High-precision measurements of N2 in benthic chamber waters indicated that denitrification occurs within the major sedimentary facies in Port Phillip Bay. The dataset, from Geoscience Australia Data, contains integrated fluxes of biogenic N2, ammonia, nitrate, and nitrite, showing a stoichiometric relationship between organic C and N of 5.7 in muddy sediments covering about 70% of the seafloor. Denitrifying efficiencies were measured at 75-85% with rates of ~1.3 mmol N2 m-2 day-1 at organic carbon loadings of ~15-25 mmol m-2 day-1.
Use Cases
- Modeling nitrogen budgets for coastal ecosystems based on measured N2, ammonia, nitrate, and nitrite fluxes.
- Assessing water quality impacts based on the relationship between organic carbon loading and denitrification efficiency.
- Studying sediment microbial coupling based on the described processes of ammonification, nitrification, and denitrification.
- Calibrating biogeochemical models with direct determinations of biogenic N2 fluxes and denitrification rates.
Strengths
- Provides high-precision direct measurements of biogenic N2 fluxes, a key metric for denitrification.
- Reports specific stoichiometric relationships (C:N ratio of 5.7) and efficiency ranges (75-85%) for muddy sediments covering about 70% of the seafloor.
- Includes measurements from experimental chambers 'spiked' with 15NO3, indicating the source of nitrate used by denitrifiers.
Limitations
- Column-level documentation is absent; field semantics must be inferred after download.
- Row count is unknown, which may limit suitability assessment for large-scale modeling.
- Data may reflect geographic bias inherent to data_gov_au, being specific to Port Phillip Bay.
Provenance
- Source
- Geoscience Australia Data
- Collection Method
- High-precision measurements from benthic chamber waters.
- Time Range
- null
- Freshness
- Last updated 2026-04-20 01:37:10.761185; freshness should be verified.
- Geography
- Port Phillip Bay