Abstract: Field experiments were conducted from 2011 to 2014, to investigate the relationships between temperaturelight factors and characteristics of dry matter accumulation, photosynthetic characteristics of source and sink, yield and its components of rice in a cold region. The results showed that the utilization rate of daily active and effective accumulated temperature tended to increase year by year, and solar radiation decreased year by year during the growth period. Solar radiation intensity was the highest in filling stage in 2014. The daily active accumulated temperature, daily effective accumulated temperature and its utilization rate during the whole growth period, and the daily average solar radiation intensity after heading were significantly or extremely significantly positively correlated with grain numbers per spike, setting rate, 1000grain weight, and yield. The active accumulated temperature during the whole growth period showed a quadratic function relationship with yield (R²=0.69), biomass (R²=0.49), dry weight of stem (R²=0.74), and grain/leaf ratio (R²=0.34) at the heading stage, harvest index (R²=0.63), crop growth rate (R²=0.78) and net assimilation rate (R²=0.73), while it was extremely significantly positively correlated with the leaf area index (R=0.81).

Key words: eco-geographical region, Daxing’an Mountains, GIMMS NDVI 3g, vegetation phenology