Source-sink relationships vary with age in Chinese Pine (Pinus Tabulaeformis Carr.): analysis using the GreenLab model

Guo Hong, Lu Yuanchang, Diao Jun, Letort Véronique, De Reffye Philippe. 2012. Source-sink relationships vary with age in Chinese Pine (Pinus Tabulaeformis Carr.): analysis using the GreenLab model. In : Plant growth modeling, simulation, visualization and applications. Proceedings PMA12 : The Fourth International Symposium on Plant Growth Modeling, Simulation, Visualization and Applications, Shanghai, China, 31 October-3 November 2012. Kang Meng Zhen (ed.), Dumont Yves (ed.), Guo Yan (ed.). Piscataway : IEEE, 148-151. ISBN 978-1-4673-0068-1 International Symposium on Plant Growth Modeling, Simulation, Visualization and Applications (PMA12). 4, Shanghai, Chine, 31 Octobre 2012/3 Novembre 2012.

Résumé : Tree growth and development rely on the underlying dynamics of their source-sink balance. Given the difficulty of collecting experimental data on adult frees, models can be used as tools to disentangle the complex processes that drive biomass production and allocation. This paper investigates the variations of parameters with age driving the source-sink balance of individual trees through the functional-structural plant model GreenLab. Six Chinese pine (Pinus tabulaeformis Carr.) trees were destructively sampled and were divided into three groups based on ages: 5-year old, 10-year old and 18-year old. Firstly, the effects of age on organ dimensions and on organ relative mass were analyzed based on direct experimental measurement. Secondly, the hidden parameters of the GreenLab model were estimated using the data of total tree biomass for needle and wood compartment independently and then for the six trees in parallel. The statistical tests showed that there were significant differences between the tip attributes on first-, second-, and third-order branches of the three age stages for internode diameter, intemode sink and needle sink. Preliminary fitting results showed that the sink of layers and the parameter of biomass production efficiency 1/r decrease with age.

Classification Agris : U10 - Informatique, mathématiques et statistiques
F62 - Physiologie végétale - Croissance et développement
K10 - Production forestière

Auteurs et affiliations

• Guo Hong, Chinese Academy of Forestry (CHN)
• Lu Yuanchang, Chinese Academy of Forestry (CHN)
• Diao Jun, Chinese Academy of Forestry (CHN)
• Letort Véronique, Ecole centrale Paris (FRA)
• De Reffye Philippe, CIRAD-BIOS-UMR AMAP (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/566329/)

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