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Foliar resistance to simulated extreme temperature events in contrasting plant functional and chorological types

机译：不同植物功能和植物学类型对模拟极端温度事件的耐叶性

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We analysed leaf resistance of 41 Angiosperms belonging to a wide range of plant functional (PFTs) and chorological types (PCTs) to simulated frost and high-temperature extreme events (EE). Leaf resistance was estimated as percentage of membrane electrolyte leakage under heating and freezing treatments in the lab. Leaf resistance to heating or freezing was not significantly correlated with the main resource-use characteristics that defined PFTs, such as leaf specific area, toughness, N concentration or thickness. Leaf resistance to heating differed among PFTs (graminoids and bromeliads were the more resistant groups), but not among PCTs. In contrast, leaf resistance to freezing significantly differed among PCTs. Along a steep regional climatic gradient, climate variables (annual mean temperature, mean minimum temperature, mean maximum temperature and number of frost-free months) at the locations where the given species were most abundant were also significantly correlated with freezing resistance. Species from colder habitats both at the sub-continental and regional scales showed the highest leaf resistance to freezing. Our work indicates that leaf resistance to climatic EE and resource-use strategy (assessed in previous studies) represent two different, partially decoupled axes of plant specialisation. It also suggests that changes in the frequency of very low temperature events might have regional-scale impacts on vegetation, whereas changes in the frequency of very high temperature events might have more influence at the local scale. [References: 46]
机译：我们分析了41种被子植物的叶片抗性，这些被子植物具有广泛的植物功能性（PFT）和植物学类型（PCTs），可以模拟霜冻和高温极端事件（EE）。在实验室中，在加热和冷冻处理下，叶片抗性估计为膜电解质泄漏的百分比。叶片对加热或冷冻的抵抗力与定义PFT的主要资源利用特征（例如叶片比表面积，韧性，氮浓度或厚度）没有显着相关。在PFT中，叶片对加热的抗性有所不同（类胡萝卜素和凤梨科是最强的抗性基团），而在PCT中则没有。相反，PCT之间的叶片抗冻性差异显着。沿着陡峭的区域气候梯度，给定物种最丰富的位置处的气候变量（年平均温度，平均最低温度，平均最高温度和无霜月份数）也与抗冻性显着相关。来自次大陆和区域尺度的较冷栖息地的物种显示出最高的叶片抗冻性。我们的工作表明，叶片对气候EE的抵抗力和资源利用策略（在先前的研究中进行了评估）代表了植物专业化的两个不同的，部分解耦的轴。这也表明，极低温事件发生频率的变化可能会对植被产生区域性影响，而极高温事件发生频率的变化可能会对局部尺度产生更大的影响。 [参考：46]

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