An Isotopic Tracer Experiment at the Ecosystem Scale

生态系统规模的同位素示踪实验

• 批准号: 9407829
• 负责人: Bruce Peterson
• 金额: $ 61.5万
• 依托单位: Marine Biological Laboratory
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-10-01 至 1998-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9407829&HistoricalAwards=false
• 关键词: Isotopic; Tracer; Experiment; Ecosystem; Scale

Peterson Improved understanding of the nitrogen cycle in estuaries is needed to help explain how anthropogenic changes in nitrogen inputs are affecting coastal systems. We propose to experimentally test conceptual and numerical models of nitrogen dynamics in an estuary by adding 15N-enriched dissolved inorganic nitrogen to the upper reaches of the Parker River-Plum Island Estuary, the site of and ongoing NSF-funded Land Margin Ecosystem Research (LMER) program. Previous whole system labeling experiments in forested watersheds, lakes and rivers have demonstrated there feasibility, power and cost effectiveness of the tracer addition approach. In the Parker River-Plum Island Sound estuary, intensive measurements of the distribution of the added nitrogen tracer will yield estimates of fluxes and residence times of nitrogen in water, food web components and sediments. The 15N addition experiment will provide information to test and refine complex models estuarine N flow that are otherwise very difficult to validate. The product will be greatly improved understanding of the transport, transformation, and fate of nitrogen in riverine saltmarsh estuaries.

彼得森需要更好地了解河口的氮循环，以帮助解释氮输入的人为变化如何影响沿海系统。 我们建议实验测试的概念和数值模型的氮动力学在河口的帕克河梅岛河口，网站和正在进行的NSF资助的陆地边缘生态系统研究（LMER）计划的上游添加15 N-富集溶解无机氮。 以前在森林流域，湖泊和河流中的整个系统标记实验已经证明了示踪剂添加方法的可行性，功率和成本效益。 在帕克河-梅岛湾河口，密集测量的分布所添加的氮示踪剂将产生的水，食物网成分和沉积物中的氮的通量和停留时间的估计。 15 N添加实验将提供信息，以测试和完善复杂的模型河口N流，否则很难验证。 该产品将大大提高对河流盐沼河口中氮的运输、转化和归宿的理解。