中文摘要：

对冬小麦生育期干旱进行精细分析,可以为农业生产和水资源管理提供参考信息,为降水、地下水动态以及作物耗水关系提供研究基础。采用有效降水和综合气象干旱指数（CI）方法,分析了太行山前平原冬小麦56个生育期及各生育阶段（苗期、越冬期、返青期、拔节~成熟期）的平均有效降水和气象干旱发生频率。研究发现冬小麦生育期平均有效降水为55.43 mm,分别占年有效降水和生育期降水量的13.6%和52.5%。其中,5月和10月是生育期有效降水的主要贡献月,平均有效降水量分别占到生育期有效降水量的35.7%、27.1%。生育期平均缺水350mm以上,并且有效降水的月际、年际间差异明显。逐月旱涝级别和频率分布显示,生育期干旱平均发生频率为58.5%,逐月发生干旱的频率均在50%以上。12月易发生轻旱,2、3月易发生中旱,4月易发生重旱。总体上,太行山前平原冬小麦生育期及各生育阶段的有效降水都表现出非稳定性,逐月平均有效降水量均不同程度小于需水量,干旱发生频率冬后大于冬前。

英文摘要：

A precise analysis of drought in growth season of winter wheat can provide reference information for agricultural production and management of water resources,and theoretical foundation for study the relationship between precipitation,groundwater dynamics and crop water consumption.In this paper,we analyzed average effective precipitation and meteorological drought frequency during growth season of winter wheat and each growing stage（seedling,wintering period,recovery,elongating~mature）,based on method of effective precipitation and meteorological drought composite index（CI）.The results showed average effective precipitation during growth season was 55.43 mm.The percentage of effective precipitation in annual effective precipitation and growth season precipitation was 13.6% and 52.5%,respectively.October and May were main contribution of monthly total effective precipitation,and represented 35.7% and 27.1% of average effective precipitation in growth season,respectively.The average water shortage during growth season was more than 350mm.Monthly and annual effective precipitations were significantly different.Based on grade and frequency of monthly CI,average drought frequency of growth season was 58.5% and monthly frequency was more than 50%.December was susceptible to mild drought,February and March were susceptible to moderate drought,and severe drought mostly was observed in April.Overall,average effective precipitations during growth season of winter wheat and each growing stage were inconsistent.At different level,they could not meet water need in the piedmont region of Taihang Mountain.Post-winter drought occurred more frequently than pre-winter drought.