Dissertation Research: Anaerobic Mirobial Metabolism and the Biogeochemical Functioning of Wetlands

[00-72980] hamilton / WhitmireDDIG：厌氧微生物代谢和湿地的生物地球化学功能微生物分解有机物在湿地的功能中起着核心作用，并且这种分解大部分发生在缺氧条件下（例如厌氧条件）。厌氧微生物介导改变下游水质的化学转化，并向大气排放甲烷等温室气体，从而影响气候。通过了解微生物过程的性质和速率如何在广泛的湿地生态系统中变化，我们可以更好地预测干扰对湿地功能的影响。本研究将评估密歇根州各种湿地的这些微生物过程。将采用为海洋和地下水研究开发的技术来确定主要的微生物过程。要测量的物质包括溶解的氢气，一种普遍的分解媒介，以及厌氧代谢的化学副产物。具体的工艺速率，包括醋酸酯周转率和硫酸盐还原，将被测量以证实研究结果。

00-72980Hamilton / WhitmireDDIG: Anaerobic microbial metabolism and the biogeochemical functioning of wetlandsMicrobial decomposition of organic matter plays a central role in the functioning of wetlands, and much of this decomposition occurs in the absence of oxygen (e.g., anaerobic conditions). Anaerobic microorganisms mediate chemical transformations that alter downstream water quality, and emit greenhouse gases such as methane to the atmosphere, thereby affecting climate. By understanding how the nature and rates of microbial processes vary across a broad suite of wetland ecosystems, we can better predict the impacts of disturbance on the functions of wetlands. This research will evaluate these microbial processes in a variety of Michigan wetlands. Techniques developed for marine and groundwater studies will be employed to determine the dominant microbial processes. Substances to be measured will include dissolved hydrogen gas, a universal intermediary in decomposition, as well as chemical byproducts of anaerobic metabolism. Specific process rates, including acetate turnover and sulfate reduction, will be measured to corroborate the findings.