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Canopy temperature and heat stress are increased by compound high air temperature and water stress and reduced by irrigation - a modeling analysis

Luan, Xiangyu and Vico, Giulia (2021). Canopy temperature and heat stress are increased by compound high air temperature and water stress and reduced by irrigation - a modeling analysis. Hydrology and Earth System Sciences. 25 , 1411-1423
[Research article]

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Abstract

Crop yield is reduced by heat and water stress and even more when these conditions co-occur. Yet, compound effects of air temperature and water availability on crop heat stress are poorly quantified. Existing crop models, by relying at least partially on empirical functions, cannot account for the feedbacks of plant traits and response to heat and water stress on canopy temperature. We developed a fully mechanistic model, coupling crop energy and water balances, to determine canopy temperature as a function of plant traits, stochastic environmental conditions, and irrigation applications. While general, the model was parameterized for wheat. Canopy temperature largely followed air temperature under well-watered conditions. But, when soil water potential was more negative than -0.14 MPa, further reductions in soil water availability led to a rapid rise in canopy temperature - up to 10 degrees C warmer than air at soil water potential of -0.62 MPa. More intermittent precipitation led to higher canopy temperatures and longer periods of potentially damaging crop canopy temperatures. Irrigation applications aimed at keeping crops under well-watered conditions could reduce canopy temperature but in most cases were unable to maintain it below the threshold temperature for potential heat damage; the benefits of irrigation in terms of reduction of canopy temperature decreased as average air temperature increased. Hence, irrigation is only a partial solution to adapt to warmer and drier climates.

Authors/Creators:Luan, Xiangyu and Vico, Giulia
Title:Canopy temperature and heat stress are increased by compound high air temperature and water stress and reduced by irrigation - a modeling analysis
Series Name/Journal:Hydrology and Earth System Sciences
Year of publishing :2021
Volume:25
Page range:1411-1423
Number of Pages:13
Publisher:COPERNICUS GESELLSCHAFT MBH
ISSN:1027-5606
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Oceanography, Hydrology, Water Resources
URN:NBN:urn:nbn:se:slu:epsilon-p-111639
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-111639
Additional ID:
Type of IDID
DOI10.5194/hess-25-1411-2021
Web of Science (WoS)000634628200002
ID Code:23377
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Crop Production Ecology
Deposited By: SLUpub Connector
Deposited On:29 Apr 2021 12:04
Metadata Last Modified:29 Apr 2021 12:11

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