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

摘要：NO3-N在源流中的滞留：河岸植被、代谢和地下过程的影响人类活动向陆地和水生环境引入了大量的氮，对森林、河流和河口产生了不利影响。因此，了解自然过程如何以及在何处保留和转化氮是很重要的，因为它在景观中移动。我们的研究将集中在源头溪流如何作为氮的保留地点，重点是将氮返回大气的微生物过程。程序设计比较了在陆地环境中不同的水源溪流以及溪流与地下水相互作用的程度。将在新墨西哥州、田纳西州和北卡罗来纳州建立研究地点，以比较森林类型（开放或密集）和地下过程（基岩上的溪流与与地下沉积物交换水的溪流）的影响，以评估河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