The Role of Bacterial Processes in the Biogeochemistry of Humic Substances in the Okefenokee Swamp Ecosystem

细菌在淡水和海洋环境中溶解有机物循环中的作用，目前所知甚少。然而，由于溶解有机物是生物圈最大的碳库之一，了解其形成和生物利用的过程对于全面了解全球碳循环至关重要。一类特殊的溶解有机物，腐殖质，是特别令人感兴趣的，因为它占溶解物质总量的很大一部分（在某些自然环境中高达80%），但在过去却很少被研究。我们建议研究美国东南部淡水湿地（奥克弗诺基沼泽生态系统）中溶解腐殖质回收（形成和利用）的细菌过程。

The role of bacteria in recycling dissolved organic matter in freshwater and marine environments is, at present, pooly known. Yet because dissolved organic matter is one of the largest pools of biospheric carbon, knowledge of the processes involved in its formation and biological utilization is essential for a full understanding of global carbon cycling. One particular class of dissolved organic matter, the humic substances, is of particular interest because it makes up a very large fraction of the total dissolved substances (up to 80% in some natural environments) but has been very poorly studied in the past. We propose to examine the bacterial processes involved in recycling (formation and utilization ) of dissolved humic substances in a freshwater wetland in the southeastern United States (the Okefenokee Swamp Ecosystem).