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Adaptation of the GreenLab model for analyzing sink-source relationships in chinese pine saplings

Guo H., Letort V., Hong L., Fourcaud T., Cournède P.H., Lu Y., De Reffye P.. 2007. In : Fourcaud Thierry (ed.), Zhang Xiao-Peng (ed.). Plant growth modeling and applications. Proceedings PMA06 : The Second International Symposium on plant growth modeling, simulation, visualization and applications, Beijing, China, November 13-17, 2006. Los Alamitos : IEEE Computer Society, p. 236-243. International Symposium on Plant Growth Modeling, Simulation, Visualization and Applications (PMA06). 2, 2006-11-13/2006-11-17, Beijing (Chine).

DOI: 10.1109/PMA.2006.32

Since the 1990s, a new generation of models has emerged to simulate tree growth with consideration of both tree structure and functional processes. However, calibration of these functional-structural models (FSMs) often remains an open problem due to the topological complexity of trees and to the heavy measurements required. In this paper, we explore a possible way for dealing with the fitting problem, based on the GreenLab model approach. Detailed organ-level data including topological and geometrical measurements were collected on eight Chinese Pine (Pinus tabulaeformis Carr.) saplings grown near Beijing. Adaptation of GreenLab to introduce a flexible modeling for biomass allocation to ring growth is presented. The main assumptions, such as allometry rules and sink relationships, were investigated. The problem of calibration of a complex branching structure was solved by defining an average tree. The results were interpreted with particular focus on the ones concerning the hidden mechanisms of secondary growth.

Mots-clés : pinus; croissance; modèle mathématique; modèle de simulation; physiologie végétale; organogénèse; biomasse; pinus tabulaeformis; sink effect

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