Dataset

Denitrification and Denitrifying Efficiencies in Sediments of Port Phillip Bay: Direct Determinations of Biogenic N2 and N-metabolite Fluxes with Implications for Water Quality

Australian Ocean Data Network
Heggie, D.T. ; Skyring, G.W. ; Orchardo, J. ; Longmore, A.R. ; Nicholson, G.J ; Berelson, W.M.
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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=http://catalogue.aodn.org.au/geonetwork/srv/eng/metadata.show?uuid=a05f7892-f041-7506-e044-00144fdd4fa6&rft.title=Denitrification and Denitrifying Efficiencies in Sediments of Port Phillip Bay: Direct Determinations of Biogenic N2 and N-metabolite Fluxes with Implications for Water Quality&rft.identifier=http://catalogue.aodn.org.au/geonetwork/srv/eng/metadata.show?uuid=a05f7892-f041-7506-e044-00144fdd4fa6&rft.publisher=Commonwealth of Australia (Geoscience Australia)&rft.description=High-precision measurements of N2 in benthic chamber waters indicated that denitrification occurs within the major sedimentary facies in Port Phillip Bay. The integrated fluxes of biogenic N2 , ammonia, nitrate and nitrite showed that the stoichiometric relationship between organic C and N in the muddy sediments, occupying about 70% of the seafloor, was 5.7, this being similar to the Redfield ratio of 6.6. High denitrifying efficiencies (75-85%; denitrification rates ~1.3 mmol N2 m-2 day-1) at organic carbon loadings of ~15-25 mmol m-2 day-1 indicate that most N processed through the sediments was returned to the overlying waters as biologically (generally) unavailable N2. At sites of high organic carbon loadings to the sediments (>100 mmol m-2 day-1) denitrification rates and denitrifying efficiencies were near zero and most N is returned to the Bay waters as biologically available ammonium. In chambers 'spiked' with 15NO3 , denitrifyers used nitrate produced in the sediments in situ, rather than the exogenous nitrate in overlying waters. The sedimentary microbial processes of ammonification, nitrification and denitrification are therefore tightly coupled.Unknown&rft.creator=Heggie, D.T. &rft.creator=Skyring, G.W. &rft.creator=Orchardo, J. &rft.creator=Longmore, A.R. &rft.creator=Nicholson, G.J &rft.creator=Berelson, W.M. &rft.date=2015&rft.coverage=northlimit=-37.8; southlimit=-38.4; westlimit=144.3; eastLimit=145.1&rft.coverage=northlimit=-37.8; southlimit=-38.4; westlimit=144.3; eastLimit=145.1&rft_rights=license&rft_rights=Creative Commons Attribution 4.0 International Licence&rft_subject=geoscientificInformation&rft_subject=External Publication&rft_subject=Scientific Journal Paper&rft_subject=marine&rft_subject=marine biodiversity&rft_subject=Earth Sciences&rft.type=dataset&rft.language=English Access the data

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High-precision measurements of N2 in benthic chamber waters indicated that denitrification occurs within the major sedimentary facies in Port Phillip Bay. The integrated fluxes of biogenic N2 , ammonia, nitrate and nitrite showed that the stoichiometric relationship between organic C and N in the muddy sediments, occupying about 70% of the seafloor, was 5.7, this being similar to the Redfield ratio of 6.6. High denitrifying efficiencies (75-85%; denitrification rates ~1.3 mmol N2 m-2 day-1) at organic carbon loadings of ~15-25 mmol m-2 day-1 indicate that most N processed through the sediments was returned to the overlying waters as biologically (generally) unavailable N2. At sites of high organic carbon loadings to the sediments (>100 mmol m-2 day-1) denitrification rates and denitrifying efficiencies were near zero and most N is returned to the Bay waters as biologically available ammonium. In chambers 'spiked' with 15NO3 , denitrifyers used nitrate produced in the sediments in situ, rather than the exogenous nitrate in overlying waters. The sedimentary microbial processes of ammonification, nitrification and denitrification are therefore tightly coupled.

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Issued: 1999

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145.1,-37.8 145.1,-38.4 144.3,-38.4 144.3,-37.8 145.1,-37.8

144.7,-38.1

text: northlimit=-37.8; southlimit=-38.4; westlimit=144.3; eastLimit=145.1

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Other Information
View the online abstract in Marine and Freshwater Research, Vol. 50, pp. 589-596.

doi : http://dx.doi.org/10.1071/MF98054

View the online abstract in Marine and Freshwater Research, Vol. 50, pp. 589-596.

Identifiers
  • global : a05f7892-f041-7506-e044-00144fdd4fa6