ORYZA2000模型与水稻群体茎蘖动态模型的耦合

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

以水稻群体茎蘖动态模拟为例,采用单向耦合方法,将ORYZA2000模型模拟的逐日发育进程和生物量作为水稻群体茎蘖动态模型的输入,驱动茎蘖动态模型模拟,尝试将水稻群体茎蘖动态模型引入ORYZA2000模型中,作为该模型的子模块以扩展ORYZA2000模型对茎蘖动态、籽粒灌浆动态和叶龄动态等水稻生长要素模拟的功能。为检验耦合模型(ORY-TIL),选用2012年杂交籼稻两优培九和扬稻6号5个播期的大田观测数据,在两模型参数定标的基础上,模拟2个播期水稻群体茎蘖动态,并对模拟结果进行误差分析。结果显示,ORY-TIL模型能较好模拟水稻发育速率、地上部总生物量和群体茎蘖动态,各项模拟值与实测值的相关系数均达0.95以上,且通过0.01水平显著性检验;扬稻6号和两优培九群体茎蘖密度模拟值与实测值的均方根误差分别为24.3条·m^(-2)和34.9条·m^(-2),误差主要出现在茎蘖消亡阶段。总体来看,ORY-TIL模型具有较好模拟性能,提出的耦合方法对扩展水稻生长模型具有一定参考价值。

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^（-2） and 34.9till·m^（-2） for 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.