Insights into the differences in leaf functional traits of heterophyllous Syringa oblata under different light intensities
Insights into the differences in leaf functional traits of heterophyllous Syringa oblata under different light intensities
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不同光强下异叶丁香叶片功能性状的差异研究
DOI：
10.1007/s11676-015-0100-6
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发表时间：
2015-09-01
影响因子：
3
通讯作者：
Du, Daolin
中科院分区：
文献类型：
--
作者：
Xiao, Hongguang;Wang, Congyan;Du, Daolin
许多植物具有异叶性；叶片形态在时空上的显著差异可能对其在不同生境下的成功起着适应作用。因此，本研究旨在了解异叶丁香叶片功能性状的差异。在中国东部不同光照强度下作为观赏树种在世界范围内得到广泛应用。披针形叶和心形叶的比叶面积（SLA）无显著差异。披针形和心形叶片单位光捕获表面积的投资差异可能不明显。这可能是由于心形叶片的单叶湿重和干重显著高于披针形叶片，而叶片长度和叶片厚度显著低于披针形叶片。遮荫树的SLA显著高于日光树。遮荫树单位捕光面投资低于日光树，可提高低光环境下的捕光利用效率。遮荫树叶片厚度和水分的表型可塑性范围越大，有利于在强光环境下更有效地控制水分流失和养分剥夺，单叶干湿重的表型可塑性范围越小，遮荫树SLA有利于在弱光环境下提高资源（尤其是光）的捕获和利用效率。简而言之，植物成功的生态策略就是在多元环境中找到各种功能性状之间权衡的最优模式，以获得更多的生物资源，尽可能地获得更多的适应度优势。
Many plants exhibit heterophylly; the spatially and temporally remarkable ontogenetic differences in leaf morphology may play an adaptative role in their success under diverse habitats. Thus, this study aimed to gain insights into differences in leaf functional traits of heterophyllous Syringa oblata Lindl., which has been widely used as an ornamental tree around the world under different light intensities in East China. No significant differences existed in specific leaf area (SLA) between lanceolate- and heart-shaped leaves. Differences in the investment per unit of light capture surface area deployed between lanceolate- and heart-shaped leaves may be not obvious. This may be attributing to the fact that single leaf wet and dry weight of heart-shaped leaves were significantly higher than those of lanceolate leaves but leaf length and leaf thickness of heart-shaped leaves were significantly lower than those of lanceolate leaves. The SLA of shade trees was significantly higher than that of sun trees. The investment per unit of light capture surface of shade trees was lower than that of sun trees, making it possible to increase light capture and use efficiency in low-light environments. The higher range of phenotypic plasticity of leaf thickness and leaf moisture for sun trees may be beneficial to obtain a more efficient control of water loss and nutrient deprivation in high-light environments, and the lower range of phenotypic plasticity of single leaf wet and dry weight, and SLA for shade trees may gain an advantage to increase resource (especially light) capture and use efficiency in low-light environments. In brief, the successfully ecological strategy of plants is to find an optimal mode for the trade-off between various functional traits to obtain more living resources and achieve more fitness advantage as much as possible in the multivariate environment.