Coordinated variation in stem and leaf functional traits of temperate broadleaf tree species in the isohydric-anisohydric spectrum
Coordinated variation in stem and leaf functional traits of temperate broadleaf tree species in the isohydric-anisohydric spectrum
复制标题
等水-非等水谱中温带阔叶树种茎叶功能性状的协调变异
DOI：
10.1093/treephys/tpab028
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发表时间：
2021-03-09
期刊：
影响因子：
4
通讯作者：
Liu, Shirong
中科院分区：
文献类型：
--
作者：
Chen, Zhicheng;Zhang, Yongtao;Liu, Shirong
气孔调节是植物适应干旱的重要策略。然而，对植物功能性状复合体如何沿着从等水到异水的连续体变化的理解仍然不足。在这项研究中，我们研究了等水/异水度程度的指标——气孔关闭时的水势——以及种植在中国北方干旱石灰岩生境的 20 种温带阔叶树种的叶子和树枝的一系列功能性状。结果表明，气孔关闭时的水势与许多功能性状显着相关。在非等水端，物种具有较高的叶片碳含量和叶脉密度、较大的气孔长度、较厚的下叶表皮、较高的抗栓塞性、较高的木材密度、较大的Huber值、较大的纤维壁厚度与木质部内腔直径的比率、较大的总纤维壁面积与木质部横截面积的比例、较低的膨压损失点(TLP)水势、较小的TLP相对含水量、较低的TLP值。充分膨压和较小比叶面积时的渗透势。结论是，共同进化的解剖和生理性状之间的协调和权衡的连续体产生了20个树种从等水到非等水的谱系，并且非等水树种表现出更强的抗逆性，在干旱条件下比等水树种对茎和叶的投入更大以维持气孔开放。
Stomatal regulation serves as an important strategy for plants to adapt to drought. However, the understanding of how complexes of plant-functional traits vary along the continuum from isohydry to anisohydry remains insufficient. In this study, we investigated a proxy of the degree of iso/anisohydry-the water potential at stomatal closure-and a series of functional traits of leaves and branches in 20 temperate broadleaf species planted in an arid limestone habitat in northern China. The results showed that the water potential at stomatal closure was significantly correlated with many functional traits. At the anisohydric end of the spectrum, species had a higher leaf carbon content and vein density, a greater stomatal length, a thicker lower leaf epidermis, higher embolism resistance, higher wood density, a greater Huber value, a greater ratio of fiber wall thickness to xylem lumen diameter, a larger proportion of total fiber wall area to xylem cross-sectional area, a lower water potential at the turgor loss point (TLP), a smaller relative water content at the TLP, a lower osmotic potential at full turgor and a smaller specific leaf area. It is concluded that a continuum of coordination and trade-offs among co-evolved anatomical and physiological traits gives rise to the spectrum from isohydry to anisohydry spanned by the 20 tree species, and the anisohydric species showed stronger stress resistance, with greater investment in stems and leaves than the isohydric species to maintain stomatal opening under drought conditions.