The role of thermodiffusion in transpiration
© 2024 The Authors. New Phytologist © 2024 New Phytologist Foundation.
| Publié dans: | The New phytologist. - 1979. - 243(2024), 4 vom: 07. Aug., Seite 1301-1311 |
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| Auteur principal: | |
| Autres auteurs: | , |
| Format: | Article en ligne |
| Langue: | English |
| Publié: |
2024
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| Accès à la collection: | The New phytologist |
| Sujets: | Journal Article boundary layers leaf thermoregulation reverse transpiration thermodiffusion transpiration Water 059QF0KO0R |
| Résumé: | © 2024 The Authors. New Phytologist © 2024 New Phytologist Foundation. Plant leaf temperatures can differ from ambient air temperatures. A temperature gradient in a gas mixture gives rise to a phenomenon known as thermodiffusion, which operates in addition to ordinary diffusion. Whilst transpiration is generally understood to be driven solely by the ordinary diffusion of water vapour along a concentration gradient, we consider the implications of thermodiffusion for transpiration. We develop a new modelling framework that introduces the effects of thermodiffusion on the transpiration rate, E. By applying this framework, we quantify the proportion of E attributable to thermodiffusion for a set of physiological and environmental conditions, varied over a wide range. Thermodiffusion is found to be most significant (in some cases > 30% of E) when a leaf-to-air temperature difference coincides with a relatively small water vapour concentration difference across the boundary layer; a boundary layer conductance that is large as compared to the stomatal conductance; or a relatively low transpiration rate. Thermodiffusion also alters the conditions required for the onset of reverse transpiration, and the rate at which this water vapour uptake occurs |
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| Description: | Date Completed 18.07.2024 Date Revised 18.07.2024 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1469-8137 |
| DOI: | 10.1111/nph.19642 |