Full-Text Search:
Home|About CNKI|User Service|中文
Add to Favorite Get Latest Update

Evolution and Climate Changes of the Juyan Lake Revealed from Grain Size and Geochemistry Element Since 1 500 a BP

JIN He-ling~{1, 2}, XIAO Hong-lang~1, ZHANG Hong~1, SUN Zhong~1 (1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou Gansu 730000, China; 2. School of Resources and Environment, Lanzhou University, Lanzhou Gansu 730000, China)  
The Juyan Lake, located in the north of Ejin Banner of Alxa League in Inner Mongolia, is a terminal lake of the Heihe River. The water area of the lake has gradually shrunk from 800 km~2 and even dried up in the past 3 000 years. The environment around the lake has also changed enormously. What is the reason bringing about such enormous changes? In this paper the lake evolution and climate changes are studied by analyzing the granularity and chemical elements of the lacustrine sediments in the Juyan Lake. The following conclusions are drawn: The lake evolution was controlled mainly by climate changes before Ming and Qing Dynasties, when the warm-humid climate resulted in an increase of inflow to the lake, which made the lake area expand and the chemical weathering strengthen; whereas the cold-arid climate resulted in a decrease of inflow to lake, which corresponded to lake water level drop, lake area shrank and chemical weathering weaken. After Ming and Qing Dynasties, especially in the recent 40 years, the anthropogenic factor predominated the lake evolution process. The Heihe River continuously decreases its inflow to the lake, because of large-scale land development, finally the Juyan Lake dried up due to zero inflow.
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©CNKI All Rights Reserved