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应用灰色系统方法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、果实水势与环境因子的日变化关系分析表明：影响苹果树枝条、叶片、果实水势日变化的生态因子中，相对湿度、温度辐射照度是主要影响因子，且相对湿度和温度对苹果树水势的作用相对高于辐射照度；不同嫁接组合苹果树各器官水势日变化趋势一致，但其变化幅度不同。
The gray system method was used to analyze the diurnal variation of water potential and environmental factors of shoots, leaves and fruits of different grafted apple trees and golden crown in open field conditions. The results showed that: Among the ecological factors affecting the diurnal changes of water potential of apple tree branches, leaves and fruits, The irradiance of humidity and temperature is the main influence factor, and the effect of relative humidity and temperature on water potential of apple tree is relatively higher than that of irradiance. The diurnal variation trend of water potential of different organs of apple tree is the same, but the variation range is different.