潜流带是一个典型的动态生态交错带，也是一个复杂的混合氧化还原(Redox)系统。该系统中的氧化还原作用与物质循环是深刻解读地表水-地下水交互作用的关键所在。当潜流带中Redox变化时，相应水体和矿物表面的功能微生物群落结构、地下水化学中的氧化还原态物质活性、矿物表面氧化还原势等都将发生相应变化，最终影响污染物在潜流带中的迁移转化行为。本项目拟以江汉平原沙湖潜流带为研究区，通过精细表征潜流带结构、物质组成和水文地质、地球化学特征，从生物地球化学和地下水地球化学作用相互影响、相互制约的角度，深入研究有机磷农药(OPPs)污染在潜流带中的迁移转化机理，揭示天然或人为因素对该区域Redox系统的影响及其对典型污染物迁移转化的逆效应，为预防或消除污染物通过潜流带对水环境质量和人类健康的危害、促进社会经济可持续发展，提供科学依据。

Hyporheic zone is a typical dynamic ecotone, and also a complex reduction-oxidation (redox) system, in which redox and matter cycle play significant roles to understand the interactions between surface-water and groundwater well. When the redox conditions change in the hyporheic zone, the structure of function microbial community in water and mineral surface, the activities and pieces of minerals in groundwater, the redox potential in mineral surface, and so on, will also change and influence the migration and transformation of pollutants in it. Shahu hyporheic zone in Jianghan Plain was selected as the study area in this project. Based on the fine-scale delineation of the structure, compositions and the geochemistry characterizations in hyporheic zone, the mechanisms of migration and transformation of organophosphorus pesticides (OPPs) were studied deeply considering the interactions between biogeochemistry and hydrogeochemistry. The objectives are to reveal how the redox system including regional hydrologic, chemical, biological environment is influenced by natural or anthropogenic activities and to present the inverse effects on the migration and transformation of typical pollutants in hyporheic zone. The results will provide scientific basis to prevent or eliminate the harmfulness of pollutants in hyporheic zone from water quality and human health and to promote social economic sustainable development.