The Role of Sediment-Water Column Biogeochemical Feedback in Eutrophication Dynamics of the Neuse River Estuary, NC

摘要：研究人员将在北卡罗莱纳州纽斯河河口开展一项氮驱动的富营养化的外系统尺度研究，其中将调查外部供应（“新”）氮负荷与其在浮游植物繁殖、相关碳通量和由此产生的沉积物需氧量（SOD）中的作用之间的联系。工作的具体方面将包括调查形成水华的浮游植物群体对来自人为来源的特定形式的氮的选择性反应，这些群体对超氧化物歧化酶的影响，以及水华介导的超氧化物歧化酶对沉积物-水柱碳和氮通量的影响。此外，还将研究底水含氧量对沉积氮循环的影响。该提案是根据环境地球化学和生物地球化学招标NSF- 99-9提交的，由海洋科学部、地球科学部和化学与运输系统部联合资助。

ABSTRACTThe investigators will perform an exosystem-scale study of nitrogen-driven eutrophication in the Neuse River Estuary, North Carolina, in which linkages between externally-supplied ("new") nitrogen loading and its role in phytoplankton blooms, associated carbon flux and the resulting sediment oxygen demand (SOD) will be investigated. Specific aspects of the work will includ investigation of selective responses of bloom-forming phytoplankton groups to specifc forms of nitrogen from anthropogenic sources, the effect of these groups on SOD, and the impact of bloom mediated SOD on sediment-water column carbon and nitrogen fluxes. Additionally, the effects of bottom-water oxygen levels on sedimentary nitrogen cycling will be studied.The proposal was submitted in reponse to the Envirnmental Geochemistry and Biogeochemistry solicitation NSF- 99-9, and is being funded jointly by the Divisions of Ocean Science, Earth Sciences, and Chemical and Transport systems.