关键词: 蒲公英, 物候特征, 气候变暖

Abstract: he phenological changes of dandelion in Jilin Province under the background of climate warming were analyzed by the statistics method. The relationships between phenological characteristics of dandelion and air temperature in spring or autumn were discussed. The results indicate that air temperature in spring and autumn is an obvious increase trend since 1980 in Jilin province, especially in autumn. The leave unfolding phase is delayed and the leave coloring phase is advanced, and the growth period is shortened in the west region of Jilin province. The phenological changes are not obvious in the central region of Jilin province. The leave unfolding phase is advanced and the leave coloring phase is delayed, and the growth period is prolonged in the east region of Jilin Province. The changes of air temperature and phenology are of obviously regional characteristics. The change trends of the leave unfolding phase and spring air temperature are identical in same region. The change trends of the leave coloring phase and autumn air temperature are consistent in the humid east region of Jilin province, while those are contrary in the dry west region of Jilin province. The reasons of phenological phase changes in the west and east regions are discussed, and air temperature model of phenological phase in each station is established by linear regression method.