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Modélisation du partage de la lumière dans l'association de cultures blé - pois (Triticum aestivum L. - Pisum sativum L.). Une approche de type plante virtuelle.

Abstract : Cereal-legume intercropping systems are assumed to provide efficient and sustainable agrosystems. However, the proportion of each species in the stand, as well as their productivity, are highly related to the trade-off between the interspecific competition and their complementarity. Light partitioning between the cereal and the legume is therefore a determinant of the mixture functioning. The physical structure of the canopy, which drives light interception, emerges from the above-ground architecture of the individuals growing within the stand. In order to assess the relationships between plant architecture and light partitioning in wheat-pea mixtures (Triticum aestivum L.-Pisum sativum L), a 3D model of the above-ground morphogenesis of pea, so called L-Pea, was built up based on the virtual plant approach. Experiments were conducted in order to i) characterize the morphogenesis of contrasting pea genotypes grown under different conditions (greenhouse/field, pure/mixture), and ii) to model the above-ground architecture of pea. A tripartite simulator, integrating the L-Pea model, ADEL-Wheat an (architectural model of wheat) and CARIBU (a radiative transfer model), was then built up in order to study the architectural determinism of light partitioning in wheat-pea mixtures. This simulator furthermore demonstrates that architectural parameters (e.g. branches, internodes) are able to significantly and dynamically affect light partitioning and thus the mixture development. The present thesis contributes i) to demonstrate the pertinence of the virtual plant approach for accounting of light partitioning in mixtures and ii) to the selection/building of cultivars/ideotypes suited for multispecific stands.
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Romain Barillot. Modélisation du partage de la lumière dans l'association de cultures blé - pois (Triticum aestivum L. - Pisum sativum L.). Une approche de type plante virtuelle.. Agronomie. Université d'Angers, 2012. Français. ⟨tel-00854575⟩

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