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Wind Effects on Leaf Transpiration Challenge the Concept of Potential Evaporation : Volume 371, Issue 371 (12/06/2015)

By Schymanski, S. J.

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Book Id: WPLBN0004021449
Format Type: PDF Article :
File Size: Pages 9
Reproduction Date: 2015

Title: Wind Effects on Leaf Transpiration Challenge the Concept of Potential Evaporation : Volume 371, Issue 371 (12/06/2015)  
Author: Schymanski, S. J.
Volume: Vol. 371, Issue 371
Language: English
Subject: Science, Proceedings, International
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Or, D., & Schymanski, S. J. (2015). Wind Effects on Leaf Transpiration Challenge the Concept of Potential Evaporation : Volume 371, Issue 371 (12/06/2015). Retrieved from http://www.ebooklibrary.org/


Description
Description: Swiss Federal Institute of Technology, Zurich, Switzerland. Transpiration is commonly conceptualised as a fraction of some potential rate, driven by so-called atmospheric evaporative demand. Therefore, atmospheric evaporative demand or potential evaporation is generally used alongside with precipitation and soil moisture to characterise the environmental conditions that affect plant water use. Consequently, an increase in potential evaporation (e.g. due to climate change) is believed to cause increased transpiration and/or vegetation water stress. In the present study, we investigated the question whether potential evaporation constitutes a meaningful reference for transpiration and compared sensitivity of potential evaporation and leaf transpiration to atmospheric forcing. A physically-based leaf energy balance model was used, considering the dependence of feedbacks between leaf temperature and exchange rates of radiative, sensible and latent heat on stomatal resistance. Based on modelling results and supporting experimental evidence, we conclude that stomatal resistance cannot be parameterised as a factor relating transpiration to potential evaporation, as the ratio between transpiration and potential evaporation not only varies with stomatal resistance, but also with wind speed, air temperature, irradiance and relative humidity. Furthermore, the effect of wind speed in particular implies increase in potential evaporation, which is commonly interpreted as increased water stress, but at the same time can reduce leaf transpiration, implying a decrease in water demand at leaf scale.

Summary
Wind effects on leaf transpiration challenge the concept of potential evaporation

Excerpt
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