CAREER: Potential for the Recovery of Biogeochemical Function in Degraded Stream Ecosystems

职业：退化河流生态系统中生物地球化学功能恢复的潜力

• 批准号: 0546251
• 负责人: Emily Bernhardt
• 金额: --
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-06-01 至 2011-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0546251&HistoricalAwards=false
• 关键词: CAREER; Potential; Recovery; Biogeochemical; Function

A growing body of research demonstrates the important effect undisturbed stream ecosystems have in altering the form, timing and magnitude of watershed nitrogen (N) losses. It is less clear whether, and to what extent, this capacity is reduced during watershed degradation. Emily Bernhardt is examining whether and how critical biogeochemical functions (the removal of reactive nitrogen and community metabolism) are affected in urban streams, and whether these streams have the capacity to recover those functions through 1) longitudinal transport through unmodified landscapes (natural recovery) or 2) extensive channel reconfiguration restoration efforts (manmade solutions). Bernhardt will experimentally test whether removal rates of nitrogen are strongly carbon limited in urban streams. This is likely because the organic matter necessary to fuel microbial activity is lost in frequent stormflow events typical of urban watersheds.Ultimately this research will increase our mechanistic understanding of stream nitrogen cycling, and will provide much needed information for guiding water resources management. The field sites used and the data generated from them will be used for introducing state managers, regional restoration practitioners, and environmental professional school students to aquatic ecosystem research. Bernhardt will also use this research as a platform for classes in aquatic ecology at a NC science magnet highschool and for Duke undergraduate students.

越来越多的研究表明，不受干扰的流生态系统在改变流域氮（N）损失的形式，时机和幅度上具有重要的影响。 尚不清楚在流域退化期间是否以及在何种程度上降低了这种能力。 艾米丽·伯恩哈特（Emily Bernhardt）正在研究城市流中是否有关键的生物地球化学功能（去除反应性氮和社区代谢）是否受到影响，以及这些流是否具有通过未修饰的景观（自然恢复）或2次的通道恢复解决方案（Manmade Resementions（Manmade Resementions）的纵向运输的能力）。 伯恩哈特（Bernhardt）将通过实验测试城市流中的氮去除率是否受到碳的限制。 这可能是因为在典型的城市流域典型的暴风雨流中损失了微生物活动所必需的有机物。因此，这项研究将增加我们对氮循环的机械理解，并将为指导水资源管理提供急需的信息。 所使用的现场站点以及从它们产生的数据将用于介绍州经理，区域恢复从业人员和环保专业学校学生进行水生生态系统研究。 Bernhardt还将将这项研究用作NC Science Magnet Highschool和Duke本科生的水生生态课程的平台。