叶片气孔构造和光合作用特征共同影响气候梯度森林的叶片水分利用效率。

IF 8.3 1区 生物学 Q1 PLANT SCIENCES New Phytologist Pub Date : 2024-09-02 DOI:10.1111/nph.20100
Shengnan Pan, Xin Wang, Zhengbing Yan, Jin Wu, Lulu Guo, Ziyang Peng, Yuntao Wu, Jing Li, Bin Wang, Yanjun Su, Lingli Liu
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引用次数: 0

摘要

水分利用效率(WUE)代表了植物在碳同化和水分损失之间的权衡。目前还不清楚在不同的自然森林生态系统中,叶片气孔和光合特性如何调节叶片水分利用效率的空间变化。我们研究了中国从寒温带森林到热带森林的 43 种阔叶树种。我们利用叶片δ13C对叶片WUE进行了量化,并测量了气孔性状、光合性状以及最大气孔导度( G w max $$ {G}_{{\mathrm{w}}_{{mathrm{max}} $$ ) 和最大羧化能力( V c max $$ {V}_{{\mathrm{c}}_{{mathrm{max}} $$ ) 。)我们发现,寒温带森林的叶片表现出 "快速 "碳经济性,其特点是叶氮、叶绿素、比叶面积和 V c max $$ {V}_{\mathrm{c}}_{mathrm{max}} $$ 较高,以适应较短的生长季节。然而,这些叶片表现出 "缓慢 "的水力特征,气孔较大但较少,G w max $$ {G}_{mathrm{w}}_{mathrm{max}} $$ 相似,导致叶片 WUE 较高。相比之下,热带森林的叶片气孔更小、更密集,能够对不同的光照条件做出迅速反应。然而,这种气孔构造增加了潜在的水分损失,再加上光合作用能力较低,导致叶片WUE较低。我们的研究结果有助于理解植物光合作用和气孔特征如何调节不同气候梯度下的碳水权衡,从而提高我们预测气候变化对森林碳循环和水循环影响的能力。
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Leaf stomatal configuration and photosynthetic traits jointly affect leaf water use efficiency in forests along climate gradients

  • Water use efficiency (WUE) represents the trade-off between carbon assimilation and water loss in plants. It remains unclear how leaf stomatal and photosynthetic traits regulate the spatial variation of leaf WUE in different natural forest ecosystems.
  • We investigated 43 broad-leaf tree species spanning from cold-temperate to tropical forests in China. We quantified leaf WUE using leaf δ13C and measured stomatal traits, photosynthetic traits as well as maximum stomatal conductance ( G w max ) and maximum carboxylation capacity ( V c max ).
  • We found that leaves in cold-temperate forests displayed ‘fast’ carbon economics, characterized by higher leaf nitrogen, Chl, specific leaf area, and V c max , as an adaptation to the shorter growing season. However, these leaves exhibited ‘slow’ hydraulic traits, with larger but fewer stomata and similar G w max , resulting in higher leaf WUE. By contrast, leaves in tropical forests had smaller and denser stomata, enabling swift response to heterogeneous light conditions. However, this stomatal configuration increased potential water loss, and coupled with their low photosynthetic capacity, led to lower WUE.
  • Our findings contribute to understanding how plant photosynthetic and stomatal traits regulate carbon–water trade-offs across climatic gradients, advancing our ability to predict the impacts of climate changes on forest carbon and water cycles.
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来源期刊
New Phytologist
New Phytologist 生物-植物科学
自引率
5.30%
发文量
728
期刊介绍: New Phytologist is an international electronic journal published 24 times a year. It is owned by the New Phytologist Foundation, a non-profit-making charitable organization dedicated to promoting plant science. The journal publishes excellent, novel, rigorous, and timely research and scholarship in plant science and its applications. The articles cover topics in five sections: Physiology & Development, Environment, Interaction, Evolution, and Transformative Plant Biotechnology. These sections encompass intracellular processes, global environmental change, and encourage cross-disciplinary approaches. The journal recognizes the use of techniques from molecular and cell biology, functional genomics, modeling, and system-based approaches in plant science. Abstracting and Indexing Information for New Phytologist includes Academic Search, AgBiotech News & Information, Agroforestry Abstracts, Biochemistry & Biophysics Citation Index, Botanical Pesticides, CAB Abstracts®, Environment Index, Global Health, and Plant Breeding Abstracts, and others.
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