关键词: 芽开放, 叶变色, 物候

Abstract: Based on phonological and meteorological data from 24 phenology observation stations in Inner Mongolia in last 30 years,the phonological characters and trends of average spring sprout and autumn leaf fading of Populus simonii Carr were analyzed The results showed that spring sprout of  Populus simonii Carr was advanced with the rate of 1.4d/10y in last 30 years.The highest advanced phase of percentage ratio of annual was in 1990s,followed by 2000-2008.The date of Leaf fading postponed with the rate of 3.0 d/10y.The highest postponed phase of percentage ratio of annual was in 2000-2008.The spring sprout of Populus simonii Carr was significant negative correlation with the spring temperature (P<0.05),and the autumn leaf fading was significance positive correlation with autumn temperature (P<0.05),which indicated that the sprout advanced more with the spring temperature increasing,the leaf fading postponed more with autumn temperature increasing.

Key words: Sprout, Leaf fading, Phenology