The Microobial Nitrogen Pump: Coupling 14C and Compound-specific Amino Acids to Understand the Role of Microbial Transformations in the Refractory Ocean DON Pool

微生物氮泵：耦合 14C 和化合物特异性氨基酸以了解难降解海洋 DON 池中微生物转化的作用

• 批准号: 1358041
• 负责人: Matthew McCarthy
• 金额: $ 60万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-04-01 至 2018-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1358041&HistoricalAwards=false
• 关键词: Microobial; Nitrogen; Pump; Coupling; 14C

Dissolved organic nitrogen is one of the most important - but perhaps least understood - components of the modern ocean nitrogen cycle. While dissolved organic nitrogen represents a main active reservoir of fixed and seemingly biologically-available nitrogen, at the same time most of ocean's dissolved organic nitrogen pool is also apparently unavailable for use by organisms. Recently, the idea of the "Microbial Carbon Pump" has emerged, providing a renewed focus on microbes as primary agents for the formation of biologically-available dissolved material. However, the role that microbes play in transformation of biologically-available dissolved organic nitrogen is still lacking. In order to fill gaps in this knowledge, researchers from the University of California Santa Cruz will apply a series of new analytical approaches to test the role of microbial source and transformation in formation of the ocean's biologically-available dissolved organic nitrogen pool. Results from this study will address one of the major unknowns of both chemical oceanography and the ocean nitrogen cycle.Broader Impacts:This proposal will provide oceanographers new tools to test ideas of microbial organic matter sequestration in a world where the oceans are rapidly changing. High school, undergraduate, graduate and post-doctoral education will be furthered through active participation in lab, field, and data synthesis activities.

溶解的有机氮是现代海洋氮循环中最重要的成分之一，但可能是最不为人所知的成分。溶解有机氮是海洋中固定的、似乎具有生物可利用性的氮的主要活性储存库，与此同时，海洋中大部分溶解有机氮库显然也无法被生物利用。最近，“微生物碳泵”的想法出现了，提供了一个新的关注微生物作为生物可利用的溶解物质形成的主要媒介。然而，微生物在生物可利用的溶解有机氮转化中所起的作用仍然缺乏。为了填补这方面的空白，加州大学圣克鲁斯分校的研究人员将应用一系列新的分析方法来测试微生物来源和海洋生物可用的溶解有机氮池形成过程中的转化作用。这项研究的结果将解决化学海洋学和海洋氮循环的主要未知数之一。更广泛的影响：该提案将为海洋学家提供新的工具，以在海洋迅速变化的世界中测试微生物有机物质隔离的想法。高中、本科、研究生和博士后教育将通过积极参与实验室、实地和数据综合活动来进一步推进。