中文摘要：

以华北地区抗旱性不同的二冬麦品种石家庄8号（抗旱品种）与偃麦20（非抗旱品种）为材料,研究拔节期水分胁迫-复水补偿效应的品种差异及补偿效应对产量及水分利用效率（WUE）的影响。结果表明,在拔节期不同胁迫程度和不同胁迫历时下,石家庄8号水分胁迫-复水之后,各项生理指标均快速补偿,轻度水分胁迫-复水后出现超补偿效应,且出现超补偿效应后,WUE也高于对照;非抗旱品种偃麦20的耗水量、产量以及WUE受胁迫程度和胁迫历时的影响都很大,其复水之后的补偿效应也弱于石家庄8号,WUE也低于对照。从拔节期水分胁迫-复水补偿表现上看,对于华北地区的耐旱品种石家庄8号,在拔节期实施轻度的水分胁迫,有利于WUE的提高。

英文摘要：

Our objective was to investigate the compensatory effects of water stress and re-watering on varieties,yield and water use efficiency（WUE） in winter wheat cultivars ＇Shijiazhuang 8＇（drought resistant） and ＇Yanmai 20＇（drought sensitive） in North China during jointing stage.The results indicated that,the physiological indexes of the water resistant cultivar ＇Shijiazhuang 8＇ could compensate rapidly after re-watering.Compensatory effects or even extra compensatory effects could happen and WUE was higher than that of CK after mild water stress and re-watering.For drought sensitive cultivars ＇Yanmai 20＇,the effects of stress levels and stress time on water consumption,yield and WUE were great.Compensatory effects of ＇Yanmai 20＇ was lower than ＇Shijiazhuang 8＇.after re-watering.From the compensatory effects of water stress and re-watering,drought resistant cultivars ＇Shijiazhuang 8＇ in North China was under mild water stress during jointing stage,which is beneficial to yield WUE increased.