Research Initiation Grant: Bacterial Respiration of Terrestrial Carbon in Freshwater Systems: Implications for the Terrestrial C Budget

研究启动资助：淡水系统中陆地碳的细菌呼吸：对陆地碳预算的影响

• 批准号: 0820725
• 负责人: Shannon McCallister
• 金额: $ 17.5万
• 依托单位: Virginia Commonwealth University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-15 至 2011-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0820725&HistoricalAwards=false
• 关键词: Research; Initiation; Grant; Bacterial; Respiration

The exchange of carbon between terrestrial and aquatic ecosystems is a critical component of the global carbon cycle. Movement of terrestrial carbon from land to water represents a loss of carbon from the former and a gain for the latter, and these changes must be taken into account when determining the net carbon balance of either system. In most terrestrial carbon cycle studies, the magnitude of this loss has not been determined, possibly resulting in an over-estimation of carbon storage in the terrestrial system. If the carbon that enters the aquatic system is eventually respired, or lost to the atmosphere, then this is a potentially serious error in calculations of regional and global carbon cycling. The specific goal of this project is to determine the age of terrestrially-derived carbon from forests in Massachusetts and the subsequent metabolic fate of this carbon in adjacent aquatic systems over seasonal and annual cycles. A multi-disciplinary approach will employ a variety of biochemical and analytical techniques to determine the age and fate of soil carbon. The research will have important implications for decision makes and managers who are interested in maximizing net carbon storage within particular regions. Outreach efforts will focus on the concept of connectivity between inland ecosystems and downstream estuaries and the coastal zone. The focus will be on improving the coverage of concepts and topics in aquatic ecology in curricula for K-12 education. The principle investigator is partnered with the Math and Science Center of Virginia. Three teacher-student teams consisting of one high school biology or earth science teacher and four 10th grade students, with priority given to students from under-represented groups, will participate in a two-week, field-oriented institute to educate and provide research experiences.

陆地和水生生态系统之间的碳交换是全球碳循环的关键组成部分。陆地碳从陆地向水的移动意味着前者碳的损失和后者的收益，在确定这两个系统的净碳平衡时必须考虑到这些变化。在大多数陆地碳循环研究中，这种损失的大小尚未确定，这可能导致对陆地系统碳储量的高估。如果进入水生系统的碳最终被呼吸或流失到大气中，那么在计算区域和全球碳循环时，这可能是一个严重的错误。该项目的具体目标是确定马萨诸塞州森林中陆源碳的年龄，以及这些碳随后在季节和年度循环中在邻近水生系统中的代谢命运。一个多学科的方法将使用各种生化和分析技术来确定土壤碳的年龄和命运。这项研究将对有意在特定区域内实现净碳储量最大化的决策制定者和管理者产生重要影响。外联工作的重点是内陆生态系统与下游河口和沿海地带之间的连通概念。重点将是提高K-12教育课程中关于水生生态的概念和主题的覆盖面。首席调查员与弗吉尼亚州数学和科学中心合作。由一名高中生物或地球科学教师和四名10年级学生组成的三个师生小组将参加一个为期两周的实地教育和提供研究经验的研究所，优先考虑来自代表性不足群体的学生。