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Past and future scenarios of the effect of carbon dioxide on plant growth and transpiration for three vegetation types of southwestern France

Calvet J, Gibelin A, Roujean J, Martin E, Le Moigne P, Douville H, Noilhan J ...see all

Atmos. Chem. Physics, vol. 8, issue 2 (2008) pp. 397-406

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The sensitivity of an operational CO2-responsive land surface model
(the ISBA-A-gs model of Meteo-France) to the atmospheric CO2 concentration,
(CO2), is investigated for 3 vegetation types (winter wheat, irrigated
maize, coniferous forest). Past (1960) and future (2050) scenarios
of (CO2) corresponding to 320 ppm and 550 ppm, respectively, are
explored. The sensitivity study is performed for 4 annual cycles
presenting contrasting conditions of precipitation regime and air
temperature, based on continuous measurements performed on the SMOSREX
site near Toulouse, in southwestern France. A significant CO2-driven
reduction of canopy conductance is simulated for the irrigated maize
and the coniferous forest. The reduction is particularly large for
maize, from 2000 to 2050 (-18%), and triggers a drop in optimum
irrigation (-30 mm y(-1)). In the case of wheat, the response is
more complex, with an equal occurrence of enhanced or reduced canopy

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  • J -C. Calvet

  • A -L. Gibelin

  • J -L. Roujean

  • E Martin

  • P Le Moigne

  • H Douville

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