Abstract:
Spring phenophase characteristics and its relationship with the date of stable air temperature over the indicating temperature were analyzed by statistic method from 1965 to 2007 in Shijiazhuang, and the effects of climate warming on spring phenophase were also discussed. The results indicate that spring phenophase is ahead. There is a positive relation between spring phenophase and the date of air temperature over the indicating temperature. The relativity of early spring and middle spring phenophase with air temperature from February to April is significant, while that of late spring phenophase with spring air temperature is also obvious. The responses of spring phenophase to air temperature are different. The turning time of spring phenophase and the time of air temperature abrupt change are synchronous or slightly late. Abnormal late year of spring phenophase often appears before 1990s, while abnormal early year often occurs after 1990s. Phenophase abnormal early year is usually the climate abnormal warm year. Phenophase abnormal late year is not always the climate abnormal cold year, but its climate abnormal degree is usually the positive.