气候变化领域集成服务门户(CCPortal): High-frequency NO3 - isotope (δ15N; δ18O) patterns in groundwater recharge reveal that short-term changes in land use and precipitation influence nitrate contamination trends

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DOI	10.5194/hess-22-4267-2018
	High-frequency NO3 - isotope (δ15N; δ18O) patterns in groundwater recharge reveal that short-term changes in land use and precipitation influence nitrate contamination trends
	Suchy M.; Wassenaar L.I.; Graham G.; Zebarth B.
发表日期	2018
ISSN	1027-5606
起始页码	4267
结束页码	4279
卷号	22 期号:8
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).
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
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159946
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
推荐引用方式 GB/T 7714	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],2018,22(8).
APA	Suchy M.,Wassenaar L.I.,Graham G.,&Zebarth B..(2018).High-frequency NO3 - isotope (δ15N; δ18O) patterns in groundwater recharge reveal that short-term changes in land use and precipitation influence nitrate contamination trends.Hydrology and Earth System Sciences,22(8).
MLA	Suchy M.,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".Hydrology and Earth System Sciences 22.8(2018).