通过对细叶桉、杂种桉、园锥花桉、大叶桉、白桉和柳桉六种桉树蒸腾率的比较,在充足水分和应力条件下,研究了它们的水分亏缺率。其结果表明,在充足水分和应力条件两个条件下,细叶桉和杂种桉不仅蒸腾率较低,而且还有内在的组织特征,即使在应力条件下,也能保持较高水平的水合作用。可以判断,这两种树种比其它树种更能耐旱。 By comparing the transpiration rates of Eucalyptus, Eucalyptus urophylla, Eucalyptus grandis, Eucalyptus grandis, Eucalyptus grandis and Eucalyptus globulus, their water deficit rates were studied under sufficient water and stress conditions. The results show that Eucalyptus and Eucalyptus not only have lower transpiration rate but also intrinsic tissue characteristics under the conditions of adequate water and stress, and maintain a high level of water co-operation even under stress conditions use. It can be judged that both species are more drought tolerant than the other species.