Dissertation Research: Ecosystem Metabolism and Nitrate Retention in Headwater Streams: Influence of the Hyporheic Zone

论文研究：生态系统代谢和源头水流中的硝酸盐滞留：潜流带的影响

• 批准号: 9902324
• 负责人: Clifford Dahm
• 金额: $ 1.05万
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-08-01 至 2001-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9902324&HistoricalAwards=false
• 关键词: Dissertation; Research; Ecosystem; Metabolism; Nitrate

Abstract99-02324Dahm / FellowsDDIG: Ecosystem metabolism and nitrate retention in headwater streams: Influence of the hyporheic zoneHuman alteration of the global nitrogen cycle through inputs of nitrogen such as those in fertilizer, wastewater, and combustion engine emissions is a critical global environmental problem. A clear manifestation of these inputs is increased concentrations of nitrate, a potential pollutant, in surface and groundwater throughout the U.S. Understanding nutrient dynamics in headwater streams is an essential part of understanding how rivers will respond to increased anthropogenic inputs of nitrate. The hyporheic zone (the region of mixing between surface water and groundwater) has recently been recognized as an important component of stream ecosystems, especially in headwater streams. Through their metabolic activities, microorganisms which live in the hyporheic zone can temporarily or permanently retain nitrate and prevent it from traveling downstream. This research quantifies the contribution of the hyporheic zone to nitrate retention in 3 headwater streams and investigates the relationship between this retention and rates of ecosystem metabolism.

DDIG：生态系统的新陈代谢和源头河流中硝酸盐的保留：低流带的影响人类通过氮的输入，如化肥、废水和内燃机排放物，改变全球氮循环是一个严重的全球环境问题。 这些投入的一个明显表现是硝酸盐，一种潜在的污染物，在整个美国的地表水和地下水中的浓度增加。了解源头河流中的营养动态是了解河流如何应对硝酸盐人为投入增加的重要组成部分。潜流带（地表水和地下水混合的区域）最近被认为是河流生态系统的重要组成部分，特别是在源头河流中。 通过它们的代谢活动，生活在潜流区的微生物可以暂时或永久地保留硝酸盐，并防止其向下游移动。 本研究量化了3个源头流的潜流区对硝酸盐截留的贡献，并探讨了这种截留与生态系统代谢率之间的关系。