Night-time leaf wetting process was analyzed in relation to micrometeorological conditions in a semi-arid cornfield and its effect was examined in the following morning with reference to the leaf-to-air humidity gradient which is a driving force in transpiration. Leaf wetness occurred due to dew formation under clear and calm night conditions which decreased canopy surface temperature to the air dew-point temperature. The amount of dew on leaves collected around sunrise (06:00) was 26.4-104.3 g m−2 · leaf area, which corresponded to 0.07-0.27 mm water. Leaf wetness remained until around 10:00 and significantly decreased leaf temperature. As a result, the leaf-to-air humidity gradient also decreased in the wetted leaf compared to the non-wetted leaf. These results suggest that night-time leaf wetting induces lower transpiration rate and may play a role in diminishing plant water stress due to excess transpirational water loss in the morning in semi-arid environments. Further studies are needed in order to demonstrate this possible effect.
Dohnal M., Černy T., Votrubova J. & Tesař M. 2014. Rainfall interception and spatial variability of throughfall in spruce stand. J. Hydrol. Hydromech. 62: 277-284.
Garratt J. R. & Segal M. 1988. On the contribution of atmospheric moisture to dew formation. Boundary-Layer Meteorol. 45: 209-236.
Idso S. B., Jackson R. D., Ehrler W. L. & Michell S. T. 1969. A method for determination of infrared emittance of leaves. Ecology 50: 899-902.
Jacobs A. F. G, Heusinkveld B. G. & Kruit R. J. W. 2006. Contribution of dew to the water budget of a grassland area in the Netherlands. Water Resour. Res. 42: W03413.
Kitano M. & Eguchi H. 1987. Air humidity within boundary layer of a transpiring leaf. II. Profile of water vapor density within the boundary layer. Biotronics 16: 47-55.
Kobayashi T., Teshima J., Mori M., Yasutake D.,WangW. & Cho H. 2009. Identification of the composite parameters of the BBH-B model specifying the effects of biohydrologic processes in the water balance of crop fields. Biologia 64: 478-482.
Matsui T., Eguchi H. & Mori K. 1981. Control of dew and frost formations on leaf by radiative cooling. Environ. Control Biol. 19: 51-57.
Monteith J. L. & Unsworth M. H. 1990. Principles of Environmental Physics. 2nd Edition. Edward Arnold, England, 291 pp.
Moratiel R., Spano D., Nicolosi P. & Snyder R. L. 2013. Correcting soil water balance calculations for dew, fog, and light rainfall. Irrig. Sci. 31: 423-429.
Mori M., Nagai H., Ogata T., Yasutake D. & Kitano M. 2013. Soil moisture variability on a steep slope near a ridge in a forested mountain range, Shikoku, Japan: a model study. Biologia 68: 1109-1112.
Pan Y., Wang X. & Zhang Y. 2010. Dew formation characteristics in a revegetation-stabilized desert ecosystem in Shapotou area, Northern China. J. Hydrol. 387: 265-272.
Wang W., Kobayashi T., Yasutake D., Kitano M., Cho H., Araki T. & Yoshikoshi H. 2008. Experiments on the control of salinity and sodicity in surface-irrigated fields in the upper Yellow River valley (I). J. Fac. Agric. Kyushu Univ. 52: 251-256.
Yasutake D., Araki T., Wang W., Kobayashi T., Cho H., Mori M. & Kitano M. 2009. Analysis of salts transport affected by root absorption capacity in surface-irrigated fields in the upper Yellow River basin. Biologia 64: 570-574.
Yasutake D., Kitano M., Kobayashi T., Hidaka K., Wajima T. & He W. 2006. Evaluation of canopy transpiration rate by applying a plant hormone “abscisic acid”. Biologia 61 (Suppl. 19): S315-S319.
Yasutake D., Yu X., Asano T., Ishikawa M., Mori M., Kitano M. & Ishikawa K. 2014. Control of greenhouse humidity and airflow with fogging and circulation systems and its effect on leaf conductance in cucumber plants. Environ. Control Biol. 52: 101-105.
Yoshikoshi H., Wang W., Cho H., Araki T., Yasutake D., Zhou J., Urayama K., Wu Y., Kobayashi T. & Kitano M. 2008. Experiments on the control of salinity and sodicity in surfaceirrigated fields in the upper Yellow River valley (II) Observation system and calibration. J. Fac. Kyushu Univ. 53: 257-263.
Yoshikoshi H., Kobayashi T., Wang W. & Yasutake D. 2009. A characteristic feature of diurnal air temperature variation in the upper Yellow River valley in a semi-arid region. J. Agric. Meteorol. 65: 215-219.
Zhang Q., Wang S., Yang F., Yue P., Yao T. & Wang W. 2015. Characteristics of dew formation and distribution, and its contribution to the surface water budget in a semi-arid region in China. Boundary-Layer Meteorol. 154: 317-331.