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Probabilistic soil moisture dynamics of water- and energy-limited ecosystems

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  • Muñoz, Estefanía
  • Ochoa, Andrés

    (Universidad Nacional de Colombia)

  • Poveda, Germán
  • Rodríguez-Iturbe, Ignacio

Abstract

This paper presents an extension of the stochastic ecohydrological model for soil moisture dynamics at a point of Rodriguez-Iturbe et al. (1999) and Laio et al. (2001). In the original model, evapotranspiration is a function of soil moisture and vegetation parameters, so that the model is suitable for water-limited environments. Our extension introduces a dependence on maximum evapotranspiration of available solar radiation, and thus our extended model is suitable for both water- and energy-limited environments. Furthermore, an analysis of the daily relationship between available energy for photosynthesis and transpiration through the stomatal conductance is carried out. This study regards the Penman-Monteith equation to model transpiration, the Leuning's stomatal conductance approach, the C3 photosynthesis model of Farquhar et al., and the FLUXNET database. Results are upscaled from half-hourly to daily scale, introducing an expression of transpiration in terms of the available radiation. The sensitivity of the model is analyzed using four dimensionless groups, and the long-term water balance is evaluated for distinct values of available energy.

Suggested Citation

  • Muñoz, Estefanía & Ochoa, Andrés & Poveda, Germán & Rodríguez-Iturbe, Ignacio, 2020. "Probabilistic soil moisture dynamics of water- and energy-limited ecosystems," Earth Arxiv au4tb, Center for Open Science.
    • Handle: RePEc:osf:eartha:au4tb
    DOI: 10.31219/osf.io/au4tb
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    References listed on IDEAS

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    1. De Michele, C. & Vezzoli, R. & Pavlopoulos, H. & Scholes, R.J., 2008. "A minimal model of soil water–vegetation interactions forced by stochastic rainfall in water-limited ecosystems," Ecological Modelling, Elsevier, vol. 212(3), pages 397-407.
    2. Manzoni, Stefano & Katul, Gabriel & Fay, Philip A. & Polley, H. Wayne & Porporato, Amilcare, 2011. "Modeling the vegetation–atmosphere carbon dioxide and water vapor interactions along a controlled CO2 gradient," Ecological Modelling, Elsevier, vol. 222(3), pages 653-665.
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