洞庭湖地区全新世气候特征、湖面波动与人类迁移的耦合研究

季风区的大江、大河流域是人类重要的栖息地。全新世气候、环境变化与人类活动适应性研究可以作为历史"相似型"，提高人们对未来气候变化规律及其驱动机制的认识。洞庭湖流域历史上是人类活动相对强烈的地区，古人类活动遗址众多，沉积记录丰富，可以成为理解全新世气候变化与人类活动耦合关系的理想窗口。.本申请拟利用洞庭湖地区的自然湖沼沉积、钻孔和钻孔资料以及代表性古遗址、文化层沉积，试图通过高精度的年代学测试和遗址高程测量等手段，建立自然湖沼沉积和代表性古遗址、文化层较为精确的年代学框架；结合沉积相以及沉积物气候、环境代用指标的分析，了解流域全新世气候、环境变化的过程以及气候事件的特征表现；进行不同期古遗址、文化层特征的对比和时间衔接分析，揭示遗址时空分布特征所反映的人类历史迁移过程与历史湖泊水位变化的关系。开展区域地质、历史记录的相互对比，探讨其与季风气候、全球温度、海平面变化等驱动因素的联系。

Big river cathchments in monsoonal regions are important inhabitations for human beings. Studies on relations of Holocene climate variations and human adapatations can provide the "historcial analogies" for the better understangding of the dynamics of climate-human drived future. As a intensively human-influenced area, plentiful sediments and numerous neolithic sites make Lake Dongting catchment an ideal "window" to explore the coupled relationships of holocene climate change and human adapatations .In present proposal, infromation of environment and human activities changes in the lake Dongting catchment were intergrated from natural lacustrine sediments, boleholes and typical neolithic sites. High-precision radiocarbon dating of sediements and altitudes measurement of neolithic sites of different phases help to establish the choronological frameworks of the sediments and the temporal and spatial distributions of neolithic sites which imply the range of historical lake level changes. Holocene climate variations and charcteristics of cliamte events in lake basin were obtained through the multi-proxy ananlysis of sediments. The coupled linkages between the holocene climate changes, lake level fluctuations and movement of human beings in the lake basin were revealed by comparison analysis of climate and environmental proxies and the temproal, spatial distiributions of neolithic sites of different phases. The pattern and dynamics of climate changes and human adapations through the Holocene in Lake Dongting catchment were finally discussed by correlating of regional climate, environment and history archeological records with forcings of global hydro-thermal ciroulation, sea level changes and the variability of monsoon climate etc.