1962—2007年北京地区木本植物秋季物候动态

根据中国物候观测网络北京观测站点的物候资料及气候资料，分析了1962—2007年北京地区20种主要木本植物秋季物候对气候变化的响应情况.结果表明：1962—2007年间，北京地区秋季物候开始日期基本保持不变，但结束日期有所推迟，推迟的幅度为3.2 d·10 a^-1，导致该区秋季延长了约14 d；研究期间，北京地区木本植物秋季叶始变色期均表现为推迟趋势，平均推迟幅度为4.9 d·10 a^-1；平均最低气温是影响北京地区木本植物叶始变色期早晚的主要气候因子.气候增暖可能是导致近40年北京地区木本植物秋季物候期推迟的主要原因.

Dynamics of autumn phenophase of woody plants in Beijing region in 1962-2007.

The responses of the autumn phenophase of 20 woody plants to climate warming in Beijing in 1962-2007 were analyzed by using the plant phenological data and the meteorological data obtained from Chinese Phenology Observation Network of Chinese Academy of Sciences. The results showed that in Beijing region, the end date of autumn defined by phenology was extended remarkably at an average rate of 3.2 d·10 a^-1, while the onset of autumn defined by phenology remained essentially unchanged, resulting in a 14 d prolongation in autumn in 1962-2007. The timing of first leaf coloring change for the woody plants showed an average delaying rate of 4.9 d·10 a^-1, and the main affecting factor was the mean minimum temperature. Climate warming was probably the main reason for the delaying trend in autumn phenophase of woody plants in Beijing during the study period.