温带沙漠灌木物种水力策略的全植物视角。

IF 3.5 2区 农林科学 Q1 FORESTRY
Fengsen Tan, Xu Li, Wenxu Cao, Shidan Zhu, Na Duan, Qinghe Li
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引用次数: 0

摘要

沙漠灌木在控制沙漠化和促进植被重建方面发挥着至关重要的作用,但干旱常常阻碍它们的生长。研究沙漠灌木的水力策略对于了解其干旱适应性和预测气候变化下的未来动态非常重要。在这项研究中,我们测量了中国北方 19 种荒漠灌木根、茎和叶的水力相关特性。我们的目的是探索不同植物器官之间的水力协调和分割。结果如下 (1) 特定根长(SRL)与导致茎导水率损失 50%的水势(P50stem)呈正相关,而与茎水力安全系数(HSMstem)呈负相关。这表明细根的吸水效率与茎秆抗栓塞能力和水力安全之间存在权衡。(2)诱导叶片水导损失 50%的水势(P50leaf)的负值明显小于 P50stem,细根张力损失点(TLProot)的负值也明显小于 P50stem,这表明主茎和末端器官之间存在水力分段。(3) TLPleaf 的负值最大,表明叶片和茎栓塞严重后出现叶片萎蔫。叶片的高抗干燥性可能是在相对较短的生长期内增加碳增量的重要生理机制。总之,本研究从植物整体的角度阐明了沙漠灌木采用的水力策略。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A whole-plant perspective of hydraulic strategy in temperate desert shrub species.

Desert shrubs play a crucial role in controlling desertification and promoting revegetation, but drought often hinders their growth. Investigating the hydraulic strategies of desert shrubs is important in order to understand their drought adaptation and predict future dynamics under climate change. In this study, we measured the hydraulic-related characteristics of roots, stems and leaves in 19 desert shrub species from northern China. We aimed to explore the hydraulic coordination and segmentation between different plant organs. The results were as follows: (i) specific root length was positively correlated with the water potential inducing a 50% loss in stem hydraulic conductivity (P50stem) and negatively correlated with stem hydraulic safety margin. This suggested that water uptake efficiency of the fine roots was traded off with stem embolism resistance and hydraulic safety. (ii) The water potential inducing a 50% loss in leaf hydraulic conductance was significantly less negative than P50stem, and fine root turgor loss point was significantly less negative than P50stem, indicating a hydraulic segmentation between the main stem and terminal organs. (iii) The most negative leaf turgor loss point indicated that leaf wilting occurred after substantial leaf and stem embolism. The high desiccation resistance of the leaves may serve as an important physiological mechanism to increase carbon gain in a relatively brief growth period. In summary, this study elucidated the hydraulic strategies employed by desert shrubs from a whole-plant perspective.

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来源期刊
Tree physiology
Tree physiology 农林科学-林学
CiteScore
7.10
自引率
7.50%
发文量
133
审稿时长
1 months
期刊介绍: Tree Physiology promotes research in a framework of hierarchically organized systems, measuring insight by the ability to link adjacent layers: thus, investigated tree physiology phenomenon should seek mechanistic explanation in finer-scale phenomena as well as seek significance in larger scale phenomena (Passioura 1979). A phenomenon not linked downscale is merely descriptive; an observation not linked upscale, might be trivial. Physiologists often refer qualitatively to processes at finer or coarser scale than the scale of their observation, and studies formally directed at three, or even two adjacent scales are rare. To emphasize the importance of relating mechanisms to coarser scale function, Tree Physiology will highlight papers doing so particularly well as feature papers.
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