Unsaturation of vapour pressure inside leaves: fundamental, but unknown

叶子内部蒸气压的不饱和度：基本，但未知

• 批准号: DP150100588
• 负责人: Prof Lucas Cernusak
• 金额: $ 35.25万
• 依托单位: James Cook University
• 依托单位国家: 澳大利亚
• 项目类别: Discovery Projects
• 财政年份: 2015
• 资助国家: 澳大利亚
• 起止时间: 2015-03-30 至 2018-03-29
• 项目状态: 已结题
• 来源: https://dataportal.arc.gov.au/RGS/Web/Grants/DP150100588
• 关键词: Unsaturation; vapour; pressure; inside; leaves

This project aims to determine when and to what extent the air inside leaves becomes unsaturated with water vapour. All current interpretation and modelling of leaf gas exchange assumes saturation under all circumstances. Compelling evidence has been obtained that suggests this is not true under moderate air vapour pressure deficits. A novel technique will be employed to assess the water vapour concentration of the air inside leaves based on stable isotope analysis of carbon dioxide and water vapour exchanged between leaves and air. The project is expected to provide fundamental knowledge about how stomata regulate photosynthesis and water use, with significant implications for modelling vegetation function and for improving the performance of crop plants.

该项目旨在确定树叶内部的空气何时以及在多大程度上变得不饱和。目前对叶片气体交换的所有解释和建模都假定在所有情况下都是饱和的。已经获得的令人信服的证据表明，在中等的空气蒸气压赤字下，这是不正确的。将采用一种新的技术，根据对树叶和空气之间交换的二氧化碳和水蒸气的稳定同位素分析，评估树叶内空气的水蒸气浓度。该项目预计将提供有关气孔如何调节光合作用和水分利用的基础知识，对模拟植被功能和改善作物性能具有重要意义。