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Cited by 48Soil and Water Nutrient DynamicsConstructed Wetlands for Wastewater TreatmentSoil Carbon and Nitrogen Dynamics

Nitrous oxide generation, denitrification, and nitrate removal in a seepage wetland intercepting surface and subsurface flows from a grazed dairy catchment

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Zaman, M., Nguyen, M. L., Gold, A. J., Groffman, P. M., Kellogg, D. Q., Wilcock, R. J.·2008·Soil Research
DOI 10.1071/sr07217
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Abstract

Little is known about seepage wetlands, located within agricultural landscapes, with respect to removing nitrate (NO3−) from agricultural catchments, mainly through gaseous emissions of nitrous oxide (N2O) and dinitrogen (N2) via denitrification. These variables were quantified using a push–pull technique where we introduced a subsurface water plume spiked with 15N-enriched NO3− and 2 conservative tracers [bromide (Br−) and sulfur hexafluoride (SF6)] into each of 4 piezometers and extracted the plume from the same piezometers throughout a 48-h period. To minimise advective and dispersive flux, we placed each of these push–pull piezometers within a confined lysimeter (0.5 m diameter) installed around undisturbed wetland soil and vegetation. Although minimal dilution of the subsurface water plumes occurred, NO3−-N concentration dropped sharply in the first 4 h following dosing, such that NO3−-limiting conditions (<2 mg/L of NO3-N) for denitrification prevailed over the final 44 h of the experiment. Mean subsurface water NO3− removal rates during non-limiting conditions were 15.7 mg/L.day. Denitrification (based on the generation of isotopically enriched N2O plus N2) accounted for only 7% (1.1 mg/L.day) of the observed groundwater NO3− removal, suggesting that other transformation processes, such as plant uptake, were responsible for most of the NO3− removal. Although considerable increases in 15N-enriched N2O levels were initially observed following NO3− dosing, no net emissions were generated over the 48-h study. Our results suggest that this wetland may be a source of N2O emissions when NO3− concentrations are elevated (non-limited), but can readily remove N2O (function as a N2O sink) when NO3− levels are low. These results argue for the use of engineered bypass flow designs to regulate NO3− loading to wetland denitrification buffers during high flow events and thus enhance retention time and the potential for NO3−-limiting conditions and N2O removal. Although this type of management may reduce the full potential for wetland NO3− removal, it provides a balance between water quality goals and greenhouse gas emissions.

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  • Wetlands promote denitrification, but incomplete denitrification can lead to increased N2O emissions when NO3- concentrations are high, shifting the problem from water pollution to greenhouse gas emission.

    “Wetlands promote denitrification, but incomplete denitrification can lead to increased N 2 O emissions when NO 3 -concentrations are high, thereby shifting the problem from water pollution to greenhouse gas emission (Zaman et al., 2008).”

    From Long-term nitrate removal in a denitrification wall (2011) · cites this paper as Zaman et al., 2008

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Research works printed but not linked: 4

  1. Groffman PM, Holland E, Myrold DD, Robertson GP, Zou X (1999) Denitrification. In 'Standard methods for long term ecological research'. (Eds GP Robertson, CS Bledsoe, DC Coleman, P Sollins) pp. 272-288. (Oxford University Press: Oxford, UK)
  2. Nguyen ML, Eynon-Richards N, Barnett J (2002) Nitrogen removal by seepage wetland intercepting surface and subsurface flows from a dairy catchment in Waikato. In 'Proceedings of the Workshop on Dairy Farm Soil Management. Fertilizer & Lime Research Centre 15th Workshop'. 13-14 Feb. 2002. (Eds LD Currie, P Loganathan) pp. 219-225. (Massey University: Palmerston North, New Zealand)
  3. Schipper LA, Vojodic-Vukovic M (1998) Nitrate removal from ground water using denitrification wall amended with sawdust, field trials. Journal of Environmental Quality 27, 664-668.
  4. Tiedje JM (1982) Denitrification. In 'Methods of soil analysis'. Agronomy Monograph No. 9, Part 2, 2nd edn (Ed. AL Page) pp. 1011-1026. (American Society of Agronomy, Soil Science Society of America: Madison, WI)

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Authors
Zaman, M., Nguyen, M. L., Gold, A. J., Groffman, P. M., Kellogg, D. Q., & Wilcock, R. J.
Affiliations
  • ASummit-Quinphos (NZ) Ltd, Private Bag 3029, Waikato Mail Centre 3240, Hamilton, New Zealand.
  • International Atomic Energy Agency (AT)
  • University of Rhode Island (US)
  • Cary Institute of Ecosystem Studies (US)
  • National Institute of Water and Atmospheric Research (NZ)
Corresponding author
Zaman, M.
ORCID
Venue
Soil Research
Publisher
CSIRO Publishing
Published
2008-10-08
Volume
46
Issue
7
Pages
565-577
ISSN
  • 0004-9573 (ISSN-L)
  • 1838-675X
  • 1838-6768
DOI
10.1071/sr07217
OpenAlex
W2170465924
Cited by
48
References
75
Citations by year
2026: 4 · 2024: 2 · 2021: 4 · 2020: 2 · 2019: 1 · 2018: 4 · 2015: 3 · 2014: 5 · 2013: 5 · 2012: 7
FWCI
2.66
Type
journal article
Language
en
Open access
Licence
doi.org/10.1071/journalslicense (vor, 6074 d)
Locations
  • Soil Research (publishedVersion)
  • Journal of Media Literacy Education (submittedVersion, cc-by)
Funders
Foundation for Research, Science and Technology
Topics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Soil and Water Nutrient Dynamics
  • Physical Sciences › Environmental Science › Waste Management and Disposal › Constructed Wetlands for Wastewater Treatment
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
Keywords
nitrous oxide emissions, denitrification, nitrate removal, groundwater nitrate, 15N tracer, grazing, N2O sinks, greenhouse gas emissions reduction, agricultural water quality

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