Drought analysis during growth season of winter wheat in piedmont region of Taihang Mountain——A case study at Baoding city

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.