Publications des agents du Cirad


Interactions of pulsed fires and water in tree--grass savanna ecosystems

Tchuinte Tamen A., Dumont Y., Bowong S., Tewa J.J., Couteron P.. 2016. Biomath Communications, 3 (1) : 1 p.. International Conference on Mathematical Methods and Models in Biosciences and School for Young Scientists, 2016-06-19/2016-06-25, Blagoevgrad (Bulgarie).

DOI: 10.11145/cb.v3i1.633

In [1,2], we have developed and compared two variants of a minimalistic tree-grass model which account for fire as periodic pulse events using impulsive differential equations (IDEs). Our models explicitly consider both a generic non-linear increasing function of grass and the response function of woody biomass to fire intensity. In particular, in [2], this fire response function has been choosen nonlinear in order to recover various bistability situations and periodic equilibria in different ecological regions. In recent papers, some authors proposed to take into account soil water because it is directly related to the hydrologic cycle (rainfall) and the climate forcing on the ecological system. Thus, based on our previous models, we build a new model involving water competition in addition to fire responses. We analyze the new system and compared to the previous models. We will illustrate our discussions with several numerical simulations. (Texte intégral)

Mots-clés : savane; arbre forestier; compétition végétale; incendie spontané; Écologie; Écologie du feu; Écologie forestière; dynamique des populations; régime hydrique du sol; modèle mathématique; feu de brousse

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