昼夜非对称性增温对大型浅水湖泊浮游植物及碳通量的影响

项目名称： 昼夜非对称性增温对大型浅水湖泊浮游植物及碳通量的影响

项目编号： No.41501215

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 地质学

项目作者： 邓建明

作者单位： 中国科学院南京地理与湖泊研究所

项目金额： 25万元

中文摘要： 近年来的研究报道表明全球大部分地区夜间增温幅度大于白天增温幅度，即增温存在昼夜非对称性（asymmetric trends）。随着全球范围内的富营养化，湖泊生态系统初级生产力显著提高；因此相比于海洋生态系统，虽然湖泊生态系统面积较小，但在地球化学循环中扮演越来越重要的角色。本项目拟以大型、浅水、富营养化湖泊——太湖为例，采用野外高频监测、太湖原位模拟实验以及室内纯培养实验等技术手段相结合，以浮游植物为主要研究对象，探讨昼夜非对称性增温对浅水湖泊生态系统的影响。项目预期阐明太湖昼夜水温的长期变化规律以及对浮游植物群落演替的影响；揭示浮游植物群落结构及其吸收与释放CO2总量对昼夜非对称性增温的响应，以及背后的机制。研究结果可以深化淡水生态系统对当前气候变化响应，以及气候变化对淡水生态系统碳平衡影响的认识。

中文关键词： 全球变化；碳循环；气候情景；浮游植物；非对称性变化

英文摘要： Diel asymmetric warming trends, which means nighttime temperature increased faster than daytime temperature, have been reported recently around the world. World-wide, eutrophication has significantly enhanced primary production, especially in shallow lakes. Even with smaller total area than marine ecosystem, shallow lakes play an increasing vital role in the geo-biological-chemical cycling. Our project aims to take Lake Taihu, a representative large shallow eutrophic lakes, as an example, using high frequency monitoring, bioassays and pure cultures. The project is expected to explore the effects of diel asymmetric warming trend on phytoplankton community composition, growth rates and lake ecosystems. The project is also expected to clarify the long-term changes of diel temperatures in Lake Taihu and their impact on phytoplankton community succession, as well as the uptake and release of CO2 by phytoplankton. The results will help clarify how phytoplankton community composition and lake carbon fluxes are altered in response to climatic changes (including asymmetric warming).

英文关键词： global change; Carbon cycle;climate scenarios;phytoplankton;asymmetric trends