中文摘要：

选取树龄相同的3种散孔材（杨树、梧桐和樱花）和3种环孔材（刺槐、合欢和白蜡）树种,用3种不同方法（解剖法、加压法和水容法）研究了其叶水力导度的差异及与抗旱性（PV曲线参数）的关系.结果显示：解剖法估算的最大叶水力导度高于加压法和水容法,加压法和水容法在6个树种中的5个上测定值完全一致,3种散孔材与环孔材树种的叶最大水力导度无显著差异.3种散孔材树种的饱和渗透势和膨压损失点渗透势与3种环孔材相比差异不大,但膨压损失点的相对含水量则低于环孔材树种,质外体含水量高于环孔材树种,导致其综合抗旱性指数也高于3种环孔材树种.研究表明,散孔材和环孔材树种的叶最大水力导度与其抗旱性之间并无显著相关关系.

英文摘要：

Leaf maximum hydraulic conductance（measured with three methods：anatomic,pressuring and capacitance method） and its relationship with drought resistance（PV curves） were studied in three diffuse-porous species（Populus tomentosa,Platanus hispanica,Prunus lannesiana） and three ring-porous species（Robinia pseudoacacia,Albizzia julibrissin,Fraxinus chinensis）.The results indicated that leaf maximum hydraulic conductance measured by anatomic method was higher than those by pressuring method and capacitance method.The pressuring method was consistent with capacitance method in five of six species.No difference in leaf hydraulic conductance had been detected between three diffuse-porous and three ring-porous species,so did the saturated osmotic potential and osmotic potential at turgid loss point.Three diffuse-porous species had lower relative water content at turgid loss point,and higher apoplastic water content and comprehensive drought resistance index than that of three ring-porous species.There was no correlation between leaf maximum hydraulic conductance and drought resistance in six species.