中国东部季风气候区木本植物展叶期对春季温度变化的敏感性

选取中国东部不同地区垂柳(Salixbabylonica L.)、木槿(Hibiscus syriacus L.)、刺槐(Robinica pseudoacacia L.)、梧桐(Firmiana platanifolia(Linn.f.)Marsili)4种植物的展叶期物候观测资料(1963-1988年),采用线性回归方法,分析4种植物对春季温度的敏感性和敏感时段。结果表明,4种木本植物的展叶期自北向南逐渐提前,年际波动逐渐增加;展叶期对温度的显著敏感时段集中在2-4月,南方地区的敏感时段(40~60d)长于北方(10~40d);展叶期与春季时段的温度呈显著负相关关系,其敏感性为南方(3.3~9.0d/℃)大于北方(1.6~5.6d/℃)。植物展叶期对气候变化的敏感性对不同植物、不同地区表现出一定的差异。

Sensitivity of Leaf Unfolding Date for Woody Plant to Temperature Variability in Spring in China's Eastern Monsoonal Region

The sensitivity and sensitive periods of leaf unfolding dates of woody plant to climate change in China＇s eastern monsoonal region were analyzed.Four tree species（Salix babylonica L.,Hibiscus syriacus L.,Robinica pseudoacacia L.,Firmiana platanifolia（Linn.f.） Marsili） in China＇s different sites for variation of leaf unfolding dates in response to variability of temperature in spring were investigated.Phenological and meteorological data from 1963 to 1988 were examined using unitary correlation.The results showed that leaf unfolding dates became significantly earlier and the interannual variation increased with the latitude.The periods during February and April were the significant sensitive periods of leaf unfolding dates to temperature in spring,which were shorter in the north area（10-40 days） and longer in the south area（40-60 days）.The correlations between leaf unfolding dates and spring temperature were significantly negative.The sensitivities of leaf unfolding dates to temperature in the south area（3.3-9.0 days/℃） were higher than that in the north area（1.6-5.6 days/℃）.The sensitivities of leaf unfolding dates to climate change were different for specific species and different regions.