Dissolved Organic Matter Biogeochemistry: Linking Ecosystem Processes, Community Structure and Microbial Dynamics in Streams

溶解有机质生物地球化学：将河流中的生态系统过程、群落结构和微生物动力学联系起来在这项研究中，研究人员在生态系统研究中提出了一个简单、关键但鲜为人知的问题：细菌群落如何处理河流中的溶解有机物？为了回答这个问题，包括来自5个机构的科学家和学生在内的私人投资机构将调查：1)特定溪流中溶解的有机食物资源和细菌消费者；2)水的有机化学和细菌群落的组成如何对季节性变化和其他干扰作出反应；3)细菌群落是否能够处理来自不同溪流和栖息地的有机物；以及4)细菌如何对其食物供应的数量和质量的变化做出反应。该项目连接了生物地球化学、微生物生态学和生态学理论三个学科。它还包括三个不同的生物群：东部落叶植物、南部针叶植物和热带常绿植物。除了有助于我们对河流生态系统和微生物生态学的基本理解外，这项研究还对饮用水的生物处理和有机污染环境的修复具有广泛的影响。

Abstract99-04047KaplanDissolved organic matter biogeochemistry: Linking ecosystem processes, community structure and microbial dynamics in streamsThe investigators in this research effort ask a simple, critical and little understood question in ecosystem studies: How do bacterial communities process dissolved organic matter in streams? To answer this question the PIs, including scientists and students from 5 institutions, will investigate: 1) what dissolved organic food resources and bacterial consumers are in a particular stream; 2) how the organic chemistry of the water and composition of the bacterial community respond to seasonal changes and other disturbances; 3) whether bacterial communities can process organic matter from different streams and habitats; and 4) how bacteria respond to changes in the quantity and quality of their food supply. This project bridges three disciplines: biogeochemistry, microbial ecology and ecological theory. It also encompasses three distinct biomes: Eastern deciduous, Southern coniferous and Tropical evergreen. Beyond contributions to our basic understanding of stream ecosystems and microbial ecology, this research has broad implications for the biological treatment of drinking waters and the remediation of organically polluted environments.