Abstract: Based on the data of daily average temperature, rice development date, yield and historical disasters from 10 agrometeorological observation stations in Jilin province from 1981 to 2019, two types of chilling injury events of delayed and sterile-type chilling injury in key growth period of rice were identified. The disaster intensity and spatial-temporal changes of different types of chilling injury in key growth period were analyzed. The results showed that: (1) under the background of global warming, there was a significant change trend in the rice development period of each station in Jilin province, in which the transplanting date was mainly in advance and the maturity date was mainly delayed. The climate tendency rate of 80% of the stations interval days during the transplanting maturity period were positive, and the increasing trend of half of the stations passed the significance test at the level of 0.05. (2) The frequency of delayed chilling injury decreased significantly in different years, which was mainly related to the improvement of temperature conditions at transplanting heading period; The disaster intensity of delayed chilling injury at transplanting heading period was greater. (3) The frequency of sterile-type chilling injury in flowering period was significantly higher than that in booting period, but the disaster intensity of sterile-type chilling injury in booting period was greater. (4) In terms of spatial distribution, the occurrence frequency of delayed chilling injury in the whole region was not different, and only the severe delayed chilling injury was slightly higher in the eastern region; The occurrence frequency of sterile-type chilling injury in the eastern region of Jilin province is significantly more serious than that in other regions. In conclusion, under the joint action of global warming, farmers' adjustment of rice transplanting date and variety change, the occurrence of delayed chilling injury in key growth period of rice is significantly reduced, and sterile-type chilling injury mainly occurred in the east of Jilin province.

Key words: Delayed chilling injury, Sterile-type chilling injury, Rice, Growing periods