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Etude expérimentale et simulation des transferts hydriques dans les plantes individuelles application au caféier (Coffea arabica L.)

by Rapidel, B; Universite Montpellier II, Montpellier (Francia). Sciences et Techniques du Languedoc.
Publisher: Montpellier (Francia) 1995Description: 246 p.Subject(s): COFFEA ARABICA | BALANCE HIDRICO | TRANSPIRACION | MODELOS DE SIMULACION | APLICACIONES DEL COMPUTADOR | COFFEA ARABICA | WATER BALANCE | TRANSPIRATION | SIMULATION MODELS | COFFEA ARABICA | BILAN HYDRIQUE | TRANSPIRATION | MODELE DE SIMULATIONSummary: A model has been developed to compute the transpiration and the dynamic of water flows in individual plants, by J. Dauzat (Laboratoire de Modélisation, CIRAD-GERDAT). It is based on the use of computer representations plants (AMAP) to calculate the radiative balance and transpiration of each leaf. Input values needed to run this model on a coffee plantation in costa Rica have been measured during a work in CATIE (Centro Agronómico Tropical de Investigación y Enseñanza). We developed a model to calculate stomatal conductance of leaves using meteorological input data. Hydraulic architecture of coffee plants has been measured in the laboratory. Control measurements in the fields have been performed. The comparisons with outputs of the model show close correspondence. However, knowledge about eddy fluxes in arid above an heterogeneous canopy is lacking. Moreover, the soil water extraction has to be better taken into account. Comparisons between the results of this model and that of classical evapotranspiration models lead to identify the methodological contributions of this approach. From a practical point of view, this model should be useful simulating competitions in agroforestry systems. Simulations of shade effects on coffee transpiration are also discussed.
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33 fig. 84 gráf. 25 tab. Bib. p. 227-238. Sum. (En, Fr)

Tesis (Ph D)

A model has been developed to compute the transpiration and the dynamic of water flows in individual plants, by J. Dauzat (Laboratoire de Modélisation, CIRAD-GERDAT). It is based on the use of computer representations plants (AMAP) to calculate the radiative balance and transpiration of each leaf. Input values needed to run this model on a coffee plantation in costa Rica have been measured during a work in CATIE (Centro Agronómico Tropical de Investigación y Enseñanza). We developed a model to calculate stomatal conductance of leaves using meteorological input data. Hydraulic architecture of coffee plants has been measured in the laboratory. Control measurements in the fields have been performed. The comparisons with outputs of the model show close correspondence. However, knowledge about eddy fluxes in arid above an heterogeneous canopy is lacking. Moreover, the soil water extraction has to be better taken into account. Comparisons between the results of this model and that of classical evapotranspiration models lead to identify the methodological contributions of this approach. From a practical point of view, this model should be useful simulating competitions in agroforestry systems. Simulations of shade effects on coffee transpiration are also discussed.

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