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Bilans carbonés et hydriques de plantations à croissance rapide d'Eucalyptus : modélisation et extrapolation spatiale de la parcelle à la région

Abstract : Industrial Eucalyptus plantations are expanding rapidly in many tropical regions, and in particular in south-eastern Brazil. Their sustainability and environmental impact are an issue of concern, and questions have been raised regarding their carbon balance and effects on soil fertility and water ressources. This thesis addresses some of these questions, by studying the carbon, water and nitrogen balance of Eucalyptus plantations in São Paulo State. A process-based modelling approach was adopted, with the ultimate aim of application at the scale of large plantations. A first empirical approach was developed to estimate wood production on a spatial basis, involving the construction and interpretation of MODIS vegetation index time series on a set of Eucalyptus stands of contrasted age and productivity levels. The complete ecophysiological C-H2O-N cycling model "G'DAY" was then adapted for Brazilian plantations. Rotation-length simulations of C, H2O and N fluxes were carried out on the afore-mentioned set of plantation stands, either with or without the integration of leaf area index data obtained from MODIS reflectance time-series. The satellite time series carry useful information about the spatio-temporal variability of productivity, which is also well reproduced by the proposed ecophysiological model
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Claire Marsden. Bilans carbonés et hydriques de plantations à croissance rapide d'Eucalyptus : modélisation et extrapolation spatiale de la parcelle à la région. Sylviculture, foresterie. Université Henri Poincaré - Nancy 1, 2010. Français. ⟨NNT : 2010NAN10084⟩. ⟨tel-01746347⟩

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