MSB: Dissertation Research: Methanotroph dynamics in response to lake mixing

MSB：论文研究：甲烷氧化菌动力学响应湖泊混合

• 批准号: 0910297
• 负责人: Katherine McMahon
• 金额: $ 0.75万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-07-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0910297&HistoricalAwards=false
• 关键词: MSB; Dissertation; Research; Methanotroph; dynamics

Lakes and wetlands are believed to contribute substantially to global carbon cycling, and may play an especially important role in production of methane gas. However, the biological and physical mechanisms that control rates of methane emission from lakes are poorly understood. This project will study the diversity of bacteria that consume methane in lakes (methanotrophs) and examine how they respond to changes in lake mixing caused by seasonal changes in temperature and by disruptive events. Methane consumed by methanotrophs in lakes would otherwise be released into the atmosphere. Since methane is created and accumulates largely near the bottom of lakes, mixing of the lake water column should disrupt the activities of methanotrophs and accelerate methane emission. This project will employ a novel, whole lake mixing manipulation to study how methanotrophs respond to turbulent mixing, and compare that response to the more gradual mixing that occurs seasonal in most lakes. Methane is a potent greenhouse gas that contributes to global warming by increasing absorption of solar energy in Earth's atmosphere. By studying how lake mixing impacts the methanotroph assemblage and methane emission, this project addresses an important feedback linking lake ecosystems and global climate warming. This project supports the thesis research of a doctoral student, and also contributes to a larger outreach effort that engages K-12 teachers in lake ecology and climate change.

据信湖泊和湿地有助于全球碳循环，并且在甲烷气体的生产中可能起着特别重要的作用。 但是，对控制湖泊甲烷排放速率的生物学和物理机制知之甚少。 该项目将研究在湖泊中消耗甲烷（甲烷营养）的细菌的多样性，并研究它们如何应对因温度季节性变化和破坏性事件而导致的湖泊混合变化的反应。 否则，湖泊中甲烷营消耗的甲烷将被释放到大气中。 由于产生甲烷并在很大程度上积聚在湖泊底部附近，因此湖水柱的混合应破坏甲烷营养的活性和加速甲烷的发射。 该项目将采用一种新颖的全湖混合操作来研究甲烷营养如何对湍流混合的反应，并将这种反应与大多数湖泊中季节性发生的更逐渐的混合进行比较。 甲烷是一种有效的温室气体，通过增加地球大气中太阳能的吸收来促进全球变暖。 通过研究湖泊混合如何影响甲烷营养的组合和甲烷排放，该项目解决了将湖生态系统和全球气候变暖的重要反馈。 该项目支持博士生的论文研究，并为更大的外展工作做出了贡献，使K-12教师参与湖泊生态和气候变化。