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Theses

Modélisation des bilans de gaz à effet de serre des agro-écosystèmes en Europe

Abstract : Agriculture accounts for 10-15 % of anthropogenic emissions of greenhouse gases (GHGs), which justifies that this sector must play a role in climate mitigation. The exchanges of GHGs between agro-ecosystems and the atmosphere involve three compounds: nitrous oxide (N2O), methane (CH4) and carbon dioxide (CO2). The prediction of GHG exchanges needs to take into account the underlying processes within the soil-crop system, that are tightly controlled by the agro-pedoclimatic conditions. Using biophysical models is currently a very promising approach in this direction, but still emerging. The central issue of this thesis is the prediction of the global warming potential of agro-ecosystems, based on biophysical modelling of agro-ecosystems and their GHG exchanges with the atmosphere. The model parameters were estimated using an original method of Bayesian calibration. Independant data sets were used to assess the error of model prediction for the simulation of N2O and CO2 fluxes at the plot scale. This model is now able to predict the GHG balance of cropping systems. The model application on experimental sites with contrasting soil and climatic conditions made it possible to quantify the global warming potential of cropping systems for entire crop rotations and to test various mitigation strategies. The use and development of the model in the perspective of spatial extrapolation can produce inventories of GHG emissions from croplands at regional scale.
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https://pastel.archives-ouvertes.fr/tel-00438077
Contributor : Simon Lehuger <>
Submitted on : Wednesday, December 2, 2009 - 10:56:14 AM
Last modification on : Monday, October 19, 2020 - 11:06:38 AM
Long-term archiving on: : Saturday, November 26, 2016 - 3:36:28 PM

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  • HAL Id : tel-00438077, version 1
  • PRODINRA : 248729

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Simon Lehuger. Modélisation des bilans de gaz à effet de serre des agro-écosystèmes en Europe. Sciences de la Terre. AgroParisTech, 2009. Français. ⟨NNT : 2009AGPT0022⟩. ⟨tel-00438077⟩

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