浅水湖泊沉水植物、附着藻类和螺类之间的相互关系及其对热浪的响应

项目名称： 浅水湖泊沉水植物、附着藻类和螺类之间的相互关系及其对热浪的响应

项目编号： No.31500296

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 生物科学

项目作者： 操瑜

作者单位： 中国科学院武汉植物园

项目金额： 20万元

中文摘要： 水生植物是湖泊生态系统健康运转的关键生物类群，水生植物特别是沉水植物对维持湖泊清水稳态具有重要的作用。在水体富营养化的胁迫下，沉水植物衰退和消失的现象在世界范围内都普遍出现。沉水植物-附着藻类-螺类复合体作为沉水植物维持清水稳态重要的正反馈之一，它在不同气候区域和不同的沉水植物优势群落中所起的作用有所不同，而现有的研究结果之间还存在许多分歧。在全球变化的背景下，极端气候事件如热浪将越来越频繁地出现，而浅水湖泊中沉水植物、附着藻类和螺类之间相互关系对热浪的响应至今仍不明确。本项目以中国浅水湖泊中十几种常见沉水植物、附着藻类和螺类为对象，系统地研究沉水植物-附着藻类-螺类复合体与环境因子的关系，结合人工模拟系统中不同富营养化程度下该复合体对热浪事件的的响应特征，并利用模型评估热浪对草型湖泊清水稳态的影响，从而为在全球气候变化背景下的水体富营养化治理、水生植被恢复提供理论指导。

中文关键词： 沉水植物；生理响应；极端气候事件；热浪；沉水植物-附着藻类-螺类复合体

英文摘要： Aquatic plants are the key community for the health of the shallow lake ecosystem. With the stress of eutrophication, the decay or disappearance of aquatic plants, especially submerged macrophytes, happened in many shallow lakes in a global scale. Macrophyte-epiphyton-snail complexity is considered as one of the most important positive feedback that submerged macrophyte use to maintain the clear state in shallow lakes, but the role of the complexity described above in different climate regions or in different submerged macrophyte communities is still highly debated according to the recent studies. More frequent extreme events like heat wave were expected under the warmer future, but the responses of macrophyte-epiphyton-snail complexity to heat wave are still unknown. Here, we choose several common species of submerged macrophytes and their epiphytic algae and snails in shallow lakes in China, run a more systematic investigation on the relationship of macrophyte, epiphyton and snails in natural lakes, summarize the connection between macrophyte-epiphyton-snail complexity and environmental factors, verify the trend of the complexity structure changes under different water nutrient levels and its responses to the heat wave in the experimental lakes, evaluate the effects of climate change, especially heat wave, on macrophyte-dominated clear lake ecosystem by using a PCLake model, and therefore provide the theoretical guides for lake and macrophyte restoration in a future of global climate change.

英文关键词： submerged macrophyte;physiological response;extreme climate events;heat wave;submerged macrophyte-epiphyton- snail complexity