避雨栽培下番茄茎流通径和灰色关联度分析

Analysis of Path and Gray Correlation for Stem Sap of Tomato under Rain-shelter Cultivation

根据避雨栽培番茄试验结果,研究了不同供水条件及天气情况下番茄茎流流速的日变化过程,采用通径和灰色关联度分析,以光合有效辐射、太阳辐射、饱和水汽压差、相对湿度、气温和土壤含水量6个环境因子指标为自变量,计算了番茄茎流流速的通径系数、相关系数、决定系数、相关度和对回归方程估测可靠程度R2的总贡献。结果表明:影响番茄茎流最大的环境因子是太阳辐射,其次是气温和饱和水汽压差,直接通径系数与关联度的计算结果基本一致,但各自变量对R2的总贡献同其与因变量的关联度稍有偏差。研究成果对南方避雨栽培条件下番茄优质高效生产具有重要指导意义。

Based on the experimental data of tomato under rain-shelter cultivation,the diurnal variation of stem sap flow velocity of tomato under the condition of different irrigation amount and weather was studied.Taking photosynthesis available radiation,solar radiation,air saturation vapor pressure,air relative humidity,air temperature and soil moisture content as independent variable,We calculated the coefficient of determination and correlation,and the overall contribution of the reliability of the regression equation of the independent variables on the stem sap of tomato.The results showed that the most sensitive indicator affecting the stem sap of tomato was solar radiation.The next two indicators were air temperature and air saturation vapor pressure.Direct path coefficient was basically consistent with correlation results,but variable factors on the result of the total contribution R2 have slight deviation compared to its correlation with the dependent variable.The research has important theoretical significance to promote tomato quality and efficient production under the condition of rain-shelter cultivation.