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首页> 外文期刊>Tree Physiology >Hydraulic traits are associated with the distribution range of two closely related Mediterranean firs, Abies alba Mill. and Abies pinsapo Boiss.
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Hydraulic traits are associated with the distribution range of two closely related Mediterranean firs, Abies alba Mill. and Abies pinsapo Boiss.

机译：水力性状与两个密切相关的地中海冷杉 albies Mill的分布范围有关。和 Abies pinapo Boiss。

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摘要

Abies alba and Abies pinsapo are two closely related fir species that occur in the Iberian Peninsula under very different environmental conditions. Abies alba proliferates in the humid European mountains, including the Spanish Pyrenees. In contrast, A. pinsapo is a relict species that occurs in some restricted areas of the Mediterranean mountain ranges in Spain and Morocco, which experience intense summer drought periods. To cope with the high atmospheric evaporative demand during summer, A. pinsapo may either have a high resistance to xylem cavitation or develop a very efficient conducting system to reduce the soil-to-leaf water potential gradient. To investigate such hypotheses, we measured (i) the xylem vulnerability to cavitation for different populations, and (ii) several anatomical and hydraulic parameters indicating xylem sufficiency for - supplying water to the shoot in two contrasting populations of both species. Our results show that the resistance to cavitation was not different between species or populations. However, hydraulic conductivity (Kh), specific hydraulic conductivity (Ks), leaf-specific conductivity (LSC) and whole-shoot hydraulic conductance (Kshoot) were higher in A. pinsapo, indicating a higher efficiency of water transport, which should contribute to maintaining its xylem tension below the threshold for rapidly increasing cavitation. The higher Ks in A. pinsapo was largely a result of its wider tracheids, suggesting that this species may be much more vulnerable to freeze-thaw-induced cavitation than A. alba. This is consistent with the absence of A. pinsapo in northern mountain ranges with cooler winters. These physiological differences could partly explain the niche segregation and the geographical separation of these two firs.
机译：白冷杉和松树是两个密切相关的冷杉物种，它们在伊比利亚半岛的环境条件不同。 白冷杉在潮湿的欧洲山脉中繁衍，包括西班牙比利牛斯山脉。相反， A。 Pinapo 是一种遗迹物种，发生在西班牙和摩洛哥的地中海山脉某些禁区，夏季遭受干旱。为了应付夏季较高的大气蒸发需求， A。 pinapo 可能对木质部的空化具有很高的抵抗力，或者可能开发出一种非常有效的导电系统来降低土壤与叶之间的水势梯度。为了研究这样的假设，我们测量了（i）不同种群木质部对空化的脆弱性，以及（ii）指示木质部充足的几个解剖学和水力学参数-在两个物种的两个相反种群中为枝条供水。我们的结果表明，对空化的抵抗力在物种或种群之间没有差异。但是，水力传导率（ K h ），比水力传导率（ K s ），叶比传导率（ LSC）和全幅水力传导率（ K shoot ）在 A中较高。 pinapo ，表明水的运输效率更高，这应有助于使其木质部张力保持在快速增加空化的阈值以下。 A中较高的 K s 。 Pinapo 主要是其气管更宽的结果，表明该物种比 A更容易受到冻融诱导的空化作用。阿尔巴。这与 A的缺失是一致的。北部山区的pinapo 冬季较凉。这些生理差异可以部分解释这两个冷杉的生态位分离和地理分离。

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