长江中下游地区富营养浅水湖泊生态系统恢复机理研究

富营养浅水湖泊的生态系统恢复已成为践行“绿水青山”国家战略的主要内容，而依赖于温带湖泊研究发展起来的富营养浅水湖泊生态恢复理论与技术在热带/亚热带湖泊中的应用需要进一步完善。本项目拟以长江中下游地区浅水湖泊为研究对象，通过一系列室内模拟实验和原位围隔实验，结合湖泊生态系统调查，验证本项目提出的三个科学假设：热带/亚热带浅水湖泊生态恢复时，可利用鲢鳙与贝类联用控制藻类、改善水下光照条件，促进沉水植物恢复；沉水植物恢复时需要更高的植被覆盖度才能发挥清水效应；利用鱼食性鱼类控制底栖杂食性鱼类，稳定沉水植被与清水系统。研究结果不仅可丰富热带/亚热带湖泊生态学理论，而且对我国富营养化浅水湖泊的生态恢复具有直接指导意义。

Ecosystem restoration of eutrophicated shallow lakes is a national strategy of "green water and green mountains", and the application of eutrophicated lake restoration theory and technology developed based on temperate lake research for tropical/subtropical lakes needs to be further improved.This project implements the proposed research on subtropical shallow lakes in the middle and lower reaches of the Yangtze River area through a series of indoor simulation experiment and in-situ mesocosm experiment, to test three scientific hypothesis: silver carp-mussel combination for control of algae, the improvement of underwater light conditions, promotion of the submerged plant recovery will lead degreased system return to the clear water state. When submerged plants are recovering, higher plant coverage is needed to maintain the clearwater effect. Piscivorous fish will be used to control benthic omnivorous fish Carassius auratus, and stabilize submerged vegetation and clear water system.The results not only enrich the theory of tropical/subtropical lake ecology, but also have a direct guiding significance for ecological restoration of shallow eutrophicated tropical/subtropical lakes.