中纬度地区气候环境变化对持久性有机污染物归趋行为的影响-以神农架大九湖为例

持久性有机污染（POPs）具有半挥发性、难以降解性、毒害性及生物积累性，土壤、沉积物和冰川往往是POPs在环境中的最终归宿。但是受气候变暖和人类活动影响，贮存在这些介质中的POPs会被二次释放重新回到环境中，成为“定时炸弹”。本项目拟开展中纬度地区——神农架大九湖为例，气候环境变化对OCPs和PAHs归趋行为影响的研究。对大九湖泥炭柱的形成年代、气候环境及POPs的沉积速率、迁移通量、主要来源及贡献量、源汇转换等进行探讨，通过野外监测与室内模拟相结合方法，建立气候环境变化与POPs环境行为的定量响应关系，进行气候环境变化对POPs归趋的预测和评价。通过对百年尺度内POPs源汇角色识别与转换过程追踪，全面把握中纬度亚高山POPs环境地球化学过程与规律。这一研究可以丰富POPs全球迁移理论，加深对POPs在特殊地貌单元归趋的理解，还具有保护生态环境和水源地水质安全的现实意义。

Persistent organic pollutants (POPs) are lipophilic, hydrophobic, and semi-volatile chemicals. They are degraded slowly in natural condition and can affect human health by bio-accumulation and toxicity. Soil, sediment and ice glaciers are generally sinks for POPs due to higher deposition than volatility in those media. However, those POPs maybe released from those media to environment as “time bomb” if the climate warm occurred or by human activity. This project aims to study the impact of climate and environment change on the transfer and fate behaviors of typical POPs (e.g. PAHs and OCPs) in the mid-latitude region. We will take Dajiuhu Peat Wetland in Shennongjia as the case study. The age of sediment core will be dated by isotope method. The climate and environment when sediment formed will be inferred. The sediment velocity, input fluxes and main sources and contribution to POPs will be investigated. The quantitative relation will be established after filed monitoring and laboratory modelling. Finally, the prediction and evaluation on impact of the transfer and fate of POPs on environment will be carried out according to climatic and environmental change in the future. The diagnosis of source and sink, transfer process traced for POPs in hundred-year time scale will help us to completely understand the environmental geochemistry behavior and pattern of POPs in subalpine in mid-latitude region. The research would be of important theoretical significance in POPs’ global immigration and transfer in special topographic region . It also has practical significance in ecological environment protection and to assure water safety in water source area.