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在露地条件下对不同嫁接组合红星和金冠苹果树枝条、叶片及果实水势测试并应用灰色系统方法建立苹果树水势与环境因子日变化规律的GM (0 ,4)模型 ,结果表明 :苹果树各器官水势日变化均为早晨较高 ,午间或午后达最低值 ,傍晚回升到高于早晨的水平 ;温度、相对湿度和辐射照度是苹果树各器官水势日变化的主要影响因子 ,且不同嫁接组合苹果树各器官水势日变化的一次累加生成时间序列与温度、相对湿度及辐射照度日变化的一次累加生成时间序列呈线性函数关系
The GM (0, 4) model of diurnal variation of water potential and environmental factors in apple trees was established under open field conditions by testing the water potential of branches, leaves and fruits of different grafted red star and golden crown apple trees and applying gray system method. The results showed that: The diurnal changes of organ water potential were higher in morning, lowest in midday or afternoon, and higher in morning than in morning. Temperature, relative humidity and radiation irradiance were the main influencing factors of diurnal variation of water potential in various organs of apple tree, and different grafting combinations The cumulative time series of the changes of water potential in different organs of apple trees showed a linear function with the cumulative time series of temperature, relative humidity and daily variation of irradiance