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Cooling Effect and Physiological Mechanism of Parthenocissus tricuspidata and Parthenocissus quinquefolia Planch.

WEI Yongsheng1,2,LU Xinjian3,ZHOU Xincheng3,4 and Wang Kun2(1.College of Life Science,Northwest A&F University,Yangling Shaanxi 712100,China;2.College of Animal Science and Technology,China Agricultural University,Beijing 100094 China;3.Soil and Water Conservation College,Beijing Foresty University,Beijing 100083,Ching;4.Slope Revegetation Institue,Beijing Foresty University,Beijing 100083,China)  
Parthenocissus tricuspidata and Parthenocissus quinquefolia Planch.are used as vertical greening plants to cover the building envelope widely.They can mitigate ambient temperature.In order to determine the deviation between the cooling effects of them,non-contact infrared temperature thermometer(Optris Minisight),Li-1600 steady state porometer and hand-held OS-30p chlorophyll fluorometer were employed to examine the temperature of bear wall,plant-covered wall,canopy,leaf and ambient air,transpiration and stomatal resistance,leaf albedo and transmission,basic chlorophyll fluorescence Fo,Fm and Fv/Fm.The result showed that there were inverted V-shaped curves for both bare facade corresponding two plants.The maximum bare wall temperature were(41.0±0.08)℃ and(42.5±0.07)℃,mean day cooling values were(2.7±0.49)℃ and(5.1±0.55)℃,maximum cooling values were(8.2±0.58)℃ and(11.0±0.28)℃ for P.Tricuspidata and P.quinquefolia Planch.,respectively.Transpiration of P.quinquefolia was(9.1±2.0) μg·s-1·cm-2 which was 8.3 times of P.Tricuspidata.The reduction percentage of solar light which irradiated on plant-covered wall was 5.6%.Fv/Fm was 0.80±0.01 higher than 0.75±0.00 for P.Tricuspidata.Fo and Fm were 63.6±1.17and 315.8±13.7,63.6±1.17and 315.8±13.7 for P.Tricuspidata and P.quinquefolia Planch.,respectively.It can be concluded from above results that the cooling effects of was higher that as an integrate actions of transpiration,leaf albedo,transmission and photochemistry.
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