北疆地区早全新世环境演化的湖泊沉积记录

通过对北疆地区艾比湖沉积物的孢粉组合及其碳酸盐δ^18O,δ^13C,δ^13Corg，TOC，TON和Rb/Sr比等地球化学指标分析，重点对全新世早期气候环境演化特征进行了研究。结果表明，研究时段（8.0-11.cal ka B.P.)温度总体偏低，初期（11.5-10.6cal ka B.P.)较为温湿；早全新世向中全新世转换时期（8.9-8.0cal ka B.P.)气候波动显著。特别是3层泥炭沉积显示了艾比湖地区早全新世气候的强烈不稳定性。泥炭的发育程度及其同位素、孢粉分析数据等都显示，8.2cal ka B.P.,8.6cal ka B.P.,10.5cal ka B.P.的气候状况具有显著的冷湿特征，反映了早全新世的3次冷湿事件。

Lake Sediment Records of the Holocene Environmental Evolution in North Xinjiang

Closed lake in arid region is sensitive to the climatic change. Through the analyses of environmental proxies from the sediments in Aibi Lake-a closed one in the arid region, the characteristics of climatic environment in early Holocene epoch were studied. The pollen assemblage and other geochemical indices show that, the temperature was somewhat low in the period of 8.0 to 11.5 cal ka BP as a whole, but in its earlier stage (11.5 to 10.6 cal ka BP) the temperature was higher, acompanied by more precipitation. In the transitional stage from early Holocene epoch to middle Holocene epoch (8.9 to 8.0 cal ka BP) the climate fluctuated remarkably. Especially, the three layers of peat sediments revealed a strong instability of climate in early Holocene epoch in Aibi region. All informations on the development of peat and the experimental data of pollen and stable isotopes imply that the climatic condition at 8.2 cal ka BP, 8.6 cal ka BP and 10.5 cal ka BP was noticeably cold and humid, and could be regarded as three cold and humid events in early Holocene epoch.