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| Analysis of Variation of Sap Flow Velocity and Water Consumption of Grapevine in the Nanhu Oasis, Dunhuang, China |
| Bai Yan, Zhu Gaofeng, Zhang Kun, Ma Ting |
| Collaborative Innovation Centre for Arid Environments and Climate Change, Key Laboratory of Western China's Environmental Systems with the Ministry of Education, Lanzhou University, Lanzhou 730000, China |
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Abstract By using FLOW32 sap flow sensors, the researchers employ the heat balance method to study sap flow velocity of grapevine in the Nanhu Oasis in Dunhuang, China. After detecting meteorological factors by automatic weather station, the paper analyzes the diurnal fluctuations of sap flow velocity of grapevine under different weather conditions, and conducts simple regression analysis between sap flow velocity of grapevine and meteorological factors, and establishes a multiple linear regression model to analyze the water-consuming pattern of grapevine. The result shows that, sap flow velocity varies in different weather conditions with statistical significance: the daily mean on sunny days is greater than that on cloudy days, with the rainy days the lowest. Analysis of partial correlations and regression analysis between sap flow velocity of grapevine and the main meteorological factors show that, sap flow velocity of grapevine correlates linearly with photosynthetically active radiation (PAR) and vapor pressure deficit (VPD), and correlates curve-linearly with canopy temperature (CT) and canopy relative humidity (CRH) in the pattern of PAR > VPD > CT > CRH. The result of multiple regression modeling can help better predict water consumption of grapevine (R2=0.95), and comparative analysis of water consumption of grapevines can help improve the local agricultural watering and planting.
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Received: 25 November 2013
Published: 20 January 2015
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2015, Vol. 35 
