湿地植物根系分泌物对根际氮转化菌群特征空间演化调控机制研究

项目名称： 湿地植物根系分泌物对根际氮转化菌群特征空间演化调控机制研究

项目编号： No.41203060

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： 郑蕾

作者单位： 北京师范大学

项目金额： 25万元

中文摘要： 湿地系统中氮的循环过程显著影响自身生态结构、功能和生产力，其氮的转化主要由根际生物过程完成。氮转化菌在根区呈不均匀分布状态，根系分泌物作为根际各化学物质参与生化反应的关键介质，对这一现象有重要影响。明确根系分泌物对根际氮转化菌的空间演化调控机制可促进掌控根区、理解根际氮循环过程，但关于其作用规律和内在机理尚未明确。针对此问题，本课题拟选取典型湿地植物芦苇，通过研究其根系分泌物在根际的微域分布特点、根系分泌物对根际关键非生物生态因子影响规律、根际微环境中氮转化菌对根系分泌物的趋化性、氮转化菌对根系分泌物的代谢功能等4个基本问题，揭示根系分泌物对根际氮转化菌作用机制，可促进人们对湿地植物-微生物互作机制、根际氮转化菌空间演化规律和根际氮转化过程的理解，研究成果预期可为优化人工湿地污水处理系统根区设计、合理调控氮转化菌群、提高相关生态水处理技术除氮效能提供科学依据，具有积极学术价值。

中文关键词： 根际；湿地；分泌物；调控；氮转化菌

英文摘要： Nitrogen cycling in wetlands has significantly effects on ecological structure, function and production of the systems. Nitrogen transformation in wetlands is mainly conducted by bioprocesses in rhizoshpere.Distribution of nitrogen transforming bacteria in rhizosphere is heterogeneous. Root exudate plays primary role in causing this feature as key transmitter for chemicals involved in rhizoshpere bioprocess. Elucidating the mechanisms of root exudates in shaping nitrogen transforming bacterial structures in rhizosphere will help to control rhizoshpere and give further insight into nitrogen cycling process in the underground environment. While the role and inside mechanisms of exudate in structuring nitrogen transfroming bacteria in rhizosphere remain unclear. Based on this situation, this project will choose typical wetland plant, Phragmites australis, as model to elucidate the mechanisms of its root exudate in shaping rhizobacterial structures through researches on 4 fundamental issues, i.e. micro-scale distribution of exudates in rhizosphere, effects of exudates on key abiotic eco-factors of micro-rhizosphere, chemotaxy of nitrogen transforming bacteria to exudates in micro-environments in rhizosphere, and metabolic profiles of nitrogen transforming bacteria on exudates. This project is to make people get bett

英文关键词： Rhizosphere；Wetland；Exudates；Regulating；Nitrogen transforming bacteria