Thermal dissipation sap flow rate probe was used to measure trunk sap flow dynamic of Poplar during the growing season from September 2011 to May 2012 in coastal region of China. The relationship of trunk sap flow rate and meteorological factors was analyzed. The results showed that the process of sap flow rate of Poplar presented an obvious day and night alternate phenomenon. The diurnal variation of sap flow was a single-peak curve in sunny day and a multi-peak curve in rainy day. According to Pearson correlation analysis, the diurnal sap flow rate of Poplar was positively correlated with solar radiation and atmospheric temperature, and negatively correlated with air relative humidity. The regression analysis showed that there was a significant correlation between multi-day sap flow rate and solar radiation, and the determination coefficient was 0.287 and 0.778 in summer and autumn, respectively. The linear regression model of multi-day sap flow with meteorological multi-factor was remarkable correlation, and the determination coefficient was 0.577 and 0.791 in summer and autumn, respectively. The regression model of multi-day sap flow with meteorological multi-factor was better than with single meteorological factor.
Assimilate, process and analyse thermal dissipation sap flow data using the TREX
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