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Palynological Evidence of Ecological Environment Change Since 240 ka BP for the Tianshuihai Lake, West Kunlun Mountains

LIU Guang-Xiu1 WANG Rui1 LI Shi-Jie1LI Bing-Yuan2 ZHU Zhao-Yu3(1Lanzhou Institute of Glaciology and Geocryology, CAS, Lanzhou 730000;2Institute of Geography,CSA, Beijing 100101;3Guangzhou Institute of Geochemistry,  
Pollen record from a drilling core 56.32 m in depth in the Tianshuihai Lake, West Kunlun Mountains, indicates that alpine desert vegetation is dominant since 240 ka BP in this region, but there are several fluctuations of Artemisia which is main component of steppe, reflecting that there exist several warmer and weter intervals under the cold and dry climate background. According to the changes of pollen kinds and the ratio of Artemisia and Chenopodiaceae (A/C), the pollen record can be divided into 10 zones, showing 10 climatic fluctuations and an ecological environment fragitity in this area.
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