Denitrification and the Microbial Nitrogen Cycle in a Pelagic Oxygen Minimum Zone

远洋最低氧区的反硝化和微生物氮循环

• 批准号: 9530187
• 负责人: Joseph Montoya
• 金额: $ 17万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-06-15 至 1998-09-10
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9530187&HistoricalAwards=false
• 关键词: Denitrification; Microbial; Nitrogen; Cycle; Pelagic

9530187 MONTOYA Denitrification (=respiration of oxidized nitrogen to dinitrogen gas) results in the loss, from the biosphere, of combined nitrogen, a critical nutrient for plant growth. The magnitude of denitrification affects the rates of decomposition of organic matter in the water column. Changes in these rates can alter the balance between the amount of carbon that reaches the deep ocean and the amount of CO2 available in the atmosphere. The project will be conducted in the Eastern Tropical North Pacific where suitably low oxygen waters persist. Various measurements of denitrification in this environment will address research questions that are crucial to understanding nitrogen and carbon cycling in the ocean. State-of-practice N-15 techniques and isotope ratio mass spectrometry will be used to determine dinitrification rates. ***

9530187蒙托亚的反硝化作用(=氧化氮气的呼吸作用为氮气)导致生物圈中的结合氮--植物生长的关键营养物质--的损失。反硝化作用的大小影响水体中有机物的分解速度。这些速率的变化可能会改变到达深海的碳量和大气中可利用的二氧化碳之间的平衡。该项目将在东热带北太平洋进行，那里持续存在适当的低氧水域。在这种环境中对反硝化作用的各种测量将解决对理解海洋中的氮和碳循环至关重要的研究问题。将使用实用的N-15技术和同位素比质谱仪来确定反硝化率。***