Hydraulic trade-off and coordination strategies mediated by leaf functional traits of desert shrubs.
Hydraulic trade-off and coordination strategies mediated by leaf functional traits of desert shrubs.
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DOI：
10.3389/fpls.2022.938758
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发表时间：
2022
影响因子：
5.6
通讯作者：
Zhang, Zhishan
中科院分区：
文献类型：
--
作者：
Huo, Jianqiang;Shi, Yafei;Chen, Jiajia;Zhang, Hongxia;Feng, Li;Zhao, Yang;Zhang, Zhishan
荒漠灌木在荒漠化防治和植被恢复中发挥着重要作用，特别是受气候变化引起的干旱的影响。然而，与沙漠灌木的水力功能性状相关的水力策略仍不清楚。以北方腾格里沙漠东南缘的8种不同生活型和形态的沙生灌木为材料，研究叶片水力功能性状介导的水力策略。昼夜叶水势变化，叶水力效率和安全，水力安全裕度，水力电容，和水势和相对含水量在膨压损失点观察到显着不同的物种，这表明，叶水力功能性状强烈相关的物种，即使生活在同一环境中。叶片水力效率高的灌木午间叶水势和叶片水力安全性低，表明叶片水力效率与水力安全性和最小叶水势之间存在较强的权衡关系，而叶片水力安全性与最小叶水势之间也存在协调关系。叶片水力容量越大的灌木具有越大的水力安全裕度，说明叶片水力容量与水力安全裕度之间具有协调性。研究结果表明，最小日叶水势作为一个易于测量的参数，可以初步预测荒漠灌木的叶片导水率和抗栓塞性，为荒漠植被恢复重建中乡土灌木作为优先物种的水力权衡和协调策略提供重要的参考。
Desert shrubs play important roles in desertification control and vegetation restoration, which are particularly affected by droughts caused by climate change. However, the hydraulic strategies associated with hydraulic functional traits of desert shrubs remain unclear. Here, eight desert shrub species with different life forms and morphologies were selected for a common garden experiment at the southeast edge of the Tengger Desert in northern China to study the hydraulic strategies mediated by leaf hydraulic functional traits. Diurnal leaf water potential change, leaf hydraulic efficiency and safety, hydraulic safety margin, hydraulic capacitance, and water potential and relative water content at the turgor loss point were observed to significantly differ among species, suggesting that leaf hydraulic functional traits were strongly associated with species even when living in the same environment. Additionally, shrubs with greater leaf hydraulic efficiency had lower midday leaf water potential and leaf hydraulic safety, suggesting that leaf hydraulic efficiency had a strong trade-off with hydraulic safety and minimum leaf water potential, whereas there was also a coordination between leaf hydraulic safety and the leaf minimal water potential. Moreover, shrubs with higher leaf hydraulic capacitance had greater hydraulic safety margins, indicating coordination between leaf hydraulic capacitance and hydraulic safety margin. Overall, this study indicated that minimal daily leaf water potential, as an easily measured parameter, may be used preliminarily to predict leaf hydraulic conductivity and the resistance to embolism of desert shrubs, providing critical insights into hydraulic trade-off and coordination strategies for native shrubs as priority species in desert vegetation restoration and reconstruction.
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作者：
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