ISOTOPIC TRACER EXPERIMENT AT ECOSYSTEM SCALE

生态系统规模的同位素示踪剂实验

• 批准号: 6309045
• 负责人: ROBERT M HOLMES
• 金额: $ 2.74万
• 依托单位: UNIVERSITY OF CALIF-LOS ALAMOS NAT LAB
• 依托单位国家: 美国
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-02-01 至 2002-01-14
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6309045
• 关键词: biological products; biomedical resource; environmental health

The SIR provided 74% K 15 N03 containing 87.6g of isotope; 803.9g 17.5% K"N03 contining 131g of isotope; 4978.9 g 17.5% K 15 NO containing 10.4g of isotope; 4 lOg 21% of K 15 N63 continaing 186g of isotope; 2030. 1 g 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 Sound estuary, the site of an ongoing NSF-funded Land Margin Ecosystem Research (LMER) program. Previous whole-system labeling experiments in forested watersheds, lakes and rivers have demonstrated the 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 the water, food web components and sediments. The 15N addition experiment will provide information to test and refine complex models of 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.

SIR提供了74%的K15N03，含有87.6g；803.9g 17.5%K“N03，连续131g同位素；4978.9 g 含10.4g同位素的17.5%K15NO；4log 21%的K15N63继续摄入186g的同位素；2030年。改进了1克 了解河口的氮循环是有帮助的。 解释氮素输入的人为变化是如何影响的 沿海系统。我们建议通过实验测试概念性和 河口氮素动态的数值模型 富含15N的溶解无机氮进入长江上游 帕克河-梅子岛海湾入海口，正在进行的 NSF资助的土地边缘生态系统研究(LMER)计划。上一首 全系统标识试验在森林流域、湖泊和 里弗斯已经证明了其可行性、威力和成本效益。 示踪剂添加方法。在帕克河--普鲁姆岛 健全的河口，密集的测量添加的分布 氮示踪剂将产生对通量和停留时间的估计 水、食物网成分和沉积物中的氮。15N 附加实验将为测试和提炼提供信息 河口N流的复杂模型，否则很难 来验证。对该产品的了解将大大提高 氮素在河流中的迁移、转化和去向 盐沼河口。