Leaf morpho-anatomical adjustments in a Quercus pubescens forest after 10 years of partial rain exclusion in the field.

IF 3.5 2区 农林科学 Q1 FORESTRY
Justine Laoué, Guillermo Gea-Izquierdo, Sylvie Dupouyet, María Conde, Catherine Fernandez, Elena Ormeño
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Abstract

In the Mediterranean region, a reduction of annual precipitation and a longer and drier summer season are expected with climate change by the end of the century, eventually endangering forest survival. To cope with such rapid changes, trees may modulate their morpho-anatomical and physiological traits. In the present study, we focused on the variation in leaf gas exchange and different leaf morpho-anatomical functional traits of Quercus pubescens Willd. in summer using a long-term drought experiment in natura consisting of a dynamic rainfall exclusion system where trees have been submitted to amplified drought (AD) (~-30% of annual precipitation) since April 2012 and compared them with trees under natural drought (ND) in a Mediterranean forest. During the study, we analyzed net CO2 assimilation (An), stomatal conductance (gs), transpiration (E), water-use efficiency (WUE), stomatal size and density, density of glandular trichomes and non-glandular trichomes, thickness of the different leaf tissues, specific leaf area and leaf surface. Under AD, tree functioning was slightly impacted, since only An exhibited a 49% drop, while gs, E and WUE remained stable. The decrease in An under AD was regulated by concomitant lower stomatal density and reduced leaf thickness. Trees under AD also featured leaves with a higher non-glandular trichome density and a lower glandular trichome density compared with ND, which simultaneously limits transpiration and production costs. This study points out that Q. pubescens exhibits adjustments of leaf morpho-anatomical traits which can help trees to acclimate to AD scenarios as those expected in the future in the Mediterranean region.

经过十年的部分雨水排除后,柞树林的叶片形态解剖结构发生了变化。
在地中海地区,随着气候变化,预计到本世纪末,年降水量将减少,夏季将更长、更干燥,最终危及森林的生存。为了应对这种快速变化,树木可能会调节其形态解剖和生理特征。在本研究中,我们利用一个由动态降雨排斥系统组成的长期干旱自然实验,重点研究了柞树在夏季叶片气体交换和不同叶片形态-解剖功能特征的变化。研究期间,我们分析了二氧化碳净同化(An)、气孔导度(gs)、蒸腾(E)、水分利用效率(WUE)、气孔大小和密度、腺毛和非腺毛密度、不同叶片组织的厚度、比叶面积(SLA)和叶面。在AD条件下,树木功能受到轻微影响,因为只有An下降了49%,而gs、E和WUE保持稳定。AD条件下An的下降受气孔密度降低和叶片厚度减少的影响。与 ND 相比,AD 下的树木叶片非腺体毛状体密度更高,腺体毛状体密度更低,这同时限制了蒸腾作用和生产成本。这项研究指出,Q. pubescens叶片形态解剖特征的调整可以帮助树木适应地中海地区未来预计会出现的干旱加剧的情况。
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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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