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Effect of atmospheric water vapor on photosynthesis, transpiration and canopy conductance: A case study in corn

Author

Listed:
  • J. Ben-Asher

    (Agriecology Group, Katif R&D Center Ministry of Science, Sedot Negev Academic Campus, Israel)

  • A. Garcia y Garcia

    (Department of Plant Sciences, University of Wyoming Research and Extension Center, Powell, USA)

  • I. Flitcroft

    (Department of Biological and Agricultural Engineering, University of Georgia, Griffin, USA)

  • G. Hoogenboom

    (AgWeatherNet, Washington State University, Prosser, USA)

Abstract

The effect of atmospheric water vapor (AV) on plants has mostly been neglected in climate impact studies. The objectives of this study were to determine the effect of AV on photosynthesis (Pn), dry matter production (DM), transpiration (Tr), leaf conductance (gl) and water use efficiency (WUE), in climate controlled chambers. The relative humidity (RH) was held near 30, 60, and 85%. DM and WUE increased with RH. δDM/δRH ~ 0.3 from 30% to 60% and ~2.2 from 60% to 85%, δWUE/δRH ~0.2 for all RH's. The improved WUE at a rate of 0.2 units for each percent of increased RH resulted from a synergy between larger gl and lower Tr at high RH. This conclusions carries a bleak message to dry regions.

Suggested Citation

  • J. Ben-Asher & A. Garcia y Garcia & I. Flitcroft & G. Hoogenboom, 2013. "Effect of atmospheric water vapor on photosynthesis, transpiration and canopy conductance: A case study in corn," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 59(12), pages 549-555.
    • Handle: RePEc:caa:jnlpse:v:59:y:2013:i:12:id:346-2013-pse
    DOI: 10.17221/346/2013-PSE
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    References listed on IDEAS

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    1. Scott Jasechko & Zachary D. Sharp & John J. Gibson & S. Jean Birks & Yi Yi & Peter J. Fawcett, 2013. "Terrestrial water fluxes dominated by transpiration," Nature, Nature, vol. 496(7445), pages 347-350, April.
    2. Manzoni, Stefano & Katul, Gabriel & Fay, Philip A. & Polley, H. Wayne & Porporato, Amilcare, 2011. "Modeling the vegetation–atmosphere carbon dioxide and water vapor interactions along a controlled CO2 gradient," Ecological Modelling, Elsevier, vol. 222(3), pages 653-665.
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