Simulating canopy temperature for modelling heat stress in cereals

H. Webber, F. Ewert, B. A. Kimball, S. Siebert, J. W. White, G. W. Wall, Michael J Ottman, D. N A Trawally, T. Gaiser

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Crop models must be improved to account for the effects of heat stress events on crop yields. To date, most approaches in crop models use air temperature to define heat stress intensity as the cumulative sum of thermal times (TT) above a high temperature threshold during a sensitive period for yield formation. However, observational evidence indicates that crop canopy temperature better explains yield reductions associated with high temperature events than air temperature does. This study presents a canopy level energy balance using Monin-Obukhov Similarity Theory (MOST) with simplifications about the canopy resistance that render it suitable for application in crop models and other models of the plant environment. The model is evaluated for a uniform irrigated wheat canopy in Arizona and rainfed maize in Burkina Faso. No single variable regression relationships for key explanatory variables were found that were consistent across sowing dates to explain the deviation of canopy temperature from air temperature. Finally, thermal times determined with simulated canopy temperatures were able to reproduce thermal times calculated with observed canopy temperature, whereas those determined with air temperatures were not.

Original languageEnglish (US)
Pages (from-to)143-155
Number of pages13
JournalEnvironmental Modelling and Software
Volume77
DOIs
StatePublished - Mar 1 2016

Fingerprint

cereal
canopy
modeling
Crops
air temperature
temperature
crop
Temperature
Air
sowing date
Hot Temperature
crop yield
energy balance
wheat
maize
Energy balance

Keywords

  • Canopy temperature
  • Cereals
  • Crop models
  • Heat stress

ASJC Scopus subject areas

  • Ecological Modeling
  • Environmental Engineering
  • Software

Cite this

Webber, H., Ewert, F., Kimball, B. A., Siebert, S., White, J. W., Wall, G. W., ... Gaiser, T. (2016). Simulating canopy temperature for modelling heat stress in cereals. Environmental Modelling and Software, 77, 143-155. https://doi.org/10.1016/j.envsoft.2015.12.003

Simulating canopy temperature for modelling heat stress in cereals. / Webber, H.; Ewert, F.; Kimball, B. A.; Siebert, S.; White, J. W.; Wall, G. W.; Ottman, Michael J; Trawally, D. N A; Gaiser, T.

In: Environmental Modelling and Software, Vol. 77, 01.03.2016, p. 143-155.

Research output: Contribution to journalArticle

Webber, H, Ewert, F, Kimball, BA, Siebert, S, White, JW, Wall, GW, Ottman, MJ, Trawally, DNA & Gaiser, T 2016, 'Simulating canopy temperature for modelling heat stress in cereals', Environmental Modelling and Software, vol. 77, pp. 143-155. https://doi.org/10.1016/j.envsoft.2015.12.003
Webber, H. ; Ewert, F. ; Kimball, B. A. ; Siebert, S. ; White, J. W. ; Wall, G. W. ; Ottman, Michael J ; Trawally, D. N A ; Gaiser, T. / Simulating canopy temperature for modelling heat stress in cereals. In: Environmental Modelling and Software. 2016 ; Vol. 77. pp. 143-155.
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