大型丝状藻类对城市淤泥质河流甲烷（CH4）排放的影响及其作用机制研究

项目名称： 大型丝状藻类对城市淤泥质河流甲烷（CH4）排放的影响及其作用机制研究

项目编号： No.41203051

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 地球化学

项目作者： 梁霞

作者单位： 上海大学

项目金额： 25万元

中文摘要： 研究城市河流碳素生物地球化学循环过程，将有助于我们全面理解人类活动干扰对于河流生态系统以及全球气候变化的影响。大型丝状藻类通过改变水-沉积物界面物理、化学以及生物学因子环境，深刻影响着河流生态系统的碳循环过程。本研究以上海市苏州河及其一级支流为例，根据城市化的不同影响程度，由"中心城区-近郊-远郊"递减顺序在苏州河及其一级支流设立研究断面，采用静态气箱-气相色谱法，探索城市淤泥质河流CH4排放的时空变化格局，弄清大型丝状藻类在城市淤泥质河流生态系统中的作用，明确其对城市河流初级产生力的贡献，揭示大型丝状藻类对城市淤泥质河流CH4排放的影响，从藻类生理生态学和微生物地球化学两个角度阐明这种影响的作用机制，研究结论将有助于从更深层次上认识城市河流生态系统中CH4的排放途径及其影响因素，为全面理解人类活动影响下的河流生物地球化学循环过程提供理论支持。

中文关键词： 大型丝状藻类；城市化；淤泥质河流；甲烷；机制研究

英文摘要： The study of the carbon biogeochemical cycling processese in urban fluvial system, allow us to fully understand the impact of anthropogenic disturbance on river ecosystems function as well as on global climate change. Filamentous algae play an important role in the carbon biogeochemical cycle at the water-sediment interface in fluvial system. In this project, a case study will be conducted in the Suzhou River and its major tributaries in Shanghai, China, to explore the spatial and temporal variations of methane emission from these urbanized muddy substrate rivers, to reveal the role of filamentous algae in primary production in the urban river ecosystem, and to demonstrate the effect and mechanism of filamentous algae on methane emission in this region. Study results will contribute to a deeper understanding of methane generation and emissions in the urban fluvial system, and will provide theoretical support for the understanding of anthropogenic disturbance on microbial geochemical cycling process in urban river ecosystem. Research methodology in this project involves collecting the methane from sampling sites in Suzhou River and its major tributaries, which are setup according to the change of land use types. Net CH4 fluxes will be determined by a static chamber technique.

英文关键词： filamentous algae；urbanization；muddy substrate rivers；methane；mechanism