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Related Concept Videos

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Related Experiment Video

Updated: May 25, 2026

Assessment of Methane and Nitrous Oxide Fluxes from Paddy Field by Means of Static Closed Chambers Maintaining Plants Within Headspace
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Modelling nitrous oxide emissions from grazed grassland systems.

Junye Wang1, Laura M Cardenas, Tom H Misselbrook

  • 1Sustainable Soils and Grassland Systems Department, Rothamsted Research, North Wyke, Okehampton, Devon, UK. junye.wang@rothamsted.ac.uk

Environmental Pollution (Barking, Essex : 1987)
|January 17, 2012
PubMed
Summary

This study enhances the UK-DNDC model to better simulate nitrous oxide (N2O) emissions from grazed grasslands. Increased grazing intensity was found to significantly elevate N2O emissions, improving model accuracy for these vital ecosystems.

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Area of Science:

  • Environmental Science
  • Agricultural Science
  • Biogeochemistry

Background:

  • Grazed grasslands are crucial for the global carbon cycle and influence climate change via greenhouse gas emissions.
  • Existing process-based models face challenges in accurately representing grassland diversity and animal grazing impacts.
  • Accurate modeling of nitrous oxide (N2O) emissions from these systems is vital for climate change mitigation strategies.

Purpose of the Study:

  • To develop and validate an improved version of the UK-DNDC model incorporating detailed animal grazing practices.
  • To accurately simulate soil nitrogen biogeochemistry and N2O emissions under varying grazing intensities in the UK.
  • To enhance the predictive capability of biogeochemical models for grazed grassland ecosystems.

Main Methods:

  • Modification of the DeNitrification-DeComposition (DNDC) model to create the UK-DNDC version.
  • Integration of animal grazing parameters to track their influence on soil nitrogen dynamics.
  • Validation of the enhanced UK-DNDC model using N2O flux data from three contrasting UK field sites.

Main Results:

  • The modified UK-DNDC model demonstrated improved accuracy in simulating N2O emissions from grazed grasslands.
  • Model responses to changes in grazing parameters aligned well with observed N2O flux data.
  • A clear positive correlation was observed: increased grazing intensity led to higher N2O emissions.

Conclusions:

  • The enhanced UK-DNDC model provides a more robust tool for assessing N2O emissions from grazed grasslands.
  • Animal grazing intensity is a critical factor directly influencing N2O emissions in these ecosystems.
  • The improved model aids in developing targeted management strategies for mitigating greenhouse gas emissions from UK grasslands.