Coupling the Dynamic Tillering Model to Rice Growth Model ORYZA2000 to Simulate Rice Tillering

doi:10.3969/j.issn.1000-6362.2016.04.006

Abstract

Abstract:

This paper takes the simulation of rice tillering as an example to examine the possibility of extending the functions of ORYZA2000 by coupling rice tillering models. To achieve this, the Dynamic Tillering Model was selected and then coupled with ORYZA2000 using one-way coupling method. With this method, the Dynamic Tillering Model accepts daily outputs from ORYZA2000 without any feedback from the tillering model. Here, ORY-TIL is used to represent the coupled model for easy description. In order to examine the reliability and accuracy of the ORY-TIL model, tillering observations from rice seeding experiments for two rice varieties (i.e. Liangyoupeijiu and Yangdao 6) in 2012 were used. With the data, key parameters in ORY-TIL model were first calibrated, and then the model was used to simulate the rice tillering for the second seeding and the forth seeding experiments for evaluation. The results showed that the coupled model was not only able to simulate rice development, above-ground biomass and yield, but also was able to simulate the dynamic of rice tillering with acceptable accuracy. The correlation coefficients between simulated and measured rice development, above-ground biomass and tillering were all above 0.95, significant at the 0.01 probability level, for both Yangdao 6 and Liangyoupeijiu. Meanwhile, the root mean square error for the simulated tillering were 24.3till·m^-2and 34.9till·m^-2for Yangdao 6 and Liangyoupeijiu respectively. Large discrepancy between simulate and measured rice tillering was in the decreasing phase of the tillering. In conclusion, the ORY-TIL model with one-way coupling scheme shows a good performance in the simulation of rice tillering, which can be taken as a practical reference for extension of rice growth models.

Key words: Crop model, Hybrid rice, Assimilation method, Field experiment

YANG Shen-bin, CHEN De, WANG Meng-meng, HUANG Wei, JIANG Xiao-dong. Coupling the Dynamic Tillering Model to Rice Growth Model ORYZA2000 to Simulate Rice Tillering[J]. Chinese Journal of Agrometeorology, 2016, 37(04): 422-430.

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