Collaborative Research: Biogeochemistry of Dissolved Organic Matter in Pony Lake, Ross Island

合作研究：罗斯岛小马湖溶解有机物的生物地球化学

• 批准号: 0338299
• 负责人: Diane McKnight
• 金额: $ 28.46万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-06-01 至 2007-06-01
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0338299&HistoricalAwards=false
• 关键词: Collaborative; Research; Biogeochemistry; Dissolved; Organic

Dissolved organic matter (DOM) is a significant chemical component in aquatic systems because it acts as an important carbon source for microorganisms, absorbs harmful radiation in sunlight, is able to complex metals, and can participate in important biogeochemical reactions. This study will investigate the biogeochemical cycling of DOM in a small coastal Antarctic pond, Pony Lake, located on Cape Royds, Ross Island. Because there are no higher plants present at this site all of the DOM in this lake is derived from microorganisms. Thus, Pony Lake is an ideal site to study the effect of physical, chemical, and microbial processes on the composition and character of the DOM pool. Finally, Pony Lake is also an ideal site to collect an International Humic Substances Society (IHSS) fulvic acid standard. Unlike other IHSS standards, this standard will not contain DOM components derived from higher land plants. To better understand the role of physical influences, the project will study the changes in the DOM pool as the lake evolves from ice-covered to ice-free conditions during the summer, as well as the relationship of DOM to the observed turnover of dominant microbial communities in the lake. Scientists will also monitor changes in microbial abundance, diversity, and productivity that may occur during the ice to open-water transition period. This research will provide much needed information regarding the relationship between microbial diversity and DOM biogeochemistry. Middle school science students will be active participants in this project through the Internet, while scientists are in the field, and in the lab.

溶解的有机物（DOM）是水生系统中的重要化学成分，因为它充当微生物的重要碳源，吸收有害的阳光中的有害辐射，能够复杂金属，并且可以参与重要的生物地球化学反应。这项研究将调查位于罗斯岛角罗伊德斯角的小马湖的一个小型南极沿海池塘中DOM的生物地球化学循环。由于该地点没有较高的植物，该湖中的所有DOM均来自微生物。因此，小马湖是研究物理，化学和微生物过程对DOM池组成和特征的影响的理想场所。最后，小马湖也是收集国际腐殖质社会（IHSS）富氏酸标准的理想场所。与其他IHSS标准不同，该标准将不包含来自高层植物的DOM组件。为了更好地了解身体影响的作用，该项目将研究DOM池的变化，因为湖泊在夏季从冰覆盖到无冰条件，以及DOM与观察到的主要微生物周转率的关系湖中的社区。科学家还将监测在冰到开放水过渡期间可能发生的微生物丰度，多样性和生产力的变化。这项研究将提供有关微生物多样性与DOM生物地球化学之间关系的急需信息。中学科学专业的学生将通过互联网积极参与该项目，而科学家在现场和实验室中。