Dissertation Research: Denitrification in Subsurface Soils

论文研究：地下土壤反硝化

• 批准号: 1110683
• 负责人: G. Philip Robertson
• 金额: $ 0.98万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-06-01 至 2013-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1110683&HistoricalAwards=false
• 关键词: Dissertation; Research; Denitrification; Subsurface; Soils

This doctoral dissertation improvement project will study the loss of nitrogen from soils to the atmosphere, a process called denitrification. Traditionally, denitrification was thought to occur mostly in surface soils, but recent evidence suggests that deeper soils can also play an important role in the nitrogen cycle. This project will conduct a series of experiments to assess the rates of denitrification from deep soils and how this affected by specific agricultural practices.Denitrification represents one of the major pathways that biologically available nitrogen leaves terrestrial ecosystems, along with leaching, volatilization, and runoff, and is the only process capable of returning nitrogen to its inert form of dinitrogen gas. Understanding where and at what rate dinitrification occurs is fundamental to understanding the nitrogen cycle.

这篇博士论文改进项目将研究氮素从土壤到大气中的损失，这一过程被称为反硝化。传统上，人们认为反硝化作用主要发生在表层土壤中，但最近的证据表明，深层土壤也可以在氮素循环中发挥重要作用。该项目将进行一系列实验，以评估深层土壤的反硝化速率以及具体农业实践对反硝化的影响。反硝化是生物可用氮离开陆地生态系统的主要途径之一，与淋溶、挥发和径流一样，也是唯一能够将氮返回到其惰性形式的氮气中的过程。了解反硝化发生的地点和速度是理解氮循环的基础。