Dissertation Research: Quantifying Nitrogen Spiraling in Anthropogenically Enriched Stream Ecosystems

论文研究：量化人为富集河流生态系统中的氮螺旋

• 批准号: 0206443
• 负责人: Herbert Valett
• 金额: $ 1万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-06-01 至 2004-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0206443&HistoricalAwards=false
• 关键词: Dissertation; Research; Quantifying; Nitrogen; Spiraling

Anthropogenic activities involving nitrogen (N) are contributing to eutrophication in marine and fresh waters. Because headwater streams are the primary interface between terrestrial and aquatic systems, they are an important link in the transport of N from enriched landscapes. However, N may be retained or removed through ecological processes occurring within streams. We will investigate the effects of enrichment on the ability of streams to retain N by comparing retention in study streams that span a gradient of N use and concentration. Retention will be measured by tracking the fate of N tracers experimentally released into study streams. We will quantify changes in ecosystem structure (biotic standing stocks) and function (metabolic activity) associated with enrichment and evaluate the influence of environmental factors (e.g., hydrology) on N retention. This approach to linking N enrichment and retentitive efficiency will increase understanding of theoretical and managerial aspects of N loading to lotic systems.

涉及氮（N）的人类活动正在促成海洋和淡水沃茨的富营养化。 由于源头流是陆地和水生系统之间的主要接口，它们是一个重要的环节，在运输的N丰富的景观。 然而，氮可以通过溪流中发生的生态过程被保留或去除。 我们将调查富集的能力流保留N的影响，通过比较保留在研究流，跨越梯度的N的使用和浓度。 将通过跟踪实验释放到研究流中的N示踪剂的命运来测量保留。 我们将量化与富集相关的生态系统结构（生物现存量）和功能（代谢活动）的变化，并评估环境因素（例如，水文学）对氮保持的影响。 这种将氮富集和保持效率联系起来的方法将增加对氮负载到Lotic系统的理论和管理方面的理解。