A FUNCTIONAL-STRUCTURAL MODEL GREENLAB FOR PINUS TABULAEFORMIS

doi:10.3773/j.issn.1005-264x.2009.05.014

Abstract

Abstract:

Aims Functional-structural plant modeling is concerned with the integration of architecture and resource allocation as aspects of plant function. It can depict the three-dimensional presentation of plants for use in analyzing individual tree growth and interactions between structural architecture and resource allocation in environments. Our objective was to parameterize and validate the functional-structural model GreenLab for young Pinus tabulaeformis to simulate its growth. Few studies have applied the GreenLab model to trees.
Methods Destructive sampling was done to collect detailed data including structure and biomass measurements from 9 young P. tabulaeformis trees. We used the functional-structural GreenLab model that has been successfully calibrated for several crops. To extend its application in tree growth analysis, we validated the basic hypotheses of the model such as constant allometry rules and source-sink relationships. Direct parameters were attained from the measurement data and hidden parameters of the model were calibrated using the generalized least squares method.
Important findings Simulations of P. tabulaeformis growth based on the fitted parameters were reasonably accurate. The coefficients of determination of linear regression equations between observations and predictions ranged from 0.78 to 0.91. The topological code system was set up to analyze tree topological structure for simulation. The calibrated parameters can be used to simulate and visualize 3D representation of pine trees. The methods for measuring tree topology and biomass and coding system can serve as a reference for the development of functional-structural models of coniferous trees.

Key words: tree functional-structural model, biomass production and allocation, topological structure, source-sink relationship, Pinus tabulaeformis

GUO Hong, LEI Xiang-Dong, Veronique Letort, LU Yuan-Chang, Philippe de Reffye. A FUNCTIONAL-STRUCTURAL MODEL GREENLAB FOR PINUS TABULAEFORMIS[J]. Chin J Plant Ecol, 2009, 33(5): 950-957.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2009.05.014

https://www.plant-ecology.com/EN/Y2009/V33/I5/950

Figures/Tables 7

Fig. 1 Topological structure for 5-year-old Pinus tabulaeformis

Fig. 2 Topological code system

Table 1 Parameters for Pinus tabulaeformis saplings

参数 Parameter	PA 1	PA 2	PA 3	PA 4
P_e	0.65	0.25	0.08	0.03
P_a	1.00	0.95	0.18	0.10
T	3 a
SLW	0.08 g·cm^-2
b_e	47.75	134.33	270.93	190.71
β	-0.06	0.06	-0.12	0.50
Sp	0.13 m²
r	0.48

Fig. 3 The ratio of internode fresh mass to needles fresh mass

Fig. 4 Internode allometry

Fig. 5 Model calibration

Fig. 6 3D visualization for Pinus tabulaeformis saplings (1a, 3a, and 5a)

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