Nitrogen cycling dynamics in a humid subtropical climate: insights from the Nogoa River sub-catchment, central Queensland, Australia

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dc.contributor.authorHarris, SJen_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorPeterson, MAen_AU
dc.contributor.authorHankin, SIen_AU
dc.contributor.authorWatson, Jen_AU
dc.contributor.authorXiao, Sen_AU
dc.contributor.authorKelly, BFJen_AU
dc.date.accessioned2022-10-24T01:38:48Zen_AU
dc.date.available2022-10-24T01:38:48Zen_AU
dc.date.issued2019-04-07en_AU
dc.date.statistics2021-12-24en_AU
dc.description.abstractThe Nogoa River sub-catchment, Queensland, Australia, supports a multimillion-dollar agricultural sector. For the last decade, efforts have been made to monitor river nitrate loads (Fitzroy partnership for River Health, 2017), which may affect sensitive ecosystems downstream, such as the World Heritage-listed Great Barrier Reef (Brodie et al. 2012). Research into nitrous oxide, which arises from both the oxidation of ammonium fertilisers and/or reduction of subsequent nitrate, is also very important due to its increasing impact on the atmosphere. An integrated approach that considers the interactions between atmosphere, river water and groundwater nitrogen compounds is thus integral to closing the nitrogen cycle in the region. Nitrogen fertiliser contributions to greenhouse gas emissions, riverine environments and aquifers remain uncertain for several reasons: (1) ad-hoc river water sampling frequency and infrequent shallow groundwater sampling; (2) a lack of isotopic evidence for attributing sources and highlighting attenuation processes; (3) poor understanding of groundwater recharge pathways, residence times, and contributions to the Nogoa River; and (4) a lack of quantification of river water and groundwater nitrous oxide concentrations and emissions. In this poster, we present hydro-geochemical data (major ions, N2O-N, δ2H-H2O and δ18O-H2O, δ15N-NO-3 and δ18O-NO- 3, and natural radioactive tracers) from seven sites along the Nogoa River that were repeatedly sampled over a 1-year period, and from 24 shallow groundwater bores sampled in October 2018. A comparison with historical major ion groundwater data reveals that nitrate concentrations have increased due to continued fertiliser input over the past ∽ 20 years, reaching up to 25 mg L-1 NO- 3 -N. Dual nitrate isotopes (δ15N and δ18O) reveal that denitrification occurs in both the shallow groundwater and Nogoa River samples, and suggest a predominant fertiliser source of nitrate. The data will be placed in the wider context of recharge pathways, residence times and contributions to the Nogoa River, and will be used to understand the interplay between the river and alluvial aquifer nitrate and nitrous oxide emissions. © Author(s) 2019. CC Attribution 4.0 license.en_AU
dc.identifier.articlenumberEGU2019-6249en_AU
dc.identifier.booktitleGeophysical Research Abstractsen_AU
dc.identifier.citationHarris, S. J., Cendón, D. I., Peterson, M. A., Hankin, S. I., Watson, J., Xiao, S., & Kelly, B. F. (2019) Nitrogen cycling dynamics in a humid subtropical climate: insights from the Nogoa River sub-catchment, central Queensland, Australia. EGU General Assembly 2019, Vienna, Austria, 7-12 April 2019. In Geophysical Research Abstracts, Vol. 21, EGU2019-6249. Retrieved from: https://meetingorganizer.copernicus.org/EGU2019/EGU2019-6249.pdfen_AU
dc.identifier.conferenceenddate12 April 2019en_AU
dc.identifier.conferencenameEGU General Assembly 2019en_AU
dc.identifier.conferenceplaceVienna, Austriaen_AU
dc.identifier.conferencestartdate7 April 2019en_AU
dc.identifier.otherEGU2019-6249en_AU
dc.identifier.otherBG1.7en_AU
dc.identifier.urihttps://meetingorganizer.copernicus.org/EGU2019/EGU2019-6249.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13916en_AU
dc.identifier.volume21en_AU
dc.language.isoenen_AU
dc.publisherCopernicus Publicationsen_AU
dc.subjectNitrogenen_AU
dc.subjectQueenslanden_AU
dc.subjectAustraliaen_AU
dc.subjectRiversen_AU
dc.subjectClimatesen_AU
dc.subjectReefsen_AU
dc.subjectFertilizersen_AU
dc.subjectGround wateren_AU
dc.subjectAquifersen_AU
dc.titleNitrogen cycling dynamics in a humid subtropical climate: insights from the Nogoa River sub-catchment, central Queensland, Australiaen_AU
dc.typeConference Abstracten_AU
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