Leaf water use in heterobaric and homobaric leafed canopy tree species in a Malaysian tropical rain forest
Leaf water use in heterobaric and homobaric leafed canopy tree species in a Malaysian tropical rain forest
复制标题
DOI：
10.1007/s11099-015-0105-6
复制
发表时间：
2015-03
期刊：
影响因子：
2.7
通讯作者：
Y. Inoue;Y. Inoue;T. Kenzo;Ayumi Tanaka‐Oda;Aogu Yoneyama;T. Ichie
中科院分区：
文献类型：
--
作者：
Y. Inoue;Y. Inoue;T. Kenzo;Ayumi Tanaka‐Oda;Aogu Yoneyama;T. Ichie
热带乔木树种按其异生叶和同生叶可分为两类。对热带雨林23种冠层树种的叶片和木质部形态特征及其与水分利用的关系进行了研究。异压叶种的最大光合作用和蒸腾速率显著高于同压叶种，叶水势的日变化也大于同压叶种。异生叶的导管直径显着大于同生叶，气孔指数(SPI)显著高于同生叶。两种叶片的导管直径、SPI和最大蒸腾速率之间均呈显著正相关。而在水分利用效率、单位面积叶质量、叶片含氮量、叶片δ13C等方面，异生叶和同压叶种间差异不显著。结果表明，异生叶和同生叶的叶片和木质部形态差异与叶片水分利用特性密切相关，即使在同一生境中也是如此：异生叶在强光条件下利用大量水分获得高碳增益，而同生叶由于冠层环境水分利用少，即使在中午也能保持较高的叶水势。
Tropical canopy tree species can be classified into two types by their heterobaric and homobaric leaves. We studied the relation between both leaf types and their water use, together with the morphological characteristics of leaves and xylem, in 23 canopy species in a tropical rain forest. The maximum rates of photosynthesis and transpiration were significantly higher in heterobaric leaf species, which also underwent larger diurnal variations of leaf water potential compared to homobaric leaf species. The vessel diameter was significantly larger and the stomatal pore index (SPI) was significantly higher in heterobaric than that in homobaric leaf species. There was a significant positive correlation between the vessel diameter, SPI, and maximum transpiration rates in all the studied species of both leaf types. However, there was no significant difference in other properties, such as leaf water-use efficiency, leaf mass per area, leaf nitrogen content, and leaf δ13C between heterobaric and homobaric leaf species. Our results indicate that leaf and xylem morphological differences between heterobaric and homobaric leaf species are closely related to leaf water-use characteristics, even in the same habitat: heterobaric leaf species achieved a high carbon gain with large water use under strong light conditions, whereas homobaric leaf species can maintain a high leaf water potential even at midday as a result of low water use in the canopy environment.