关键词: 降水量, 经验频率, 皮尔逊-Ⅲ型曲线, 五点平滑曲线, 气象干旱, 阜新地区

Abstract: Based on the precipitation data from 1953 to 2008 in Fuxin weather station and Zhangwu weather station, the time and frequency of drought were analyzed. The results indicate that the mean annual precipitation is 505 mm in Fuxin region, which can satisfy the needs of field crop water. The large differences of inter-annual precipitation and asymmetric distributions of precipitation within a year are main reasons of the drought. Summer precipitation is intensive and accounts for 67% of total annual precipitation, which can ensure the needs of field crop water in most years. Autumn drought often happens and precipitation is sparse from winter to spring sowing, so spring drought becomes frequent. Storing summer and autumn precipitation efficiently, improving field moisture infiltration and storage capacity by various measurements, inhibiting and decreasing the surface evaporation are better measurements for mitigating the effects from spring drought. On the other hand, annual precipitation takes on the periodic change in this region and decreases year after year, which may result in local drought disaster more frequent.