基于补偿性种群动态研究沉水植物群落对环境干扰的响应

The ecosystem stability of a shallow lake depends heavily on the population dynamics of aquatic macrophytes. Compensatory dynamics in different species response to environmental perturbation is beneficial to keep ecosystem stability; and the variation of environment influences the strength of the compensation. Therefore, study the synchronous vs. compensatory in species is great significance to reveal the variation mechanism of submerged macrophyte community diversity. In this project, Lake Taihu, a eutrophic shallow lake, is observed and sampled. The goals of this project are: (1) In order to determine the direct and indirect impacts on submerged macrophyts, the dynamics of light climate and sediment consistency were investigated and analyzed; and then, the correlations between aquatic plants and habitat factors were analyzed with SEM(Structural equation modeling). (2) According to the physiology and microstructure analysis, the survival limit of macrophytes and the critical characteristics of community succession in the process of environmental change were determined; moreover, adaptive strategies of species to accommodate themselves to environmental factors were discussed. (3) By comparing the response of different species to stress, we analyzed the synchronization differences of plant species to environmental variations, and tried to explore the compensatory dynamics in different populations. We wished the project could provide a theoretical basis for the restoration and sustainable development of the lake ecosystem.

浅水湖泊生态系统的稳定性很大程度依赖于组成系统的水生植物的种群动态，环境变化过程中不同种群之间的补偿功能利于系统的稳定，而环境变动影响着这种补偿程度。因此，研究环境变动中物种之间的替代补偿作用对于揭示湖泊水生植物群落稳定性具有重要意义。本项目以富营养化浅水湖泊太湖为研究对象，通过调查和分析沉水植物种群结构、分布特点及水下光环境和沉积物结构等生境因子动态，建立SEM模型，确定环境因子对植物的直接和间接影响及强度；并通过植物形态、生理和微观结构分析，确定环境变化过程中沉水植物不同物种的耐受差异，探讨植物不同种群对环境变化的功能补偿关系；分析植物群落结构及分布在不同环境下的差异，进一步探讨物种对环境变化的补偿机制是否利于保持群落稳定性，并科学地预测植物群落动态，为湖泊生态系统的恢复及可持续发展提供理论基础；同时为揭示富营养化湖泊水生植物消亡的原因提供证据。

浅水湖泊生态系统的稳定性很大程度依赖于组成系统的水生植物的种群动态，环境变化过程中不同种群之间的补偿功能利于系统的稳定，而环境变动影响着这种补偿程度。因此，研究环境变动中物种之间的替代补偿作用对于揭示湖泊水生植物群落稳定性具有重要意义。本项目以富营养化浅水湖泊太湖为研究对象，调查和分析了沉水植物种群结构、分布特点及水下光环境和沉积物结构等生境因子动态，确定环境因子对植物的直接和间接影响及强度；并通过植物形态、生理和微观结构分析，确定环境变化过程中沉水植物不同物种的耐受差异，探讨植物不同种群对环境变化的功能补偿关系；分析植物群落结构及分布在不同环境下的差异，进一步探讨物种对环境变化的补偿机制是否利于保持群落稳定性，并科学地预测植物群落动态，为湖泊生态系统的恢复及可持续发展提供理论基础；同时为揭示富营养化湖泊水生植物消亡的原因提供证据。