Collaborative Research: No3-N Retention in Headwater Streams: Influences of Riparian Vegetation, Metabolism and Subsurface Process

合作研究：NO3-N在源头溪流中的保留：河岸植被、新陈代谢和地下过程的影响人类活动将大量氮引入陆地和水生环境，对森林、河流和河口造成不利影响。因此，重要的是要了解自然过程如何以及在哪里保留和转化氮素，因为它在整个景观中移动。我们的研究将集中在源头溪流如何作为氮的保留场所，重点是将氮返回大气的微生物过程。该程序设计比较了不同陆地环境的源头溪流，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(开阔或密集)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持氮，以及这些过程在整个景观中如何变化。

98-16087DahmCollaborative 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.