globalchange  > 气候变化与战略
DOI: 10.5194/hess-22-4267-2018
论文题名:
High-frequency NO3 - isotope (δ15N; δ18O) patterns in groundwater recharge reveal that short-term changes in land use and precipitation influence nitrate contamination trends
作者: Suchy M.; Wassenaar L.I.; Graham G.; Zebarth B.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2018
卷: 22, 期:8
起始页码: 4267
结束页码: 4279
语种: 英语
Scopus关键词: Agriculture ; Aquifers ; Contamination ; Groundwater pollution ; Groundwater resources ; Isotopes ; Land use ; Manures ; Nitrates ; Stochastic systems ; Agricultural practices ; Ground water recharge ; Groundwater nitrates ; High frequency HF ; Nitrate contamination ; Precipitation events ; Shallow groundwater ; Synthetic fertilizers ; Fertilizers ; agricultural practice ; aquifer ; concentration (composition) ; denitrification ; groundwater ; land use change ; management practice ; manure ; nitrate ; nitrogen isotope ; pollutant source ; precipitation (chemistry) ; recharge ; transboundary pollution ; trend analysis ; Abbotsford-Sumas Aquifer ; Rubus glaucus ; Vaccinium
英文摘要: Poultry manure is the primary cause of nitrate (NO3 -) exceedances in the transboundary Abbotsford-Sumas aquifer (ASA; Canada-USA) based on synoptic surveys two decades apart, but questions remained about seasonal and spatial aspects of agricultural nitrate fluxes to the aquifer to help better focus remediation efforts. We conducted over 700 monthly δ15N and δ18O of nitrate assays, focusing on shallow groundwater (<5 years old) over a 5-year period to gain new insight on spatiooral sources and controls of groundwater nitrate contamination. NO3 - concentrations in these wells ranged from 1.3 to 99mgNL-1 (n Combining double low line 1041) with a mean of 16.2±0.4mgNL-1. The high-frequency 15N and 18O isotope data allowed us to identify three distinctive NO3 - source patterns: (i) primarily from synthetic fertilizer, (ii) dynamic changes in nitrate due to changes in land use, and (iii) from a mix of poultry manure and fertilizer. A key finding was that the source(s) of nitrate in recharge could be quickly influenced by short-term near-field management practices and stochastic precipitation events, which ultimately impact long-term nitrate contamination trends. Overall, the isotope data affirmed a subtle decadal-scale shift in agricultural practices from manure increasingly towards fertilizer nitrate sources; nevertheless, poultry-derived N remains a predominant source of nitrate contamination. Because the aquifer does not generally support denitrification, remediation of the Abbotsford-Sumas aquifer is possible only if agricultural N sources are seriously curtailed, a difficult proposition due to longstanding high-value intensive poultry and raspberry and blueberry operations over the aquifer. © 2018 Author(s).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163229
Appears in Collections:气候变化与战略

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作者单位: Suchy, M., Environment and Climate Change Canada, 201-401 Burrard St., Vancouver, BC, Canada; Wassenaar, L.I., International Atomic Energy Agency, Vienna International Centre, Vienna, 1400, Austria; Graham, G., Environment and Climate Change Canada, 201-401 Burrard St., Vancouver, BC, Canada; Zebarth, B., Fredericton Research and Development Centre, Agriculture and Agri-Food Canada, 850 Lincoln Rd., Fredericton, NB E3B 4Z7, Canada

Recommended Citation:
Suchy M.,Wassenaar L.I.,Graham G.,et al. High-frequency NO3 - isotope (δ15N; δ18O) patterns in groundwater recharge reveal that short-term changes in land use and precipitation influence nitrate contamination trends[J]. Hydrology and Earth System Sciences,2018-01-01,22(8)
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