Collaborative Research: Mediation of Denitrification by Algal/bacterial Interactions in Stream Periphyton: Role of Successional Development and Species Identity.

合作研究：溪流附生生物中藻类/细菌相互作用介导的反硝化作用：演替发展和物种身份的作用。

• 批准号: 0640717
• 负责人: Christopher Peterson
• 金额: --
• 依托单位: Loyola University of Chicago
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-01 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0640717&HistoricalAwards=false
• 关键词: Collaborative; Research; Mediation; Denitrification; Algal

The main goals of this research involve removal of nitrate (NO3) from stream water in a bacterially mediated process called denitrification where NO3 is converted to biologically inactive nitrogen gas. Specifically, the work investigates this denitrification process in films of algae and bacteria referred to as biofilms. This research will investigate when biofilms in streams and rivers are of significance in removing nitrates, how the effectiveness varies with the algal and bacterial species composition and species diversity, and under what conditions the nitrate removal by biofilm is maximized. Input of dissolved nitrogen into aquatic systems, via agricultural runoff and atmospheric deposition of products of fossil-fuel combustion, has increased dramatically over the last century. High nitrate (NO3) content in groundwater poses significant health risks, and elevated NO3 loads discharged into the ocean from rivers are implicated in the formation of ''''dead zones'''' in coastal areas. Thus, understanding the process of this nitrate regulation and removal by bacteria is highly important.

本研究的主要目标是通过细菌介导的反硝化过程从溪流中去除硝酸盐（NO3），其中NO3转化为生物无活性的氮气。具体地说，这项工作研究了藻类和细菌薄膜中的这种反硝化过程，称为生物膜。本研究将探讨溪流和河流中生物膜在什么情况下对硝酸盐具有重要的去除作用，其效果如何随藻类和细菌的种类组成和物种多样性而变化，以及在什么条件下生物膜对硝酸盐的去除作用最大。在过去的一个世纪里，通过农业径流和化石燃料燃烧产物的大气沉积，溶解的氮进入水生系统的量急剧增加。地下水中硝酸盐（NO3）含量高构成重大健康风险，从河流排入海洋的NO3负荷升高与沿海地区‘’‘’死区‘’‘’的形成有关。因此，了解细菌调节和去除硝酸盐的过程是非常重要的。