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

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Created 13/01/2025

Updated 13/01/2025

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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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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
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/379c23c3-460c-4960-a380-f025a8ac93b9
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 22/04/2018
Geospatial Coverage {"type": "Polygon", "coordinates": [[[144.3, -38.4], [145.1, -38.4], [145.1, -37.8], [144.3, -37.8], [144.3, -38.4]]]}
Data Portal data.gov.au

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This dataset was originally found on data.gov.au "Denitrification and Denitrifying Efficiencies in Sediments of Port Phillip Bay: Direct Determinations of Biogenic N2 and N-metabolite Fluxes with Implications for Water Quality". Please visit the source to access the original metadata of the dataset:
https://devweb.dga.links.com.au/data/dataset/denitrification-and-denitrifying-efficiencies-in-sediments-of-port-phillip-bay-direct-determina

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