Effect of atmospheric water vapor on photosynthesis, transpiration and canopy conductance: A case study in corn
Ben-Asher, J., Katif Center Ministry of Science, Sedot Negev (Israel). Agriecology Group | Garcia y Garcia, A., University of Wyoming Research and Extension Center, Powell (USA). Dept. of Plant Sciences | Flitcroft, I., University of Georgia, Griffin (USA). Dept. of Biological and Agricultural Engineering | Hoogenboom, G., Washington State University, Prosser (USA). AgWeatherNet
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. deltaDM/deltaRH app. 0.3 from 30% to 60% and app. 2.2 from 60% to 85%, deltaWUE/deltaRH app. 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.
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