EGB: Biogeochemical Processing of Bloom-Derived Organic Matter as a Function of Sediment Mixing Regime

EGB：水华衍生有机物质的生物地球化学处理作为沉积物混合机制的函数

• 批准号: 9807588
• 负责人: Ming-Yi Sun
• 金额: $ 37.5万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-09-01 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9807588&HistoricalAwards=false
• 关键词: EGB; Biogeochemical; Processing; Bloom; Derived

ENVIRONMENTAL GEOCHEMISTRY AND BIOGEOCHEMISTRY PROGRAMABSTRACT9807588Sun, et. al.This proposal brings together a highly interdisciplinary group of PIs to study the processing of algal carbon and nitrogen in sediments. It is hypothesized that sediment reworking under three different mixing regimes - bioturbated, unmixed and episodically mixed - will have a direct effect on organic matter processing. State of the art sediment geochemical techniques will be used to characterize the sediments and a large suite of biogeochemical tracers will be monitored in sediment mesocosms to which dual labeled (13C and 15N) algal material is added as a novel tracer of organic cycling. Microbial community structure will also be followed using molecular biological techniques. Oscillation of reactants between oxic and anoxic conditions is thought to be critical for organic matter degradation and nutrient cycling. These oscillations can be triggered by natural events (storms, for example) and man made impacts (eutrophication, for example). The results of the work will therefore have broad impact on our understanding of the health of the coastal ocean.This proposal was part of the Environmental Geochemistry and Biogeochemistry program. It will be jointly funded by the Division of Ocean Sciences, Division of Chemical and Transport Systems, and the Division of Earth Sciences.

环境地球化学和生物地球化学计划摘要9807588孙，等。该提案汇集了高度跨学科的 PI 小组，研究沉积物中藻类碳和氮的处理。 据推测，在三种不同混合方式（生物扰动、非混合和偶发混合）下的沉积物再加工将对有机物处理产生直接影响。 最先进的沉积物地球化学技术将用于表征沉积物，并且将在沉积物介层中监测大量生物地球化学示踪剂，其中添加双标记（13C和15N）藻类材料作为有机循环的新型示踪剂。 微生物群落结构也将利用分子生物学技术进行追踪。 反应物在有氧和缺氧条件之间的振荡被认为对于有机物降解和养分循环至关重要。 这些振荡可能是由自然事件（例如风暴）和人为影响（例如富营养化）引发的。 因此，这项工作的结果将对我们对沿海海洋健康的理解产生广泛的影响。该提案是环境地球化学和生物地球化学计划的一部分。 该项目将由海洋科学部、化学与运输系统部和地球科学部共同资助。