用敦煌地区戈壁和绿洲的观测资料,分析了两种地表下春季的风蚀起沙(尘)情况.研究表明,在自然状态下,由于地表土壤的粒子尺度分布特征、植被覆盖度及地表土壤水分含量等下垫面特征不同,绿洲地表风蚀起沙的临界摩擦速度要大于戈壁地表,其垂直尘粒通量(风蚀起沙率)比戈壁地表小将近一个数量级;但考虑人为的翻耕作用时,绿洲地表风蚀起沙的临界摩擦速度可能会减小一半以上,其垂直尘粒通量也将增加大约一个数量级,甚至比戈壁地表还要大.
Utilizing the observational data of Gobi and oasis in Dunhuang areas, the dust emission state of these two surfaces in spring are analyzed. The threshold friction velocity of oasis surface is greater than that of Gobi surface at natural condition, and the vertical dust flux of oasis surface is nearly 10 times smaller than that of Gobi surface because of the difference of the land-surface characteristics such as particle size distribution, plant vegetation and surface soil moisture content and so on, but when the man-made cultivation factor is considered, the threshold friction velocity of oasis surface will be decreased by more than one half and the vertical dust flux will be increased by nearly 10 times, even larger than that of Gobi.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2004年第4期390-394,共5页
China Environmental Science
基金
国家重点基础研究发展规划项目(G2000048703)
关键词
戈壁和绿洲
下垫面特征
摩擦速度
临界摩擦速度
垂直尘粒通量
Gobi and oasis
land-surface characteristics
friction velocity
threshold friction velocity
vertical dust flux
