PDG-Arena: An ecophysiological model for characterizing tree-tree interactions in heterogeneous stands - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Preprints, Working Papers, ... Year : 2024

PDG-Arena: An ecophysiological model for characterizing tree-tree interactions in heterogeneous stands

Abstract

In the context of ongoing climate and biodiversity crises, mixed forest stands are increasingly considered as a sustainable management alternative to mono-cultures. We developed a new individual-based and process-based forest growth model, PDG-Arena, to simulate mixed forest functioning and test ecophysiological interactions among trees in mixed stands. The model builds upon of a validated ecophysiological stand-scale model and integrates tree competition for light and water. We evaluated the simulation performance of PDG-Arena using annual growth data from 39 common beech and silver fir monospecific and mixed plots in the French Alps. PDG-Arena showed similar performance as the validated stand-scale model when simulating even-age and monospecific forests, and significantly better performance when using structure-diverse and species-diverse inventories. It also showed a significant positive effect of species mixing on gross primary production, canopy absorbance and transpiration. Our results thus show that tree-level process-based models such as PDG-Arena, formally simulating interspecific interactions, are needed to better understand and simulate the functioning of mixed stands.
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hal-04618761 , version 1 (20-06-2024)

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Camille Rouet, Hendrik Davi, Arsène Druel, Bruno Fady, Xavier Morin. PDG-Arena: An ecophysiological model for characterizing tree-tree interactions in heterogeneous stands. 2024. ⟨hal-04618761⟩
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