DOI: 10.1016/j.watres.2018.11.082
Scopus记录号: 2-s2.0-85058372730
论文题名: Coupling stable isotopes and water chemistry to assess the role of hydrological and biogeochemical processes on riverine nitrogen sources
作者: Hu M. ; Liu Y. ; Zhang Y. ; Dahlgren R.A. ; Chen D.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 418
结束页码: 430
语种: 英语
英文关键词: Dual stable isotopes
; Legacy effect
; Nitrogen dynamics
; Source identification
Scopus关键词: Catchments
; Groundwater
; Groundwater flow
; Groundwater geochemistry
; Groundwater pollution
; Hydrochemistry
; Isotopes
; Land use
; Nitrogen
; Nitrogen oxides
; Rivers
; Runoff
; Soil pollution control
; Soils
; Water pollution control
; Watersheds
; Biogeochemical process
; Legacy effect
; Nitrification and denitrification
; Nitrogen dynamics
; Source identification
; Stable isotopes
; Temporal variability
; Water pollution control strategies
; River pollution
; ground water
; nitrogen
; nitrous oxide
; rain
; river water
; stable isotope
; catchment
; groundwater
; hydrochemistry
; nitrogen
; nitrous oxide
; nonpoint source pollution
; rainfall
; river discharge
; river water
; seasonal variation
; source identification
; spatial variation
; stable isotope
; water chemistry
; watershed
; Article
; biogeochemistry
; catchment
; China
; concentration (parameters)
; denitrification
; hydrology
; land use
; nitrification
; nitrogen dynamics
; priority journal
; river
; seasonal variation
; soil
; waste water
; water pollution control
; water quality
; watershed
; China
; Fujian
; Yongan
英文摘要: Accurate source identification is critical for optimizing water pollution control strategies. Although the dual stable isotope ( 15 N-NO 3 - / 18 O-NO 3 - ) approach has been widely applied for differentiating riverine nitrogen (N) sources, the relatively short-term (<1 yr) 15 N-NO 3 - / 18 O-NO 3 - records typically used in previous studies often hinders rigorous assessment due to high temporal variability associated with watershed N dynamics. Estimated contributions of legacy N sources in soils and groundwater to riverine N export by modeling approaches in many previous studies also lack validation from complementary information, such as multiple stable isotopes. This study integrated three years of multiple stable isotope ( 15 N-NO 3 - / 18 O-NO 3 - and 2 H-H 2 O/ 18 O-H 2 O) and hydrochemistry measurements for river water, groundwater and rainfall to elucidate N dynamics and sources in the Yongan watershed (2474 km 2 ) of eastern China. Nonpoint source N pollution dominated and displayed considerable seasonal and spatial variability in N forms and concentrations. Information from δ 15 N-NO 3 - and δ 18 O-NO 3 - indicated that riverine N dynamics were regulated by contributing sources, nitrification and denitrification, as well as hydrological processes. For the three examined catchments and entire watershed, slow subsurface and groundwater flows accounted for >75% of river discharge and were likely the major hydrological pathways for N delivery to the river. Riverine NO 3 − sources varied with dominant land use (p < 0.001), with the highest contributions of groundwater (60%), wastewater (35%), and soil (50%) occurring in agricultural, residential and forest catchments, respectively. For the entire watershed, groundwater (∼50%) and soil N (>30%) were the dominant riverine NO 3 − sources, implying considerable potential for N pollution legacy effects. Results were consistent with observed nitrous oxide dynamics and N sources identified in previous modeling studies. As the first attempt to apply multiple isotope tracers for exploring and quantifying N transformation and transport pathways, this study provides an integrated approach for verifying and understanding the N pollution legacy effects observed in many watersheds worldwide. This study highlights that river N pollution control in many watersheds requires particular attention to groundwater restoration and soil N management in addition to N input control strategies. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122079
Appears in Collections: 气候变化事实与影响
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作者单位: College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, 310058, China; Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Zhejiang University, Hangzhou, 310058, China; Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, Zhejiang University, Hangzhou, 310058, China; Department of Land, Air, and Water Resources, University of California, Davis, CA 95616, United States
Recommended Citation:
Hu M.,Liu Y.,Zhang Y.,et al. Coupling stable isotopes and water chemistry to assess the role of hydrological and biogeochemical processes on riverine nitrogen sources[J]. Water Research,2019-01-01