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《Quaternary Sciences》 2008-01
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POLLEN RECORD REFLECTS CLIMATE CHANGES IN EASTERN QAIDAM BASIN DURING 36~18kaB.P.

Wan Hewen①③ Tang Lingyu② Zhang Hucai③ Li Chunhai③ Pang Youzhi③(①College of Life Sciences,Anhui University,Hefe 230039; ②Nanjing Institute of Geology and Paleontology,Chinese Academy of Sciences,Nanjing 210008;③State Key Laboratory of Lake Science and Environment,Institute of Geography and Limnology Sciences,Chinese Academy of Sciences,Nanjing 210008)  
A continuous pollen record from the Shell Bar at the Qarhan Lake in Qaidam Basin provides information on the vegetation and climate changes in the Late Pleistocene.According to pollen percentage and concentrations,four palynological zones were identified.From 36.2aB.P.to 31.2kaB.P.,Poaceae(Graminae),Chenopodiaceae,Artemisia,and Cyperaceae dominated the pollen assemblage and grassy steppe-meadow plant communalities developed,corresponding to a mild and humid climate.The lake was fresh watered and deep.From 31.2kaB.P.to 27.6kaB.P.,the percentages of Pinus,Picea,and Betula increased,indicating the expanding of forest to the area surrounding mountainous and the increasing of temperature and the annual precipitation.However,as the evaporation might also increased,effective humidity droped,desert vegetation types such as Tamarix increased,and lake water became salified which caused the disappearing of Pediastrum after 30kaB.P.From 27.6kaB.P.to 23.3kaB.P.,the surrounding forest shrank and desert vegetation components increased significantly which suggest a dry and cold climate condition.The lake area also shrank.From 23.3kaB.P.to 18.0kaB.P.,pollen concentrations were very low,and the percentage of Zygophyllaceae and Chenopodiaceae increased,indicating a sparse desert steppe vegetation and an even colder and drier climate.Through the entire profile,the terrestrial pollen types are mainly Tamarix,Zygophyllaceae,Ephedra,Picea,Pinus,Cupressaceae,Juglans,and Betule,Chenopodiaceae and Artemisia which dominate modern pollen spectra in steppe and desert area were rare.The results are different not only quite from surface pollen analysis in the eastern part of the Qaidam Basin,but also from modern pollen records from other steppe and desert vegetation zones in NW China.They show that pollen record from the Shell Bar at Qaidam Basin can not be linked to modern pollen assemblages and the climate reflected by pollen record was significantly different from that of the present in the eastern part of the Qaidam Basin during the Late Pleistocene.
【Fund】: 中国科学院“百人计划”项目;; 国家自然科学基金项目(批准号:40371117和40401002)资助
【CateGory Index】: Q914
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