采用盆栽1年生苹果梨幼苗作试材,研究水分胁迫对叶水势的影响。结果表明:一天中叶水势值与土壤水分状况密切相关,叶水势与土壤含水量呈正相关,回归方程为变形双曲线;当土壤含水量在9.5％以下时,随土壤含水量的下降叶水势迅速下降;当土壤含水量在9.5％以上时,随土壤含水量的下降叶水势变化不明显。保证梨幼树正常生长的土壤含水量应保持在9,5％以上。 The potted 1-year-old apple pear seedlings were used as materials to study the effect of water stress on leaf water potential. The results showed that the mid-day water potential was closely related to soil water status, the leaf water potential was positively correlated with soil moisture, and the regression equation was hyperbola. When the soil water content was below 9.5%, the leaf water potential decreased rapidly with the decrease of soil water content When the soil water content is above 9.5%, the change of leaf water potential is not obvious with the decrease of soil water content. Soil moisture to ensure the normal growth of young saplings should be maintained at 9,5%.