The Biogeochemistry of Manganese in the Great Lakes

五大湖中锰的生物地球化学

• 批准号: 8812694
• 负责人: Kenneth Nealson
• 金额: $ 33.79万
• 依托单位: University of Wisconsin-Milwaukee
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-10-15 至 1992-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8812694&HistoricalAwards=false
• 关键词: Biogeochemistry; Manganese; Great; Lakes

Manganese undergoes dynamic redox cycling between reduced Mn(II) and manganese oxides. These transfers dominate the biogeochemical behavior of manganese in natural waters and sediments. Although the manganese redox cycle is likely to have a major impact on the chemistry of other elements, particularly carbon, such effects have not been widely studied. Thus manganese serves as a redox catalysts for the transfer of electrons between organic matter and molecular oxygen and plays an important role in the overall redox chemistry of sediments. By studying the microbial and abiotic reduction of manganese oxides in sediments, the work fills an important gap in our knowledge of elemental redox cycles in sediments, particularly with respect to understanding the role of manganese in the oxidation of organic carbon. Biogeochemical cycling of manganese in this large freshwater system will provide an understanding of how this element relates to the carbon cycle. Previous notions about how manganese is reduced in anoxic environments have recently been changed by studies in Lake Oneida and the Black Sea. These distinct regions have sulfide in common, however the dominant cause of manganese reduction was due to organisms above the sulfide interface. This rather surprising result adds impact to these studies in Green Bay indicates that the results may be extrapolated to many other freshwater and marine environments. It is important to oceanographers as well as meteorologists to know how carbon is exchanged and cycled throughout the ocean.

锰在还原的Mn（II） 和氧化锰。 这些转让占主导地位， 锰在天然沃茨中的地球化学行为 沉积物 虽然锰的氧化还原循环可能具有 对其他元素的化学性质产生重大影响， 碳，这种影响还没有得到广泛的研究。 因此 锰作为氧化还原催化剂， 有机物和分子氧之间的电子， 在沉积物的整体氧化还原化学中起重要作用。 通过研究微生物和非生物对锰的还原作用， 沉积物中的氧化物，这项工作填补了我们的一个重要空白 沉积物中元素氧化还原循环的知识，特别是 了解锰在环境中的作用 有机碳的氧化。 这一大型淡水中锰的生物地球化学循环 系统将提供对该元素如何关联的理解 到碳循环。 以前关于锰是如何 在缺氧环境中减少，最近已经改变， 在奥奈达湖和黑海的研究。 这些不同的区域 有硫化物的共同点，但锰的主要原因 还原是由于硫化物界面上方的有机体。 这 一个相当令人惊讶的结果增加了对这些研究的影响，在绿色 贝指出，结果可以外推到许多其他 淡水和海洋环境。 重要的是要 海洋学家和气象学家来了解碳是如何 在整个海洋中交换和循环。