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利用热扩散式茎流仪监测枣树茎流量,同时利用HOBO小气候仪观测气象因子,通过曲线规律分析与相关分析分别得出枣树茎流量与各气象因子的关系曲线与相关程度,对枣树茎流量与气象因子的关系分别进行多元线性回归和逐步线性回归分析得出方程(1)和方程(2)。结果表明通过方程(2)得出的枣树茎流量模拟值与实测值差异较小。因此,通过逐步回归分析法得出的枣树茎流量与气象因子关系的多元线性回归模型可以用来模拟枣树茎流量。
The stem flow of jujube tree was monitored by thermal diffusive flowmeter and the meteorological factors were observed by HOBO microclimate meter. The curve and correlation degree between jujube stem flow and each meteorological factor were obtained by curve rule analysis and correlation analysis. Stem flow and meteorological factors were multivariate linear regression and linear regression analysis of the equation (1) and equation (2). The results showed that there was little difference between the simulated and the measured values of stem flow rate of jujube tree obtained by equation (2). Therefore, the multivariate linear regression model of jujube stem flow and meteorological factors obtained by stepwise regression analysis can be used to simulate jujube stem flow.