Abstract: Based on four popular light response models of photosynthesis, i.e., the rectangular and non rectangular hyperbola models, exponential model and modified rectangular hyperbola model, we derived four comprehensive photosynthesis models for winter wheat including the impact of temperature and CO2concentration. Two independent experimental datasets were respectively used for parameter optimization and model validation. The results showed that the modified rectangular hyperbola model gave the best prediction in the four models, with the correlation coefficient (r) and root mean squared error (RMSE) between predicted and observed net photosynthetic rate being 0.925 and 1.666μmol·m-2·s-1, respectively. Due to inclusion of photoinhibition, the modified rectangular hyperbola model performed well under high light, therefore was most suitable for winter wheat in the lower Yangtze river. The results of this study were expected to provide references for model selection and application in winter wheat growth simulation and yield prediction. 

Key words:  Winter wheat, Photosynthesis model, Lower Yangtze river, Light response, CO2 , concentration, Temperature, Applicability