Stochastic modelling of development and biomass allocation: Computation applied to architecture of young mahogany trees (Khaya senegalensis Desr. A. Juss), a native African savannah emblematic agroforestry species

Adji Beda Innocent, Wang Xiujuan, Letort Véronique, Akaffou Doffou Sélastique, Sabatier Sylvie-Annabel, Kang Meng Zhen, Kouassi Kouadio Henri, Barima Yao Sadaiou Sabas, Duminil Jérôme, Jaeger Marc, De Reffye Philippe. 2024. Stochastic modelling of development and biomass allocation: Computation applied to architecture of young mahogany trees (Khaya senegalensis Desr. A. Juss), a native African savannah emblematic agroforestry species. Computers and Electronics in Agriculture, 220:108864, 17 p.

Url - jeu de données - Entrepôt autre : https://doi.org/10.7910/DVN/KCXY2Z

Résumé : The architectural plasticity forms observed in trees is a result of meristem functioning, which generates new organs and branches, and adjusts growth processes in response to heterogeneous climatic adaptations that affect biomass allocation. Analyzing this plasticity should enable the selection of adapted individuals for optimizing successful cropping systems. Mahogany tree (Khaya senegalensis) is a rhythmically growing indigenous agroforestry tree that is heavily exploited for its multiple uses. Understanding its growth characteristics, as well as the complexity of its structure (randomness, rhythmicity, etc. of Mahogany tree), could facilitate its conservation and sustainable management. This study aims to model the architecture and physiology of young mahogany trees based on field data using an organ-level structural–functional model called 'GreenLab', which is founded on source-sink relationships. Ninety trees aged 6, 12, and 24 months were measured in the field. Development was calculated using a dual-scale automaton based on the Monte Carlo process, while biomass production and its distribution to different plant organs (source and sink) were calibrated using Pressler's law using Markov chains. Meristematic activity laws, combined with organ sinks (D: Demand), photosynthesis (Q: Supply), and organic series (Q/D: Trophic pressure), were employed to simulate individual architecture. The results demonstrate that the model realistically and flexibly describes topological development and replicates biomass production and allocation processes for rhythmically growing trees. This model will enable the identification of mahogany ideotypes suited for enhancing agroforestry cropping systems based on this species and several other threatened species. These findings introduce and thus lay the groundwork for a computational plant model tailored to the needs of agroforestry from a novel perspective, offering new avenues for agronomic and forestry applications in West Africa and Côte d'Ivoire.

Mots-clés Agrovoc : agroforesterie, croissance, savane, port de la plante, biomasse, modèle de simulation, rendement des cultures, modèle stochastique, déboisement, Khaya, produit forestier non ligneux, modélisation des cultures, système de culture, développement biologique

Mots-clés géographiques Agrovoc : Côte d'Ivoire

Mots-clés libres : Khaya senegalensis, Agroforestry species, GreenLab, Structural-functional plant model, Tree architecture

Agences de financement hors UE : Ministry of Higher Education and Scientific Research of Côte d'Ivoire, Agence Française de Développement, Institut de Recherche pour le Développement

Projets sur financement : (FRA) Partenariat Rénové pour la Recherche au service du développement de la Côte d’Ivoire, (FRA) C2D Amruge (Ivory Coast)

Auteurs et affiliations

• Adji Beda Innocent, UJLG (CIV) - auteur correspondant
• Wang Xiujuan, CAS (CHN)
• Letort Véronique, Université Paris-Saclay (FRA)
• Akaffou Doffou Sélastique, UJLG (CIV)
• Sabatier Sylvie-Annabel, CIRAD-BIOS-UMR AMAP (FRA)
• Kang Meng Zhen, CAS (CHN)
• Kouassi Kouadio Henri, UJLG (CIV)
• Barima Yao Sadaiou Sabas, UJLG (CIV)
• Duminil Jérôme, IRD (FRA)
• Jaeger Marc, CIRAD-BIOS-UMR AMAP (FRA)
• De Reffye Philippe, Académie des sciences et lettres de Montpellier (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/613118/)

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