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Published (Version of record)CC BY V4.0, Open Access
Published (Version of record)CC BY V4.0, Open
Journal article
The role of thermodiffusion in transpiration
The New phytologist, Vol.243(4), pp.1301-1311
08/2024
PMID: 38453691
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Abstract
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.
Details
- Title
- The role of thermodiffusion in transpiration
- Creators
- Danielle S Griffani - Southern Cross UniversityPierre Rognon - University of SydneyGraham D Farquhar - Australian National University
- Publication Details
- The New phytologist, Vol.243(4), pp.1301-1311
- Publisher
- Wiley-Blackwell Publishing Ltd.
- Grant note
- CE140100015 / Australian Research Council
- Identifiers
- 991013173907002368
- Copyright
- (c) 2024 The Authors. This is an open access article under the terms of the Creative Commons Attribution License.
- Academic Unit
- Engineering; Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article