镉污染是全球关注的重大环境和健康问题。湖泊中蓝藻和水生植物等优势生物的生长和死亡降解将造成沉积物微环境的变化，进而影响沉积物镉的迁移转化和释放风险。本项目以多生态类型湖泊太湖为研究对象，依托自主研发的薄膜扩散梯度（DGT）、孔隙水扩散平衡（HR-Peeper）等技术，获取沉积物微界面镉与环境指标在不同时间尺度上的精细分布信息，揭示镉迁移的时空变化规律。利用薄膜扩散梯度-平面光极（DGT-PO）等技术，研究优势生物对沉积物微界面镉迁移的影响，结合环境条件模拟实验，进一步阐明沉积物微界面镉迁移的主要受控机制。本项目的实施将为湖泊沉积物镉污染的评价和治理提供科学依据。

Cadmium pollution is a very serious environmental and health problem of worldwide concern. The sediment microenvironment is easily changed with the growth and degradation of algae and hydrophyte in the lake, resulting in the migration and release of cadmium in sediments. This project will select the multi-ecological Lake Taihu as the objective and obtain fine-scale distribution information of cadmium and environmental indicators in the sediments on different time scales using self-developed DGT and HR-Peeper techniques. The temporal and spatial changing trend of cadmium in sediments will be revealed. The effects of the dominant organism in the typical lake region on the migration of cadmium are also studied using the DGT-PO technique. With the combination of microcosm experiments, the mechanisms responsible for the migration of cadmium in sediments will be finally clarified. The results of this project will provide the scientific basis for the evaluation and treatment of cadmium pollution in lake sediments.