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Modélisation de la croissance des peuplements réguliers de hêtre : dynamique des hiérarchies sociales et facteurs de production

Abstract : In order to build a growth simulator for even-aged stands of Common Beech (Fagus silvatica L.) under various management regimes, a distance-independant individual-tree model was developed, on the basis of repeated measures in long-term thinning trials. The method aimed at representing, in a simultaneous and coherent way, the effect of density and social status on growth, at both tree- and stand-level. The model is based on two assumptions concerning inter-tree competition. 1) One-sided vertical competition between social classes : the stand is organized in two subsystems, the main vegetation storey and the understorey ; the overstorey inhibits completely understorey growth, whereas understorey does not influence overstorey. 2) Horizontal competition in the overstorey : the growth of one tree depends of its social position and on the overstorey partial density. The two storeys are separated by a threshold dimension, the value of which depends on age and density of the stand. The rather simple mathematical formulation that was chosen allows an analytical study of the asymptotic behaviour of individual tree trajectories : the model predicts a continuous structuration of stands, as trees initially in the overstorey are progressively overtopped and drop back to the understorey ; the consequence of such social regressions is the development of bimodal distributions. The predictions are favourably tested against actual observations, especially in the case of situations differing markedly from those used to build the model. But some discrepancies still subsist between predictions and observations and let us argue that competition for light is not sufficient to account for the differences in the dynamics of various social classes : dissimilar stand functionning between periods of favourable water conditions and periods of water stress indicate that competition also exists between root systems. These results will lead to a more general formulation of the model, for a large range of ecological conditions and, possibly, for other species
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  • HAL Id : hal-02709446, version 1
  • PRODINRA : 16548

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Jean-Francois Dhote. Modélisation de la croissance des peuplements réguliers de hêtre : dynamique des hiérarchies sociales et facteurs de production. Annales des sciences forestières, INRA/EDP Sciences, 1991, 48 (4), pp.389-417. ⟨hal-02709446⟩

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