Wind erosion at the dry-up bottom of Aiby Lake——A case study on the source of air dust  

作　　者：穆桂金 闫顺 吉力力 何青 夏训诚 

机构地区：[1]Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China [2]Xinjiang Institute for Desert Meteorology, Xinjiang Bureau of Meteorology, Urumqi 830011, China

出　　处：《Science China Earth Sciences》2002年第z1期157-164,共8页中国科学（地球科学英文版）

基　　金：supported by the National Key Basic Research and Development Project(Grant No.G1999043502);the National Natural Science Foundation of China(Grant No.49772141).

摘　　要：Clay-rich deposits are usually considered as hard materials to be eroded by wind.Data from both surface monitoring and field survey at the dry-up bottom of Aiby Lake present thatclay-rich lacustrine deposits are easily broken down and eroded away by wind in the seasonalalternation process under the natural arid environment, and are the significant source of air dust.The surface of the clay-rich deposits is broken and softened by the freezing-and-thawing action inwinter season and/or by salt and alkali action with precipitation. Impact of wind-input particles andplow of plant branches with wind force drive the clay-rich sediments moving. Wind picks up theclay pebbles and repeats the impaction further-ward onto the dry-up surface. Tremendous finematerials, including soft salts, are contributed to air dust, and transported in long distance.Clay-rich deposits are usually considered as hard materials to be eroded by wind. Data from both surface monitoring and field survey at the dry-up bottom of Aiby Lake present that clay-rich lacustrine deposits are easily broken down and eroded away by wind in the seasonal alternation process under the natural arid environment, and are the significant source of air dust. The surface of the clay-rich deposits is broken and softened by the freezing-and-thawing action in winter season and/or by salt and alkali action with precipitation. Impact of wind-input particles and plow of plant branches with wind force drive the clay-rich sediments moving. Wind picks up the clay pebbles and repeats the impaction further-ward onto the dry-up surface. Tremendous fine materials, including soft salts, are contributed to air dust, and transported in long distance.

关 键 词：wind erosion  SOURCE of AIR dust  Aiby Lake. 

分 类 号：X14[环境科学与工程—环境科学]