Effects of Meteorological Factors on Daytime Transpiration of Citrus Trees

GE Liang;DONG Xiao-hua;LI Lu;ZHAO Qiao;YAN Dong-ying;Hydraulic and Environmental Engineering,Three Gorges University;Water Resources Security Protection Collaborative Innovation Center of Hubei Province;PowerChina Guiyang Engineering Corporation Limited;

GE Liang%DONG Xiao-hua%LI Lu%ZHAO Qiao%YAN Dong-ying%Hydraulic and Environmental Engineering,Three Gorges University%Water Resources Security Protection Collaborative Innovation Center of Hubei Province%PowerChina Guiyang Engineering Corporation Limited

daytime transpiration rate;;meteorological factors;;citrus trees;;empirical model

In this paper,the packaged stem sap flow gauge was used to continually measure the sap flow dynamics of citrus trees. The meteorological factors,including net solar radiation,ambient temperature and relative humidity,were detected at the same time. The correlation between the transpiration rate and meteorological factors were analyzed. The results showed that the transpiration curve of citrus trees was bimodal type; the transpiration rate of potted citrus trees was positively correlated with net solar radiation and ambient temperature,and negatively correlated with environmental relative humidity; the absolute values of the correlation coefficients of all the meteorological factors from large to small were ranged as ambient temperature( 0.849),net solar radiation( 0.813),relative humidity(-0.810),the wind speed( 0.570) and dew point( 0.219),and ambient temperature was the dominant environmental factor. Then an empirical regression model was established by using the three main environmental factors described above,the simulation results of empirical models was more accurate than that of the PM model. The empirical models can be used to predict the water consumption by transpiration of citrus trees in the Yichang area.