Based on the meteorological data of 60 stations above the Bengbu Sluice of Huaihe River from 1961 to 2015, Crop Water Deficit Index (CWDI) and Relative Moisture Index (M) were calculated. Taking winter wheat drought as the representative of agricultural drought, the temporal and spatial characteristics of winter wheat drought and meteorological drought during growth period were analyzed. The duration, severity and frequency of 30 major drought events were identified through the run theory, and the correlation between agricultural drought and meteorological drought was studied. The results showed that: (1) In terms of time, the proportion of agricultural drought in winter wheat growth period was higher than that of meteorological drought, and the years with the largest interannual difference occurred in the pre-winter growth period; (2) In terms of space, the winter wheat drought and meteorological drought in the whole growth period and each growth period were distributed by zonal mode structure, and the drought gradually increases from south to north. More than 75% of the drought of winter wheat occurs from over-wintering period to filling and mature period, while meteorological drought only occurred during over-wintering period; (3) Winter wheat drought was delayed compared with meteorological drought, and its intensity was greater than meteorological drought; (4) When the duration of meteorological drought reached 1.28 dekad or the drought severity reached 3.35, the drought of winter wheat will be triggered, and the frequency of the duration and severity return period of winter wheat drought was greater than that of meteorological drought.

根据1961—2015年淮河蚌埠闸以上60个站点的气象资料，计算了作物缺水指数（CWDI）和相对水分指数（M）。以冬小麦干旱为代表的农业干旱,分析了生育期冬小麦干旱和气象干旱的时空特征。通过运行理论确定了30次重大干旱事件的持续时间、严重程度和频率，研究了农业干旱与气象干旱的相关性。结果表明：（1）从时间上看，冬小麦生育期农业干旱比重高于气象干旱，年际差异最大的年份出现在冬小麦生育前期；(2)从空间上看，整个生育期和各生育期的冬小麦干旱和气象干旱呈带状模式结构分布，干旱程度由南向北逐渐增加。冬小麦75%以上的干旱发生在越冬期到灌浆成熟期，而气象干旱只发生在越冬期；(3)冬小麦干旱较气象干旱滞后，强度大于气象干旱；(4)当气象干旱持续时间达到1.28 dekad或干旱严重度达到3.35时，将触发冬小麦干旱，且冬小麦干旱的持续时间和严重程度重现期的频率大于气象干旱。整个生育期和各生育期的冬小麦干旱和气象干旱呈带状模式结构分布，干旱程度由南向北逐渐增加。冬小麦75%以上的干旱发生在越冬期到灌浆成熟期，而气象干旱只发生在越冬期；(3)冬小麦干旱较气象干旱滞后，强度大于气象干旱；(4)当气象干旱持续时间达到1.28 dekad或干旱严重度达到3.35时，将触发冬小麦干旱，且冬小麦干旱的持续时间和严重程度重现期的频率大于气象干旱。整个生育期和各生育期的冬小麦干旱和气象干旱呈带状模式结构分布，干旱程度由南向北逐渐增加。冬小麦75%以上的干旱发生在越冬期到灌浆成熟期，而气象干旱只发生在越冬期；(3)冬小麦干旱较气象干旱滞后，强度大于气象干旱；(4)当气象干旱持续时间达到1.28 dekad或干旱严重度达到3.35时，将触发冬小麦干旱，且冬小麦干旱的持续时间和严重程度重现期的频率大于气象干旱。