新疆艾比湖全新世以来的环境变迁与古气候

于1990，1991年夏对新疆艾比湖湖盆地区进行调查，运用孢粉、元素地球化学、碳酸盐含量以及测年分析，对其沉积物进行研究，重建了湖区全新世古气候的演化序列。结果表明，10．2－8．0kaB．P，气候温凉偏干；8．0－3．5kaB.P，气候以温湿为主，其中7．3－6．4kaB．P．为相对稳定暖湿期；3.5kaB．P.至今，以温干为主，气候与现代相似。随着湖面波动，艾比湖保存有全新世3个不同时期高潮面遗迹，并应用水热平衡模型，对各个高潮面期的古降水量进行计算，全新世暖湿期的降水量比现今高出1／4以上，超过300mm／a，这时期湖面扩大了近3倍。

CHARACTERS OF THE EVOLUTION OF CLHVIATE AND ENVIRONMENT OF HOLOCENE IN AIBI LAKE BASIN IN XINJIANG

on the basis of the basin geomorphology and lacustrine swhmenaryprofile of Aibi Inke investignted in sununers of 1990, 1991, the seqUenees of climaticevolution of Holocene in the Aibi tale basin were reconstructed by analysing thesedimentary stratigraphy, biostratigraphy and geochendstry, and the chronologicalreeords. The results show that, during Holocene, the general changr trends of thepaleoclimate in Aibi Lake area can be divided into three stages: (1) 10.2- 8.0kaB. P.,a temperate- cool and dry climate stage. (2) 8.0 - 3.5 kaB. P., a wannr mostclimat stage (especially 7.3 - 6.4kaB. P., a. relatively stabe htald temperate stage)(3) 3.5kaB. P.- present, a warm and dry stage, sindiar to the present dimate. Andlake water level fluctuaion left the trails of three high-lake-level stages preservedin the lacustrine deposits of Holocene. By applying a hydrologica andenergy-balanee model, the paleopredpitations of these three high-lake-level stageswere estimated. In the most moderate period of the climate of the Holocene in AibiLake region, the average predpitation was more than 300mm /a, an increase above1 /4 of the present. At this time, the lake area was three times that of the present.