赣北山地泥炭沼泽记录的小冰期高分辨率植被与气候变化

本项目拟以中亚热带湿润季风区的赣北西山泥炭沼泽沉积为主要研究材料，利用 AMS14C和 210Pb/137Cs测年方法建立高精度年代框架；在沉积学分析基础上，以孢粉记录为主、植硅体和正构烷烃记录为辅建立高分辨率植被和气候指标序列，利用表土分析结果，对比确立孢粉/植硅体/正构烷烃-植被-气候关系，研究小冰期及其前后时期低山和泥炭地植被演替和气候变化历史，建立孢粉/植硅体转换函数，定量重建年均温和年降水量；和其它高分辨率记录及气候模拟结果对比分析，探讨研究区域小冰期湿地生态系统对季风降水变化的响应机制。本项目将为我国东南部季风区全球变化区域响应研究、气候趋势预测和湿地生态环境保护方面提供新的科学依据。

To reestablish vegetation and climate changes during Little Ice Age in the low mountains and peatlands in the mid-semitropical humid area, peat deposits sampled from Xishan Mountains in Northern Jiangxi Province are chosen as study materials through high-resolution multi-proxy records in priority of palynology, phytolith and N-alkanes. AMS14C dating is used to establish exact age frame assisted of 210Pb/137Cs dating. Relationship of pollen-vegetation-climate and phytolith-vegetation-climate is studied contrastively according to modern samples and conversion function of pollen/ phytolith is contrastively given to reestablish climate changes quantificationally. Then, the above results are contrasted to the other high-resolution records and simulation sresults to probe into mechanism of swamp ecosystem's response to global changes and providing scientific evidence to environment protect.