DOI: 10.5194/hess-20-3099-2016
Scopus记录号: 2-s2.0-84982748019
论文题名: Real-time monitoring of nitrate transport in the deep vadose zone under a crop field-implications for groundwater protection
作者: Turkeltaub T ; , Kurtzman D ; , Dahan O
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2016
卷: 20, 期: 8 起始页码: 3099
结束页码: 3108
语种: 英语
Scopus关键词: Agriculture
; Crops
; Decision making
; Fertilizers
; Groundwater pollution
; Groundwater resources
; Isotopes
; Land use
; Leaching
; Nitrates
; Nitrogen
; Nitrogen fertilizers
; Solvents
; Water pollution
; Water quality
; Agricultural land use
; Agricultural management
; Convection-dispersion equations
; Ground water protection
; Groundwater resource management
; Nitrate concentration
; Nitrogen transformations
; Real time monitoring
; Groundwater
; agricultural land
; chemical pollutant
; decision making
; groundwater
; groundwater pollution
; monitoring system
; nitrate
; nitrogen isotope
; nonpoint source pollution
; percolation
; pollutant transport
; real time
; transformation
; vadose zone
; vertical migration
; water management
; water table
英文摘要: Nitrate is considered the most common non-point pollutant in groundwater. It is often attributed to agricultural management, when excess application of nitrogen fertilizer leaches below the root zone and is eventually transported as nitrate through the unsaturated zone to the water table. A lag time of years to decades between processes occurring in the root zone and their final imprint on groundwater quality prevents proper decision-making on land use and groundwater-resource management. This study implemented the vadose-zone monitoring system (VMS) under a commercial crop field. Data obtained by the VMS for 6 years allowed, for the first time known to us, a unique detailed tracking of water percolation and nitrate migration from the surface through the entire vadose zone to the water table at 18.5ĝ€m depth. A nitrate concentration time series, which varied with time and depth, revealed - in real time - a major pulse of nitrate mass propagating down through the vadose zone from the root zone toward the water table. Analysis of stable nitrate isotopes indicated that manure is the prevalent source of nitrate in the deep vadose zone and that nitrogen transformation processes have little effect on nitrate isotopic signature. The total nitrogen mass calculations emphasized the nitrate mass migration towards the water table. Furthermore, the simulated pore-water velocity through analytical solution of the convection-dispersion equation shows that nitrate migration time from land surface to groundwater is relatively rapid, approximately 5.9 years. Ultimately, agricultural land uses, which are constrained to high nitrogen application rates and coarse soil texture, are prone to inducing substantial nitrate leaching. © Author(s) 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78770
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Hydrology and Microbiology, Zuckerberg Institute for Water Research, Ben Gurion University of the Negev, Negev, Israel; Institute of Soil, Water and Environmental Sciences, Volcani Center, Agricultural Research Organization, P.O. Box 6, Bet Dagan, Israel
Recommended Citation:
Turkeltaub T,, Kurtzman D,, Dahan O. Real-time monitoring of nitrate transport in the deep vadose zone under a crop field-implications for groundwater protection[J]. Hydrology and Earth System Sciences,2016-01-01,20(8)