【摘要】 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 - 2 10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 145 0′s～ 15 10′s、1790′s～ 1890′s两次冷期极相吻合。指出了目前湖泊水面萎缩、环境恶化主要是人类活动的影响所致。更多还原

【Abstract】 Located in the marginal belt of the southeast monsoon and ecotone, Daihai Lake has always been one of the most significant areas in the studies of paleoclimate change. Environmental proxies, such as TOC,δ 13 C org , carbonate contents, frequency dependent susceptibility and ostracoda fossils of sediment from Daihai Lake, Inner Mongolia, had been employed to reconstructed the paleoclimate evolution during the past thousand years. The environmental multiproxies indicated the cold humid climate, rather than cold dry climate in the early stage of the Little Ice Age(LIA). The last two cold periods of the LIA, recorded by the sediment, were in good agreement with those deduced by tree rings, ice core and historical literature. Based on the climate features in the last hundred years, this paper also advanced that human activities had become the main reason of the lake environmental deterioration in recent years.更多还原