Lo Gullo M A, Salleo S
Istituto di Botanica, Università di Messina, via P. Castelli 2, 98100 Messina, Italy.
New Phytol. 1988 Mar;108(3):267-276. doi: 10.1111/j.1469-8137.1988.tb04162.x.
Measurements have been made of leaf conductance to water vapour, relative water content and water potential in Olea oleaster Hoffmgg et Link, Ceratonia siliqua L. and Laurus nobilis L., three evergreen sclerophyllous trees growing in Sicily at sea level. Measurements were made hourly in May and September 1986. Although all the three species are regarded as components of a homogeneous group (sclerophylls) and they all showed a high degree of sclerophylly, the strategies they adopted to withstand drought were completely different. Olea oleaster behaved as a 'drought-tolerating' species. Drought was 'avoided' by Ceratonia siliqua by a 'water-spending' strategy and by Laurus nobilis by a 'water-saving' strategy combined with the capability of recovering even minimal water losses by dropping leaf water potential drastically. Such differences in drought resistance are discussed in terms of differences in the bulk elastic modulus of leaf cells and wood anatomy.
对生长在西西里岛海平面的三种常绿硬叶树——油橄榄（Olea oleaster Hoffmgg et Link）、角豆树（Ceratonia siliqua L.）和月桂树（Laurus nobilis L.）的叶片水汽导度、相对含水量和水势进行了测量。1986年5月和9月每小时进行一次测量。尽管这三个物种都被视为同一类群（硬叶植物）的组成部分，并且它们都表现出高度的硬叶特征，但它们抵御干旱所采用的策略却完全不同。油橄榄表现为“耐旱”物种。角豆树通过“耗水”策略“避免”干旱，月桂树则通过“节水”策略以及通过大幅降低叶片水势来恢复哪怕是极少水分损失的能力来“避免”干旱。根据叶片细胞的体积弹性模量和木材解剖结构的差异，对这种抗旱性差异进行了讨论。
