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A modeling approach to determine the importance of dynamic regulation of plant hydraulic conductivities on the water uptake dynamics in the soil-plant-atmosphere system

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  • Lobet, Guillaume
  • Pagès, Loïc
  • Draye, Xavier

Abstract

We present here a new model, PlaNet-Maize, with the purpose of investigating the effect of environmental and endogenous factors on the growth and water relations of the maize plant. This functional–structural plant model (FSPM) encompasses the entire soil-plant-atmosphere continuum with a sub-organ resolution. The model simulates the growth and development of an individual maize plant and the flux of water through the plant structure, from the rhizosphere to the leaf boundary layer. Leaf stomatal conductance and root radial and axial conductivities are considered as functions of local water potential. Finally, a simple carbon allocation rule is included in the model to allow the feedback effect of water deficit on plant growth. The model was successfully used to reproduce experimental plant hydraulic behavior in response to water deficit. The quantitative contribution of leaf conductance and root conductivities were assessed individually and in combination.

Suggested Citation

  • Lobet, Guillaume & Pagès, Loïc & Draye, Xavier, 2014. "A modeling approach to determine the importance of dynamic regulation of plant hydraulic conductivities on the water uptake dynamics in the soil-plant-atmosphere system," Ecological Modelling, Elsevier, vol. 290(C), pages 65-75.
    • Handle: RePEc:eee:ecomod:v:290:y:2014:i:c:p:65-75
    DOI: 10.1016/j.ecolmodel.2013.11.025
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    References listed on IDEAS

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    1. Kang, Shaozhong & Liang, Zongsuo & Pan, Yinhua & Shi, Peize & Zhang, Jianhua, 2000. "Alternate furrow irrigation for maize production in an arid area," Agricultural Water Management, Elsevier, vol. 45(3), pages 267-274, August.
    2. Diggle, A.J, 1988. "Rootmap: a root growth model," Mathematics and Computers in Simulation (MATCOM), Elsevier, vol. 30(1), pages 175-180.
    3. Drouet, Jean-Louis & Pagès, Loïc, 2007. "GRAAL-CN: A model of GRowth, Architecture and ALlocation for Carbon and Nitrogen dynamics within whole plants formalised at the organ level," Ecological Modelling, Elsevier, vol. 206(3), pages 231-249.
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