Modelling of daily fluxes of water and carbon from shortgrass steppes

Nouvellon Yann, Rambal Serge, Lo Seen Danny, Moran M. Susan, Lhomme J.P., Bégué Agnès, Chehbouni A. Ghani, Kerr Yann. 2000. Modelling of daily fluxes of water and carbon from shortgrass steppes. Agricultural and Forest Meteorology, 100 (2-3) : 137-153.

Autre titre : Modélisation des flux journaliers d'eau et de carbone dans des steppes à herbes basses

Résumé : A process-based model for semi-arid grassland ecosystems was developed. It is driven by standard daily meteorological data and simulates with a daily time step the seasonal course of root, aboveground green, and dead biomass. Water infiltration and redistribution in the soil, transpiration and evaporation are simulated in a coupled water budget submodel. The main plant processes are photosynthesis, allocation of assimilates between aboveground and belowground compartments, shoots and roots respiration and senescence, and litter fall. Structural parameters of the canopy such as fractional cover and LAI are also simulated. This model was validated in southwest Arizona on a semi-arid grassland site. In spite of simplifications inherent to the process-based modelling approach, this model is useful for elucidating interactions between the shortgrass ecosystem and environmental variables, for interpreting H2O exchange measurements, and for predicting the temporal variation of above- and belowground biomass and the ecosystem carbon budget.

Mots-clés Agrovoc : plante herbacée, steppe, croissance, modèle de simulation, zone semi-aride, mouvement de l'eau dans le sol, évapotranspiration, photosynthèse, respiration, cycle du carbone

Mots-clés géographiques Agrovoc : Arizona

Classification Agris : U10 - Informatique, mathématiques et statistiques
F60 - Physiologie et biochimie végétale
F61 - Physiologie végétale - Nutrition

Auteurs et affiliations

• Nouvellon Yann, CIRAD-AMIS (FRA) ORCID: 0000-0003-1920-3847
• Rambal Serge, CNRS (FRA)
• Lo Seen Danny, CIRAD-AMIS-AGRONOMIE (FRA) ORCID: 0000-0002-7773-2109
• Moran M. Susan, USDA (USA)
• Lhomme J.P., ORSTOM [Institut français de recherche scientifique pour le développement en coopération] (FRA)
• Bégué Agnès, CIRAD-AMIS-AGRONOMIE (FRA)
• Chehbouni A. Ghani, ORSTOM [Institut français de recherche scientifique pour le développement en coopération] (MEX)
• Kerr Yann, CESBIO (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/263484/)

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