TY - JOUR
T1 - Effect of atmospheric water vapor on photosynthesis, transpiration and canopy conductance
T2 - A case study in corn
AU - Ben-Asher, Jiftah
AU - Garcia, A.
AU - Flitcroft, I.
AU - Hoogenboom, G.
PY - 2013
Y1 - 2013
N2 - 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.
AB - 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.
KW - Absolute humidity
KW - Growth chambers
KW - Relative humidity
KW - Vapor pressure deficit
KW - Water use efficiency
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U2 - 10.17221/346/2013-pse
DO - 10.17221/346/2013-pse
M3 - Article
AN - SCOPUS:84889010522
SN - 1214-1178
VL - 59
SP - 549
EP - 555
JO - Plant, Soil and Environment
JF - Plant, Soil and Environment
IS - 12
ER -