华北等低纬度地区自然分布的园林树种,如国槐、白蜡、垂柳等,引入到沈阳地区栽植已经有十几年乃至上百年的历史。但是,这些低纬度树种在高纬度地区栽植后,特殊年份经常发生春季大量死亡的现象。通过光合速率测定、树干径流测定和气象因子的分析,结果表明,这些树种大量死亡的原因是树种的生理特征与气候因子的综合作用所致。 North China and other low latitudes natural distribution of species of trees, such as Sophora japonica, ash, weeping willow, introduced to the Shenyang area planting has more than ten years or even centuries of history. However, after the planting of these low-latitude species in high latitudes, a large number of spring deaths frequently occur in special years. The results of photosynthetic rate determination, trunk runoff measurement and meteorological factor analysis showed that the reason for the large number of deaths of these species was the combination of physiological characteristics of tree species and climatic factors.