Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017WR020607 |
Reducing equifinality using isotopes in a process-based stream nitrogen model highlights the flux of algal nitrogen from agricultural streams | |
Ford, William I.1; Fox, James F.1; Pollock, Erik2 | |
2017-08-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:8 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The fate of bioavailable nitrogen species transported through agricultural landscapes remains highly uncertain given complexities of measuring fluxes impacting the fluvial N cycle. We present and test a new numerical model named Technology for Removable Annual Nitrogen in Streams For Ecosystem Restoration (TRANSFER), which aims to reduce model uncertainty due to erroneous parameterization, i.e., equifinality, in stream nitrogen cycle assessment and quantify the significance of transient and permanent removal pathways. TRANSFER couples nitrogen elemental and stable isotope mass-balance equations with existing hydrologic, hydraulic, sediment transport, algal biomass, and sediment organic matter mass-balance subroutines and a robust GLUE-like uncertainty analysis. We test the model in an agriculturally impacted, third-order stream reach located in the Bluegrass Region of Central Kentucky. Results of the multiobjective model evaluation for the model application highlight the ability of sediment nitrogen fingerprints including elemental concentrations and stable N isotope signatures to reduce equifinality of the stream N model. Advancements in the numerical simulations allow for illumination of the significance of algal sloughing fluxes for the first time in relation to denitrification. Broadly, model estimates suggest that denitrification is slightly greater than algal N sloughing (10.7% and 6.3% of dissolved N load on average), highlighting the potential for overestimation of denitrification by 37%. We highlight the significance of the transient N pool given the potential for the N store to be regenerated to the water column in downstream reaches, leading to harmful and nuisance algal bloom development. |
英文关键词 | fluvial nitrogen algae modeling sediment isotopes multiobjective equifinality |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000411202000012 |
WOS关键词 | PARTICULATE ORGANIC-MATTER ; PARAMETER UNCERTAINTY ; CARBON ; DENITRIFICATION ; DECOMPOSITION ; NITRATE ; WATER ; SENSITIVITY ; SEDIMENT ; GRADIENT |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/21013 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Kentucky, Lexington, KY 40506 USA; 2.Univ Arkansas, Stable Isotope Lab, Fayetteville, AR 72701 USA |
推荐引用方式 GB/T 7714 | Ford, William I.,Fox, James F.,Pollock, Erik. Reducing equifinality using isotopes in a process-based stream nitrogen model highlights the flux of algal nitrogen from agricultural streams[J]. WATER RESOURCES RESEARCH,2017,53(8). |
APA | Ford, William I.,Fox, James F.,&Pollock, Erik.(2017).Reducing equifinality using isotopes in a process-based stream nitrogen model highlights the flux of algal nitrogen from agricultural streams.WATER RESOURCES RESEARCH,53(8). |
MLA | Ford, William I.,et al."Reducing equifinality using isotopes in a process-based stream nitrogen model highlights the flux of algal nitrogen from agricultural streams".WATER RESOURCES RESEARCH 53.8(2017). |
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