Rising ozone concentrations decrease soybean evapotranspiration and water use efficiency whilst increasing canopy temperature

Andy VanLoocke, Amy M. Betzelberger, Elizabeth Ainsworth, Carl Bernacchi

Research output: Contribution to journalArticle

Abstract

Here, we investigated the effects of increasing concentrations of ozone ([O 3]) on soybean canopy-scale fluxes of heat and water vapor, as well as water use efficiency (WUE), at the Soybean Free Air Concentration Enrichment (SoyFACE) facility. • Micrometeorological measurements were made to determine the net radiation (R n), sensible heat flux (H), soil heat flux (G 0) and latent heat flux (λET) of a commercial soybean (Glycine max) cultivar (Pioneer 93B15), exposed to a gradient of eight daytime average ozone concentrations ranging from approximately current (c. 40ppb) to three times current (c. 120ppb) levels. • As [O 3] increased, soybean canopy fluxes of λET decreased and H increased, whereas R n and G 0 were not altered significantly. Exposure to increased [O 3] also resulted in warmer canopies, especially during the day. The lower λET decreased season total evapotranspiration (ET) by c. 26%. The [O 3]-induced relative decline in ET was half that of the relative decline in seed yield, driving a 50% reduction in seasonal WUE. • These results suggest that rising [O 3] will alter the canopy energy fluxes that drive regional climate and hydrology, and have a negative impact on productivity and WUE, key ecosystem services.

Original languageEnglish (US)
Pages (from-to)164-171
Number of pages8
JournalNew Phytologist
Volume195
Issue number1
DOIs
StatePublished - Jul 1 2012

Fingerprint

Ozone
Soybeans
ozone
water use efficiency
evapotranspiration
canopy
soybeans
Hot Temperature
Temperature
Water
heat
temperature
Hydrology
free air carbon dioxide enrichment
Radiation
Steam
Climate
water vapor
ecosystem services
hydrology

Keywords

  • Evapotranspiration
  • Free air concentration enrichment (FACE)
  • Surface energy balance
  • Tropospheric ozone
  • Vegetation-climate interactions
  • Water use efficiency (WUE)

ASJC Scopus subject areas

  • Physiology
  • Plant Science

Cite this

Rising ozone concentrations decrease soybean evapotranspiration and water use efficiency whilst increasing canopy temperature. / VanLoocke, Andy; Betzelberger, Amy M.; Ainsworth, Elizabeth; Bernacchi, Carl.

In: New Phytologist, Vol. 195, No. 1, 01.07.2012, p. 164-171.

Research output: Contribution to journalArticle

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