Omar Garcia-Tejera, Axel Ritter, Carlos M Regalado
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The results revealed that a combination of low radiation and leaf wetness significantly improves leaf stomata conductance and increases the specific leaf area (SLA). Changes in SLA were driven by leaf size changes. However, the minimum leaf conductance (gmin) did not respond to any of the treatments. The simulations focused on exploring the impact of radiation and canopy wetness on transpiration efficiency (TE), i.e. the ratio between photosynthesis (An) and transpiration (Tc). The simulations demonstrated that TE increased exponentially as the canopy was gradually wetted, regardless of the radiation environment. This increase in TE results from Tc approaching zero while An maintains positive values. 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引用次数: 0
摘要
云雾林是一种独特的生物群落,大部分季节都在多雾环境中生长。云雾林中的雾有两个关键作用:一是减少入射辐射,二是创造潮湿环境,使树冠湿润。本文旨在研究辐射和湿度对云雾林(亚热带地区的一种云雾林树种)的综合影响。实验包括一个具有两种辐射和叶片湿度水平的受控环境:低辐射/湿润条件和高辐射/不湿润条件;以及三种处理:连续低辐射和湿润(CLR)、连续高辐射和不湿润(CHR)以及交替高低辐射和交替湿润(AHLR)。结果表明,低辐射和叶片湿润的组合能显著改善叶片气孔导度,增加比叶面积(SLA)。比叶面积的变化是由叶片大小的变化驱动的。然而,最小叶片传导率(gmin)对任何处理都没有反应。模拟的重点是探索辐射和冠层湿度对蒸腾效率(TE)的影响,即光合作用(An)和蒸腾作用(Tc)之间的比率,即 TE = An/Tc。模拟结果表明,随着冠层逐渐变湿,蒸腾速率呈指数增长,与辐射环境无关。TE 增加的原因是 Tc 接近于零,而 An 保持正值。总之,这项研究提供了对雾如何改变法雅树功能以及其他云林树种潜在功能的综合理解。
The combined effect of diffuse radiation and leaf wetness on functional traits and transpiration efficiency on a cloud forest species.
Cloud forests are unique biomes that thrive in foggy environments for a substantial part of the season. Fog in cloud forests plays two critical roles: it reduces incoming radiation and creates a humid environment, leading to the wetting of the canopy. This paper aims to investigate the combined effect of both radiation and wetness on Myrica faya Wilbur-a cloud forest species present in subtropical regions-both directly in plants and through simulations. Experiments consisted of a controlled environment with two levels of radiation and leaf wetness: low radiation/wet conditions, and high radiation/no-wetness; and three treatments: continuous low radiation and wetness, continuous high radiation and no wetness and alternate high low radiation and alternate wetness. The results revealed that a combination of low radiation and leaf wetness significantly improves leaf stomata conductance and increases the specific leaf area (SLA). Changes in SLA were driven by leaf size changes. However, the minimum leaf conductance (gmin) did not respond to any of the treatments. The simulations focused on exploring the impact of radiation and canopy wetness on transpiration efficiency (TE), i.e. the ratio between photosynthesis (An) and transpiration (Tc). The simulations demonstrated that TE increased exponentially as the canopy was gradually wetted, regardless of the radiation environment. This increase in TE results from Tc approaching zero while An maintains positive values. Overall, this study provides an integrated understanding of how fog alters M. faya functioning and, potentially, other cloud forest tree species.
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.