南京地区12种常绿阔叶树种冬季抗寒性动态变化

选取南京地区露地引种的12种常绿阔叶树种,借助电导法对其抗寒性进行研究,结果表明:12种常绿树种在2003年与2005年冬季期间,抗寒能力高低排序具有很好的一致性与重复性.12种常绿树种在2005年10月至2006年3月期间随冬季低温诱导进行其抗寒能力呈逐渐增强趋势,其中在1月中旬树种抗寒能力均达到最强,而通常在10月份或3月份期间树种抗寒能力最弱.比较而言,12种常绿阔叶树种对冬季低温条件响应的快慢程度各有差异,其中樟科的香樟(Cinnamomum camphora)、浙江樟(Cinnamomum japonicum)属于低温快速响应型,而冬青科的冬青(Ilex purpurea)、大叶冬青(Ilex latifolia)属于低温滞缓响应型,其余树种为正常响应型.12种常绿阔叶树种试验所得抗寒能力结果与引种地冬季观察结果具有很好的对应性.研究结果可为常绿阔叶树种进一步向较高纬度地区的引种与栽培管理工作提供重要的参考.

Dynamic changes of cold hardiness in winter in twelve evergreen broad-leaved species from Nanjing

Cold hardiness of twelve evergreen broad-leaved species that introduced to the open field of Nanjing was evaluated by means of electric conductivity. The results found that the order of cold hardiness in those species is consistent and repeated during the winter from 2003 to 2005. Cold hardiness in these species was increased with a period of low temperature induction in winter from October, 2005 to March, 2006. The highest value was observed in the middle of January, with lowest observed on October or March as usual. The responding speed to the low temperature in winter in these species varies. While Cinnamomum camphora and Cinnamomum japonicum respond fast to low temperature, Ilex purpurea and Ilex latifolia respond slowly. The rest respond normally. The cold hardiness revealed in this study is well agreed with the observation of winter in Nanjing. Therefore, the results obtained may be used as important reference in introducing evergreen broad-leaved species into higher latitude regions.