环境因子对苹果树水势的影响及其日变化规律

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 Effect of Environmental Factors on Water Potential of Apple Trees and its Diurnal Change Laws

Branch,leaf and fruit water potential of different grafting Starking and Golden Delicious apple trees growing in field were measured,and the GM(0,4) model of diurnal change laws of apple tree water potential with environmental factors was established by means of grey system theory.The results indicate:diurnal changes of apple tree water potential is higher in the early morning and comes down to the lowest at noon and goes up again to the highest level in the evening.Among the environmental factors that affect the water potential of apple trees during the day.temperature,relative humidity and irradiance are primary factors.The progressive resultant time sequence of water potential in different organs of apple trees and the that of temperature,relative humidity and irradiance have the relations of linear function.