Ponds and Streams: Hydrological, Biogeochemical and Water Quality Function

池塘和溪流：水文、生物地球化学和水质功能

• 批准号: 0711006
• 负责人: Craig Tobias
• 金额: $ 19.02万
• 依托单位: University of Connecticut
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-03-01 至 2013-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0711006&HistoricalAwards=false
• 关键词: Ponds; Streams; Hydrological; Biogeochemical; Water

Ponds and Streams: Hydrological, Biogeochemical and Water Quality FunctionThis project will develop and expand a stoichiometric Process Vector visualization and quantification approach to identify (on the timescale of hours) biogeochemical processes in streams and to quantify fundamental biogeochemical reaction rates. By developing methods to identify/quantify controlling metabolic processes for CO2 production, nitrification, denitrification and redox release of PO4 from FePO4 via multi-parameter measures at high frequencies, the hydrologic community will be better enabled to evaluate the spatial and temporal variability (time step 10-75min) of the water quality controls in shallow aquatic systems. The project will develop and deploy new instrumentation to quantify the biogeochemical water quality function of a small pond and two low order streams by combining a pumped-profiler/YSI system (O2, CO2, temperature, pH turbidity, fluorescence and specific conductivity) and an Envirotech Microlab nutrient analyzer system for NO3+NO2, NH3, and PO4 and a METS methane sampler. A measurement interval of 10mins is anticipated with week long deployments in ponds and multi-day deployments in streams. This suite of measurements covers the anticipated dominant metabolic reaction pathways for most streams/ponds over a wide Eh/pH range. The new suite of instrumentation will be deployed in a small suburban pond that undergoes a range of rapidly changing biogeochemical conditions driven in part by physical processes; this data will enable a broad range of biogeochemical processes to be observed and compared to theory. The equipment will also be deployed in two low order streams that cover a range of environments. The analysis will enable an elucidation of hydrologic, meteorologic, stratification and destratification controls on the biogeochemical function of detention ponds (a hydrologic component growing at 4%/yr) and the biogeochemical function of low order streams that represent an important component of the hydrologic network.

池塘和溪流：水文、生物地球化学和水质功能本项目将开发和扩展化学计量过程矢量可视化和量化方法，以识别（以小时为时间尺度）溪流中的生物地球化学过程，并量化基本的生物地球化学反应速率。 通过开发方法来识别/量化控制代谢过程的CO2生产，硝化，反硝化和氧化还原释放的PO 4从FePO 4通过多参数测量在高频率，水文社区将能够更好地评估空间和时间的变化（时间步长10- 75分钟）的水质控制在浅水系统。 该项目将开发和部署新的仪器，通过结合泵送剖面仪/YSI系统（O2，CO2，温度，pH浊度，荧光和比电导率）和用于NO3+NO2，NH3和PO 4的Envirotech Microlab营养分析仪系统以及METS甲烷采样器，量化一个小池塘和两个低阶流的生物地球化学水质功能。 预计测量间隔为10分钟，在池塘中部署一周，在溪流中部署多日。这套测量涵盖了预期的主要代谢反应途径，大多数溪流/池塘在很宽的Eh/pH值范围。这套新的仪器将部署在一个小的郊区池塘，经历了一系列快速变化的地球化学条件，部分由物理过程驱动;这些数据将使广泛的地球化学过程被观察到，并与理论进行比较。这些设备还将部署在两个低序流中，覆盖一系列环境。该分析将能够阐明水文，气象，分层和去分层控制滞洪池（一个水文组件增长4%/年）的生态地球化学功能和代表水文网络的重要组成部分的低阶流的生态地球化学功能。