Loss and Retention of Nitrogen in an Artic Landscape: Key Pathways and Process Regulation

北极景观中氮的损失和保留：关键途径和过程调节

• 批准号: 0444592
• 负责人: Gaius Shaver
• 金额: --
• 依托单位: Marine Biological Laboratory
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-01-15 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0444592&HistoricalAwards=false
• 关键词: Loss; Retention; Nitrogen; Artic; Landscape

The broad aim of this research is to improve understanding of how nitrogen (N) loss and retention processes affect long-term N accumulation and "N limitation" in terrestrial ecosystems. The specific aim is to determine the major pathways of N loss from Alaskan tundra ecosystems, the controls over those losses, and the importance of the losses for N accumulation and for interactions with the carbon (C) cycle. The field research will be based at Toolik Field Station, Alaska, and the research design is built around three core questions: What are the major forms and rates of N loss from different tundra ecosystem types? What are the major environmental and biological controls over these N losses? What are the impacts of N loss on overall N and C budgets of tundra ecosystems? The research design includes both field and laboratory experiments, and also the monitoring of N movement through soils and surface waters of a small watershed, Imnavait Creek. Simulation models will be used to construct N budgets at various timescales and to predict changes in N and C cycling in response to climate change and other disturbances.

本研究的主要目的是提高对陆地生态系统中氮素损失和保留过程如何影响氮素长期积累和“氮限制”的认识。 具体的目标是确定阿拉斯加冻原生态系统的氮损失的主要途径，这些损失的控制，以及氮积累和碳（C）循环的相互作用的损失的重要性。 实地研究将设在阿拉斯加的图里克野外考察站，研究设计围绕三个核心问题： 不同冻原生态系统类型氮素流失的主要形式和速率是什么？ 这些氮素损失的主要环境和生物控制措施是什么？氮素损失对冻原生态系统氮碳收支的影响是什么？研究设计包括现场和实验室实验，也通过土壤和地表沃茨的小流域，Imnavait溪氮运动的监测。 模拟模型将用于构建不同时间尺度的氮收支，并预测响应气候变化和其他干扰的氮和碳循环的变化。