Guangdong Provincial Key Laboratory of Applied Botany, Key Laboratory of National Forestry and Grassland Administration on Plant Conservation and Utilization in Southern China, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China.
Jiangxi Provincial Key Laboratory of Carbon Neutrality and Ecosystem Carbon Sink, Lushan Botanical Garden, Chinese Academy of Sciences, Jiujiang, 332900, China.
New Phytol. 2024 Dec;244(6):2267-2277. doi: 10.1111/nph.20213. Epub 2024 Oct 18.
In theory, there is a trade-off between hydraulic efficiency and safety. However, the strength and direction of this trade-off at the leaf level are not consistent across studies, and habitat climate may impact this trade-off. We compiled a leaf hydraulic efficiency and safety dataset for 362 species from 81 sites world-wide, with 280 paired observations of both traits, and tested whether climate was associated with departure from the proposed trade-off. The leaf hydraulic efficiency-safety trade-off was weak (R = 0.144) at the global scale. Mean annual precipitation and solar radiation (SR) modified the trade-off. Species from dry and high SR habitats (e.g. desert and tropical savanna) were generally located above the trade-off line, indicating that these species tended to have higher leaf hydraulic safety and efficiency than species from wet habitats with low SR (e.g. subtropical monsoon forest and montane rainforest), which were located below the trade-off line. Leaves with high vein density, dry leaf mass per area, and osmotic regulation enhanced safety without compromising hydraulic efficiency. Variation in the hydraulic efficiency-safety trade-off at the leaf level likely facilitates plant survival in specific habitats and allows for a more nuanced view of leaf hydraulic adaption strategies at the global scale.
从理论上讲，水力效率和安全性之间存在权衡。然而，在叶片水平上，这种权衡的强度和方向在不同的研究中并不一致，生境气候可能会影响这种权衡。我们为全球 81 个地点的 362 种植物编译了叶片水力效率和安全性数据集，其中 280 对观测到这两个特征，我们检验了气候是否与偏离拟议的权衡有关。叶片水力效率-安全性权衡在全球范围内较弱（R=0.144）。年平均降水量和太阳辐射（SR）改变了权衡。来自干旱和高 SR 生境（如沙漠和热带稀树草原）的物种通常位于权衡线之上，这表明这些物种的叶片水力安全性和效率通常高于来自低 SR 湿润生境（如亚热带季风林和山地雨林）的物种，后者位于权衡线之下。叶脉密度高、单位叶面积干重和渗透调节增强了安全性，而不会降低水力效率。叶片水力效率-安全性权衡的变化可能有助于植物在特定生境中的生存，并允许在全球范围内更细致地了解叶片水力适应策略。
