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Measurement of Leaf Hydraulic Conductance and Stomatal Conductance and Their Responses to Irradiance and Dehydration Using the Evaporative Flux Method EFM
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树枝和树根之间的水力脆弱性差异随着环境干旱而增加.

Weize Tang1,2, Xiaorong Liu3, Xingyun Liang1

  • 1Guangdong Provincial Key Laboratory of Applied Botany and Key Laboratory of National Forestry and Grassland Administration on Plant Conservation and Utilization in Southern China, South China Botanical Garden, Chinese Academy of Sciences, No. 723, Xingke Road, Tianhe District, Guangzhou, 510650, China.

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概括

植物树叶脆弱性细分,树枝和根 (P50根-树枝) 之间的栓塞阻力差异,随着干旱性而增加. 这种液压安全调整主要是由于分支叶特征的变化造成的.

关键词:
血栓栓形成的原因是环境变量 环境变量液压导电能力 液压导电能力液压安全 液压安全齐伦体解剖学 齐伦体解剖学

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科学领域:

  • 植物生理学 植物生理学
  • 生态生态学 生态生态学
  • 水文学 水文学

背景情况:

  • 植物体对栓塞的脆弱性是用P50量化,即在50%的导电性损失下水的潜力.
  • 液压脆弱性细分假设假设树枝和根之间的栓塞阻力存在正差异 (P50根-树枝> 0).
  • 这种假设的广泛适用性及其在干旱度梯度上的变化仍然不清楚.

研究的目的:

  • 为了研究P50根枝和干旱度在各种木质物种之间的关系.
  • 确定环境因素,特别是干旱程度如何影响液压漏洞细分.
  • 了解基于特征的机制,这些机制是水力漏洞中观察到的模式的基础.

主要方法:

  • 编制了来自四个生物体的104种木质物种的树枝和根的液压和解剖数据.
  • 包括10种额外物种的新液压测量.
  • 分析了P50根-枝和干旱度相关的环境因素之间的关系.

主要成果:

  • 在所有研究的物种中观察到正的P50根-枝关系.
  • 随着干旱度的增加,P50根枝显著增加.
  • 在较高的干旱条件下,分支叶表现出向更安全的特征 (更窄的导管,更负的P50) 的转变,而根叶特征保持一致.

结论:

  • 树枝和树根之间的水力脆弱性差异在干旱环境中更为明显.
  • 干燥驱动器增加了分支中的液压安全性,主要是通过修改西管道特征.
  • 这些发现支持并扩展了液压脆弱性细分假设,突出了其在干燥气候中的适应意义.