气候变化对我国刺槐、紫丁香始花期的影响

该文探讨了1963—1988年间北京地区刺槐、紫丁香始花期对气温、日照及降水变化的响应以及我国不同地区这两种树木始花期与不同时段气温变化之间的相关关系.结果显示,临近始花期,气温对始花期早晚的影响最显著,日照次之,降水量最弱.气温升高、日照时数增加,始花期提前;而降水量增加,始花期推迟.气温对始花期产生影响的时段主要集中在春季及冬末,影响最显著的时段是始花前2～8旬,即从2月上旬到始花日期之间的时段.春季气温越高,始花期越早,而上年夏、秋、冬季的气温对始花期没有显著性影响.不同地区,春季平均气温、最高气温及最低气温对始花期均有影响,一般而言,最高气温的影响最强,而最低气温的影响最弱,这3种气温的升高使始花期均有提前的效应.

Impacts of climate change on first-flowering dates of Robinica pseudoacacia L.And Syringa amurensis Rupr.In China

The impacts of air temperature, precipitation and sunshine on first flowering dates of Robinica pseudoacacia L. and Syringa amurensis Rupr. and the correlation between first flowering dates and air temperature in different periods of 1963 1988 were analyzed in this study. Results show that first flowering dates are most significantly correlated with air temperature, less with sunshine hours and the least with precipitation in Beijing. An increase in air temperature and sunshine hours leads to an advance of first flowering dates while an increase in precipitation makes them delay. The air temperature in spring and late winter mainly influences first flowering dates, and the most significant influencing period is 20 80 days before flowering in China.abstract: That is, for Robinica pseudoacacia L. and Syringa amurensis Rupr., the most correlated period is from the first ten days of February to their first flowering dates respectively. Higher air temperature in spring causes earlier first flowering dates, but air temperature in summer, autumn and winter of last year has no significant impact. In general, the maximum air temperature has the most significant impact on the first flowering dates while the minimum air temperature has the least, and an increase in average, maximum and minimum air temperature is responsible for the advance of first flowering dates.