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

Jiftah Ben-Asher, A. Garcia, I. Flitcroft, G. Hoogenboom

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)549-555
Number of pages7
JournalPlant, Soil and Environment
Volume59
Issue number12
DOIs
StatePublished - 2013

Keywords

  • Absolute humidity
  • Growth chambers
  • Relative humidity
  • Vapor pressure deficit
  • Water use efficiency

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