Aggregation of an individual-based space-dependent model of forest dynamics into distribution-based and space-independent models

Picard Nicolas, Franc Alain. 2001. Aggregation of an individual-based space-dependent model of forest dynamics into distribution-based and space-independent models. Ecological Modelling, 145 : 69-84.

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Economie-gestion

Résumé : A question addressed in forest modelling is: which level of detail is required to reproduce the ecosystem function? In this paper four versions of the same model of a natural rain-forest are compared. The most detailed is an individual-based distance-dependent model, where every individual is described and interacts with other trees through a spatially explicit neighbourhood. Performing aggregation on the stand description yields a distribution -based distance-dependent model. Applying the mean field approximation brings two distance-dependent models. Three of the four models appear to predict the same stationary state in the limit where the number of trees is infinite (individual-based distance-independent + distribution-based models). The individual-based distance-dependent model differs because of the occurrence of space-dependent effects. An alternative aggregation method based on moment equations is then suggested to render the space-dependent effects.

Mots-clés Agrovoc : forêt tropicale, dynamique des populations, modèle, distribution des populations

Classification Agris : F40 - Écologie végétale
U10 - Informatique, mathématiques et statistiques

Auteurs et affiliations

• Picard Nicolas, CIRAD-FORET-FORETS NATURELLES (MLI)
• Franc Alain, ENGREF (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/486491/)

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