Growth of soybean at future tropospheric ozone concentrations decreases canopy evapotranspiration and soil water depletion

Research output: Contribution to journalArticlepeer-review

Abstract

Tropospheric ozone is increasing in many agricultural regions resulting in decreased stomatal conductance and overall biomass of sensitive crop species. These physiological effects of ozone forecast changes in evapotranspiration and thus in the terrestrial hydrological cycle, particularly in intercontinental interiors. Soybean plots were fumigated with ozone to achieve concentrations above ambient levels over five growing seasons in open-air field conditions. Mean season increases in ozone concentrations ([O3]) varied between growing seasons from 22 to 37% above background concentrations. The objective of this experiment was to examine the effects of future [O3] on crop ecosystem energy fluxes and water use. Elevated [O3] caused decreases in canopy evapotranspiration resulting in decreased water use by as much as 15% in high ozone years and decreased soil water removal. In addition, ozone treatment resulted in increased sensible heat flux in all years indicative of day-time increase in canopy temperature of up to 0.7 °C.

Original languageEnglish (US)
Pages (from-to)1464-1472
Number of pages9
JournalEnvironmental Pollution
Volume159
Issue number6
DOIs
StatePublished - Jun 2011

Keywords

  • Canopy temperature
  • Evapotranspiration
  • Soil moisture
  • Soybean
  • Tropospheric ozone

ASJC Scopus subject areas

  • Toxicology
  • Pollution
  • Health, Toxicology and Mutagenesis

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