Knowledge Resource Center for Ecological Environment in Arid Area
| 项目编号 | DE-SC0019424 |
| Physical, resource supply, and biological controls on nutrient processing along the river continuum | |
| Gonzalez-Pinzon, Ricardo | |
| 主持机构 | University of New Mexico |
| 开始日期 | 2018 |
| 结束日期 | 2020 |
| 资助经费 | 180500(USD) |
| 项目类别 | Grant |
| 资助机构 | US-DOE（美国能源部） |
| 语种 | 英语 |
| 国家 | 美国 |
| 中文简介 | Energy - Biological & Environmental Research |
| 英文简介 | Physical, resource supply, and biological controls on nutrient processing along the river continuumR. Gonzalez-Pinzon, University of New Mexico (Principal Investigator) D. J. Van Horn, University of New Mexico (Co-Investigator)J. Stegen, Pacific Northwest National Laboratory (Co-Investigator)Excess nutrient loading has negative ecological and engineering impacts observed in ~90% of the streams in the US. Due to the ubiquitous and dynamic interconnections between headwater streams, rivers, lakes, aquifers and coastal waters, eutrophication issues previously considered to be only localized have steadily grown and their damages to US surface and groundwater systems are estimated to cost ~100 billion dollars per-year (only for nitrogen eutrophication). Thus, there is a strong need to develop methods to predict the transport, uptake and export of nutrients along entire fluvial networks and their cumulative effects on surface and groundwater quality. Nutrient uptake and export dynamics are strongly controlled by: 1) transport with mass transfer to metabolically active zones, 2) resource related constraints including quality and stoichiometric limitations, and 3) biological uptake by aquatic microbial communities. We face key limitations in understanding nutrient dynamics because: 1) existing data are mainly representative of headwater streams (~90% of all experimental work reported), i.e., we lack consistent studies along entire fluvial networks, 2) we lack studies assessing stoichiometric controls on nutrient uptake as we have traditionally focused on solute-specific (e.g., only nitrogen) analyses, and 3) we lack studies linking microbial diversity and function with nutrient uptake dynamics along fluvial networks. These limitations hinder scientifically based restoration projects seeking to reduce the burden of eutrophication costs. The goal of this proposal is to develop a data-driven mechanistic understanding of the interactions between transport related processes (mass-transfer to metabolically active zones), resource supply dynamics (nutrient concentrations, stoichiometric constraints, etc.), and biological controls (microbial community structure and function), and how these key factors drive nutrient uptake along a river continuum. To achieve this goal, we will pursue three research objectives: RO1) Investigate how changes in river sediment texture control resource supply (mass-transfer to metabolically active zones), colonizable surface area and, in turn, biological nutrient uptake along the river continuum; RO2) Investigate nutrient uptake kinetics (i.e., uptake as a function of concentrations) along the river continuum considering: limiting vs. non-liming (i.e., stoichiometrically balanced) conditions, and labile vs. recalcitrant organic matter sources; and RO3) Investigate if differences in microbial diversity, community structure, and genomic potential exist along the river continuum and, if so, determine how they interact with resource supply to impose fundamental controls on nutrient uptake.We will perform our research in a river continuum that spans 4 orders of magnitude in mean annual discharge (100–103L/s), more than 2000 m in altitude, and more than 500 km of stream longitude. This watershed also hosts a population of ~1 million people, in urban (~85% population) and rural agricultural (~15%) areas, making it an ideal location for investigating coupled dynamics of human and river systems. Our research will directly support DOE’s mission to improve scientific understanding and prediction of the function of natural and managed watersheds. We will work closely with the PNNL Subsurface Biogeochemical Research (SBR) team, which focuses on understanding fine-, local-, reach- and regional-scale biogeochemical processes to become a pioneer on the integration of hydrobiogeochemical function of dynamic river corridor ecosystems. In developing our research, we will: 1) leverage resources available at or through PNNL (i.e., hyporheic instrumentation, resource characterization), 2) extend an experimental design developed by the PNNL team in the Columbia River to another arid land river site, the Rio Grande river, which has contrasting characteristics (high turbidity, fine grained substrate, lower flow regimes, agricultural and urban nutrient inputs), 3) expand the single-site understanding of hyporheic processing developed by PNNL at the Hanford Site to multiple sites along the Rio Grande river continuum (through our continuum scale experiments), and 4) co-advance efforts made by the two institutions to develop a local to watershed scale understanding of how hydrologic, geochemical, and microbial ecological processes affect biogeochemical dynamics.Our research will depart from the status quo of focusing on solute-specific, site-specific nutrient uptake analyses, which have resulted in unscalable frameworks, to incorporate a more holistic, stoichiometrically and microbially based, data-driven mechanistic understanding of nutrient uptake and export along fluvial networks. |
| 来源学科分类 | Energy - Biological & Environmental Research |
| URL | SN30538 |
| 资源类型 | 项目 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/356078 |
| 推荐引用方式 GB/T 7714 | Gonzalez-Pinzon, Ricardo.Physical, resource supply, and biological controls on nutrient processing along the river continuum.2018. |
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