Dry inside: progressive unsaturation within leaves with increasing vapour pressure deficit affects estimation of key leaf gas exchange parameters

IF 8.3 1区生物学 Q1 PLANT SCIENCES New Phytologist Pub Date : 2024-08-28 DOI:10.1111/nph.20078

Haoyu Diao, Lucas A. Cernusak, Matthias Saurer, Arthur Gessler, Rolf T. W. Siegwolf, Marco M. Lehmann

引用次数: 0

Abstract

Abstract Image

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

叶内干燥：随着蒸汽压力不足的增加，叶内逐渐不饱和会影响关键叶片气体交换参数的估算

摘要气候变化不仅会导致气温升高，还会增加空气中的蒸气压差（VPD）。了解 VPD 对叶片气体交换的直接影响对于建立精确的气孔功能模型至关重要。我们对四种常见的欧洲树种进行了叶片气体交换和在线同位素辨别的综合测量，VPD范围为0.8-3.6 kPa，同时保持恒温，没有土壤水分限制。除了应用叶内饱和蒸气压（ei）的标准假设外，我们还通过二氧化碳和水蒸气的氧同位素分辨推断出了 ei。ei 随着 VPD 的增加而逐渐不饱和，这在不同树种之间是一致的，导致在最高测试 VPD 时细胞间相对湿度低至 0.73 ± 0.11。与考虑到不饱和的计算结果相比，假定 ei 饱和会高估气孔导度和叶片内二氧化碳摩尔分数随 VPD 增加而降低的程度。此外，只有在考虑 ei 不饱和的情况下，叶肉传导才会随着 VPD 的增加而显著降低。我们建议，在与叶片气体交换有关的测量和气孔模型中，不应忽视不饱和 ei 的可能性，尤其是在高 VPD 条件下。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

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.