Department of Biology, San Diego State University, 92182, San Diego, California, USA.
Planta. 1975 Jan;125(3):281-7. doi: 10.1007/BF00385604.
Thermal conductivities of fresh leaves, both unmodified and infiltrated with water, were measured. Samples were placed between silver plates of known and differing temperatures, and the time required to boil off a constant volume of liquid was measured. The species used are evergreens: Eucalyptus globulus Labill. (sclerophyllous) with isolateral leaf symmetry; and Peperomia obtusifolia A. Dietr. (succulent), Citrus limon Burm. f. (mesophyllous), Arbutus menziessii Pursh. (sclerophyllous), and Heteromeles arbutifolia M. Roem. (sclerophyllous), all with bilateral leaf symmetry. Mean values found were in the range of 0.268 to 0.573 W/m · °C for fresh leaves, and 0.540 to 0.548 W/m · °C for leaves infiltrated with water. An analysis of errors in the technique indicated that these values may be somewhat low. These results are several times higher than previously reported values. It is concluded that ordinary mesophytic and xerophytic leaves will not develop large gradients in temperature between the surfaces.
测量了新鲜叶片（未经处理和浸润水）的热导率。将样品放置在已知且温差不同的银片之间，测量沸腾一定体积液体所需的时间。所用的物种为常绿植物：桉树 globulus Labill.（硬叶），具有等侧叶对称；Peperomia obtusifolia A. Dietr.（肉质），Citrus limon Burm. f.（叶肉），Arbutus menziessii Pursh.（硬叶）和 Heteromeles arbutifolia M. Roem.（硬叶），均具有双侧叶对称。发现新鲜叶片的平均值在 0.268 到 0.573 W/m·°C 之间，浸润水的叶片在 0.540 到 0.548 W/m·°C 之间。对技术误差的分析表明，这些值可能略低。这些结果比以前报道的值高出数倍。因此得出结论，普通的中生和旱生叶不会在表面之间形成大的温度梯度。
