Collaborative Research: NO3-N Rentention in Headwater Streams: Influence of Riparian Vegetation, Metabolism and Subsurface Processes

合作研究：NO3-N在源头河流中的滞留：河岸植被、代谢和地下过程的影响人类活动已经将大量的氮引入陆地和水生环境，对森林、河流和河口产生有害影响。 因此，重要的是要了解自然过程如何以及在何处保留和转化氮，因为它在景观中移动。 我们的研究将集中在如何源头流作为保留氮的网站，重点是微生物过程，返回氮到大气中的功能。该计划的设计比较了不同的源头流在他们的陆地环境和程度与流与地下水相互作用。 将在新墨西哥州、田纳西州和北卡罗来纳州建立研究点，比较森林类型（开放或密集）和地下过程（基岩上的溪流与地下沉积物交换水的溪流）的影响，以评估溪流生态系统的生物群如何有效地保留氮，以及这些过程如何在景观中变化。摘要

Abstract98-15868ValettCollaborative Research: NO3-N Retention in Headwater Streams: Influences of Riparian Vegetation, Metabolism and Subsurface ProcessHuman activities have introduced massive quantities of nitrogen to both terrestrial and aquatic environments with detrimental effects on forests, rivers, and estuaries. Consequently, it is important to understand how and where natural processes retain and transform nitrogen as it moves across the landscape. Our research will focus on how headwater streams function as sites for retention of nitrogen with emphasis on microbial processes that return nitrogen to the atmosphere. The program design compares headwater streams that differ in their terrestrial settings and the degree with which streams interact with groundwater. Study sites in New Mexico, Tennessee, and North Carolina will be established to compare the influence of forest type (open or dense) and subsurface processes (streams on bedrock vs streams that exchange water with subsurface sediments) to assess how the biota of stream ecosystems effectively retain nitrogen and how these processes vary across the landscape. Abstract