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Nitrous oxide emission from grazing is low across a gradient of plant functional diversity and soil conditions

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DOI

  • John Kormla Nyameasem, The Council for Scientific and Industrial Research, Christian-Albrechts University
  • ,
  • Carsten S. Malisch, Christian-Albrechts University
  • ,
  • Ralf Loges, Christian-Albrechts University
  • ,
  • Friedhelm Taube, Christian-Albrechts University, Wageningen University
  • ,
  • Christof Klub, Christian-Albrechts University
  • ,
  • Iris Vogeler
  • Thorsten Reinsch, Christian-Albrechts University

Nitrous oxide (N2O) emissions from pastures can vary significantly depending on soil and environmental conditions, nitrogen (N) input, as well as the plant’s ability to take up the N. We tested the hypothesis that legume-based N sources are characterized by significantly lower emission factors than mineral N based dairy systems. Therefore, this study monitored N2O emissions for a minimum of 100 days and up to two growing seasons across a gradient of plant species diversity. Emissions were measured from both, grazed pastures and a controlled application of urine and dung using the static chamber method. About 90% of the accumulated N2O emissions occurred during the first 60-75 days. The average accumulated N2O emissions were 0.11, 0.87, 0.99, and 0.21 kg ha-1 for control, dung, urine patches, and grazed pastures, respectively. The N uptake efficiency at the excreta patch scale was about 70% for both dung and urine. The highest N2O-N emission factor was less than half compared with the IPCC default (0.3 vs. 0.77), suggesting an overestimation of N2O-N emissions from organically managed pastures in temperate climates. Plant diversity showed no significant effect on the N2O emissions. However, functional groups were significant (p < 0.05). We concluded that legume-containing pasture systems without a fertilizer addition generally appear capable of utilizing nitrogen inputs from excreta patches efficiently, resulting in low N2O emissions.

Original languageEnglish
Article number223
JournalAtmosphere
Volume12
Issue2
Number of pages26
DOIs
Publication statusPublished - Feb 2021

Bibliographical note

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

    Research areas

  • Grass-clover, Nitrous oxide emission, Organic n fertilization, Plant diversity, Rotational grazing

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