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Nutrient Cycling in Agroecosystems

, Volume 48, Issue 1–2, pp 105–114 | Cite as

N2O and CH4 emissions from fertilized agricultural soils in southwest France

  • C. Jambert
  • R. Delmas
  • D. Serça
  • L. Thouron
  • L. Labroue
  • L. Delprat
Article

Abstract

Emissions of nitrogen compounds from heavily fertilized and irrigated maize fields have been studied in the Southwest of France, over an annual cultivation cycle. Strong nitrous oxide emissions from denitrification were observed after application of nitrogen fertilizer. Flux intensity appears to be stimulated by rain or irrigation. Emission algorithms, taking into account both nitrogen input and soil water content were established on the basis of the experimental data set. They allowed us to estimate annual nitrogen loss in the form of nitrous oxide modulated by rainfall. Production of methane is observed at the level of the water table under anoxic conditions. Nevertheless, the net flux between soil and atmosphere is negative for most of the time. When methane is produced, fluxes were very low due to methane oxidation in the soil surface layer.

agriculture fertilizer methane nitrous oxide soil water content 

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Copyright information

© Kluwer Academic Publishers 1997

Authors and Affiliations

  • C. Jambert
    • 1
  • R. Delmas
    • 1
  • D. Serça
    • 1
  • L. Thouron
    • 1
  • L. Labroue
    • 1
  • L. Delprat
    • 2
  1. 1.Laboratoire d'Aérologie (UMR CNRS-UPS 5560), O.M.P.ToulouseFrance
  2. 2.Station d'Agronomie, INRAVillenave d'Ornon CedexFrance

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