Adaptation of the GreenLab model for analyzing sink-source relationships in Chinese Pine saplings

Hong Guo (1) , Veronique Letort (2, 3) , Lingxia Hong (1) , Thierry Fourcaud (4) , Paul-Henry Cournède (2, 3) , Yuanchang Lu (1) , Philippe de Reffye (3, 4)

1 Research Institute of Forest Resource Information Techniques
2 MAS - Mathématiques Appliquées aux Systèmes - EA 4037
3 DIGIPLANTE - Modélisation de la croissance et de l'architecture des plantes
4 UMR AMAP - Botanique et Modélisation de l'Architecture des Plantes et des Végétations

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 saplings (Pinus tabulaeformis carr.) 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 tabulaeformis; Topolog; Functional-structural model

Domaines: Systèmes dynamiques [math.DS]; Biologie végétale

Hong Guo, Veronique Letort, Lingxia Hong, Thierry Fourcaud, Paul-Henry Cournède, et al.. Adaptation of the GreenLab model for analyzing sink-source relationships in Chinese Pine saplings. PMA06, Plant growth modeling, Simulation, Visualization and Applications, Nov 2006, Beijing, China. pp.236-243. ⟨hal-00576583⟩