Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018WR023703 |
Nitrate Pathways, Processes, and Timing in an Agricultural Karst System: Development and Application of a Numerical Model | |
Husic, A.1; Fox, J.2; Adams, E.2; Ford, W.3; Agouridis, C.3; Currens, J.4; Backus, J.4 | |
2019-03-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2019 |
卷号 | 55期号:3页码:2079-2103 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Nitrogen (N) contamination within agricultural-karst landscapes and aquifers is widely reported; however, the complex hydrological pathways of karst make N fate difficult to ascertain. We developed a hydrologic and N numerical model for agricultural-karst, including simulation of soil, epikarst, phreatic, and quick flow pathways as well as biochemical processes such as nitrification, mineralization, and denitrification. We tested the model on four years of nitrate (NO3-) data collected from a phreatic conduit and an overlying surface channel in the Cane Run watershed, Kentucky, USA. Model results indicate that slow to moderate flow pathways (phreatic and epikarst) dominate the N load and account for nearly 90% of downstream NO3- delivery. Further, quick flow pathways dilute NO3- concentrations relative to background aquifer levels. Net denitrification distributed across soil, epikarst, and phreatic water removes approximately 36% of the N inputs to the system at rates comparable to nonkarst systems. Evidence is provided by numerical modeling that NO3- accumulation via evapotranspiration in the soil followed by leaching through the epikarst acts as a control on spring NO3- concentration and loading. Compared to a fluvial-dominated immature karst system, mature-karst systems behave as natural detention basins for NO3-, temporarily delaying NO3- delivery to downstream waters and maintaining elevated NO3- concentrations for days to weeks after hydrologic activity ends. This study shows the efficacy of numerical modeling to elucidate complex pathways, processes, and timing of N in karst systems. |
英文关键词 | karst agriculture nitrate leaching pathways numerical model nutrient fate |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000464660000018 |
WOS关键词 | SEDIMENT CARBON FATE ; GROUNDWATER NITRATE ; INTEGRATED ASSESSMENT ; UNSATURATED ZONE ; NITROGEN-SOURCES ; EDWARDS AQUIFER ; CONDUIT-FLOW ; WATER ; SPRINGS ; CONTAMINATION |
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/181567 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Kansas, Dept Civil Environm & Architectural Engn, Lawrence, KS 66045 USA; 2.Univ Kentucky, Dept Civil Engn, Lexington, KY USA; 3.Univ Kentucky, Dept Biosyst & Agr Engn, Lexington, KY USA; 4.Kentucky Geol Survey, Lexington, KY USA |
推荐引用方式 GB/T 7714 | Husic, A.,Fox, J.,Adams, E.,et al. Nitrate Pathways, Processes, and Timing in an Agricultural Karst System: Development and Application of a Numerical Model[J]. WATER RESOURCES RESEARCH,2019,55(3):2079-2103. |
APA | Husic, A..,Fox, J..,Adams, E..,Ford, W..,Agouridis, C..,...&Backus, J..(2019).Nitrate Pathways, Processes, and Timing in an Agricultural Karst System: Development and Application of a Numerical Model.WATER RESOURCES RESEARCH,55(3),2079-2103. |
MLA | Husic, A.,et al."Nitrate Pathways, Processes, and Timing in an Agricultural Karst System: Development and Application of a Numerical Model".WATER RESOURCES RESEARCH 55.3(2019):2079-2103. |
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