在浅水湖泊生态系统中沉水植被在维持湖泊清水稳态等方面具有不可替代的重要作用，但重富营养化湖泊中水生植被往往出现大面积衰退，加速水生态系统的深度退化和功能失调。水体富营养化被认为是沉水植物衰退的主要原因，但沉水植物衰退驱动作用具有时空和交互的复杂性，目前对其衰退机制的认识仍不全面，这也制约着受损湖泊的生态修复成功推进。本研究针对富营养化水体主要胁迫因子（低光、高氨氮、低氧和硫化物），拟开展多胁迫因子驱动沉水植物衰退的室内模拟研究。首次探索这四个主要富营养化相关因子在高水位条件下对长江中下游优势沉水植物苦草（Vallisneria natans L.）的生长、分配、克隆繁殖、碳氮资源代谢和抗氧化生理等的综合胁迫效应和动态胁迫规律，以从生理生态学角度揭示在富营养化湖泊水体中重要沉水植物功能群衰退的驱动机制以及胁迫反馈机制，来为我国富营养化湖泊深度修复与治理提供科学基础和理论依据。

Submersed macrophytes play irreplaceable roles in e.g. maintaining a clear-water state of shallow lake ecosystems. However, aquatic plants always heavily decline in hypereutrophic lakes, further accelerating the deep degradation and dysfunction of aquatic ecosystem. Eutrophication is considered as the main responsible for the decline, but the driving processes and effects are of space-time complexity and coactions in eutrophic lakes. At present, its complex recession mechanism is still not truly revealed, which limits the success in ecological restoration of damaged lakes. In the present study, the main stressors e.g. low light, high ammonia, hypoxia and sulfide in the eutrophic waters, were all employed in laboratory as to explore the driving mechanism of decline in plant function groups. It will be the first time to study the combined effects of these four stressors on the growth, biomass allocation, clonal propagation, C-N metabolism and antioxidative action of Vallisneria natans L., a dominate submersed macrophyte along the middle and lower reaches of the Yangtze River, under the condition of high water level. It's in favor of uncovering the driving mechanism of the population decline and stress feedback of the important submersed plant in eutrophic lakes in physiological ecology. And it can be the scientific foundation and theoretical basis for deep restoration and treatment of the Chinese eutrophic lakes in the future.