近千年来内蒙古岱海气候环境演变的湖泊沉积记录

内陆封闭湖泊是气候环境变化的敏感指示计。通过对内蒙古岱海湖泊岩芯的有机碳同位素、总有机碳、碳酸盐含量和磁化率等多环境指标的综合分析，结合Ｐｂ－２１０测定的沉积速率，讨论了岱海地区近千年来的气候环境演化过程。揭示了本区现代小冰期的前期冷湿，后期冷干的气候特征。记录的最后两次冷期与根据冰芯、树轮、历史文献重建的１０年平均温度推得的１４５０’ｓ～１５１０’ｓ、１７９０’ｓ～１８９０’ｓ两次冷期极相吻合。

The Paleoclimate Changes during the Past MillenniumLnferred from the Lacustrine Core in Daihai Lake, Inner Mongolia

Located in the marginal belt of the southeast monsoon and ecotone, Daihai Lake has always been oneof the most significant areas in the studies of paleoclimate change. Environmental proxies, such as TOC, δ13Corg,carbonate contents, frequency dependent susceptibility and ostracoda fossils of sediment from Daihai Lake, InnerMongolia, had been employed to reconstructed the paleoclimate evolution during the past thousand years. Theenvironmental multiproxies indicated the cold humid climate, rather than cold dry climate in the early stage ofthe Little Ice Age(LIA). The last two cold periods of the LIA, recorded by the sediment, were in good agree-ment with those deduced by tree tings, ice core and historical literature. Based on the climate features in the lasthundred years, this paper also advanced that human activities had become the main reason of the lake environ-mental deterioration in recent years.