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Related Experiment Video

Updated: Jun 27, 2026

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
07:59

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors

Published on: December 6, 2018

Modelling denitrification at the catchment scale.

Francois Oehler1, Patrick Durand, Paul Bordenave

  • 1ENSAT, UMR5245, LABoratoire d'ECOlogie fonctionnelle, BP 32607 Auzeville-Tolosane, F-31326 Castanet-Tolosan Cedex, France. f.oehler@niwa.co.nz

The Science of the Total Environment
|December 11, 2008
PubMed
Summary
This summary is machine-generated.

Heterotrophic denitrification significantly impacts nitrogen surpluses at the catchment scale. Both riparian and hillslope soils contribute substantially to nitrogen removal, highlighting the importance of these processes in managing nitrogen pollution.

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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
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The Benthic Exchange of O2, N2 and Dissolved Nutrients Using Small Core Incubations
10:11

The Benthic Exchange of O2, N2 and Dissolved Nutrients Using Small Core Incubations

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Related Experiment Videos

Last Updated: Jun 27, 2026

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
07:59

Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors

Published on: December 6, 2018

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
08:05

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O

Published on: October 7, 2020

The Benthic Exchange of O2, N2 and Dissolved Nutrients Using Small Core Incubations
10:11

The Benthic Exchange of O2, N2 and Dissolved Nutrients Using Small Core Incubations

Published on: August 3, 2016

Area of Science:

  • Environmental Science
  • Hydrology
  • Biogeochemistry

Background:

  • Nitrogen surpluses in catchments pose environmental challenges.
  • Understanding nitrogen fate is crucial for water quality management.
  • Heterotrophic denitrification plays a key role in nitrogen removal.

Purpose of the Study:

  • To evaluate the significance of heterotrophic denitrification in nitrogen surplus management at the catchment scale.
  • To spatialize denitrification processes using a modified hydrological model.

Main Methods:

  • Modification and calibration of the TNT2 model's denitrification module.
  • Simulation of daily water and nitrogen fluxes in a small catchment.
  • Spatial analysis of denitrification in riparian and hillslope zones.

Main Results:

  • The modified TNT2 model accurately simulated daily water and nitrogen fluxes (Nash 0.85 and 0.77).
  • Modeled denitrification rates aligned well with measurements (R=0.68).
  • Atmospheric nitrogen flux (4.70 g N m(-2) year(-1)) was comparable to stream soluble N flux.

Conclusions:

  • Riparian denitrification is important, but hillslope soils also contribute significantly (60%) to overall catchment denitrification.
  • The model successfully reproduced spatial denitrification patterns.
  • Temporal variations in denitrification and nitrate concentrations remain complex due to high fertilizer inputs.