流域内不同级别河流的空间位置、水文特征以及土壤环境特征不同，导致影响营养物质在相应河岸带土壤中迁移转化的主控因素不同。平原河网地区河岸带土壤非饱和带厚度较薄，潜水水位较高，降水、潜水、河水三者之间的相互作用对非饱和带土壤、土壤微生物、以及河岸带陆域与河水界面营养物质的动态交互过程影响显著。另外，人类通常对平原河网地区河岸带利用强度较大，河岸带生态系统破坏和退化现象十分严重。基于此，本项目以太湖地区典型入湖小流域内不同级别河流河岸带为研究对象，采用现场观测、室内实验相结合的研究方法，探讨河岸带土壤剖面水分运动规律，寻求"干湿交替"模式下河岸带土壤/微生物特性及其截污净污机制，剖析河岸带"陆域-河水"界面营养物质的动态交互过程，研发河岸带基质生态修复关键技术，从而揭示太湖地区入湖小流域河岸带土壤水文过程及其环境效应，构建该地区河岸带基质生态修复技术体系，为该地区非点源污染综合治理提供理论依据。

The spatial location, hydrological characteristics and soil environmental characteristics of the different level rivers in the basin are different, which leads to the difference of the master factors that affect the migration and transformation of the nutrients in the soil in the corresponding riparian zone. The thickness of unsaturated zone soil which is in the riparian zone of plain river network region is thinner, the level of phreatic water is higher. The interaction of the precipitation, phreatic water and river water has a significantly effect on the unsaturated zone soil, soil microorganism and the nutrients dynamic interaction in the interface of the riparian zone soil and river water. In addition, excessive use of the riparian zone in plain river network region caused that the destruction and degradation of the Riparian zone ecosystem were very serious. Based on these, the riparian zones of the different level rivers of the sub-basin of Tai Lake were chosen to as the research object and the research method that combines indoor experimental and field observation was used in the project. the rule of moisture movement which is in the riparian zone soil profile, the characteristics of the soil/microorganism in the riparian zone and its purification mechanism under the pattern of "dry-wet alternation", the nutrient dynamic interaction process in the interface of "soil - water" of the riparian zone, and the key technology of the riparian zone ecological restoration will be discussed. The project will reveal the riparian zone soil hydrological processes and its environmental effects of sub-basin of Tai Lake, and construct the ecological restoration technology system which is suitable for the region, and furthermore to provide the theoretical basis for the comprehensive prevention of the non-point source pollutants in the region.