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.

湖泊和湿地被认为对全球碳循环有重大贡献，并可能在甲烷气体的生产中发挥特别重要的作用。 然而，控制湖泊甲烷排放速率的生物和物理机制却知之甚少。 该项目将研究湖泊中消耗甲烷的细菌（甲烷氧化菌）的多样性，并研究它们如何应对温度季节性变化和破坏性事件引起的湖泊混合变化。 否则，湖泊中甲烷氧化菌消耗的甲烷将被释放到大气中。 由于甲烷是在湖底附近产生和积累的，湖水柱的混合应该会破坏甲烷氧化菌的活动，加速甲烷的排放。 该项目将采用一种新颖的，全湖混合操作，研究甲烷氧化菌如何响应湍流混合，并比较这种反应，在大多数湖泊中发生的季节性更渐进的混合。 甲烷是一种强有力的温室气体，通过增加地球大气层对太阳能的吸收而导致全球变暖。 通过研究湖泊混合如何影响甲烷氧化菌组合和甲烷排放，该项目解决了连接湖泊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，也有助于更大的推广工作，从事K-12教师在湖泊生态和气候变化。