关键词: 安徽淮北平原, 年降水量, 主汛期降水量, 暴雨日数

Abstract: Based on the precipitation data of six meteorological stations from 1957 to 2006 in Huaibei Plain of Anhui Province,the characteristics of variation of annual precipitation,three months precipitation from June to August and rainstorm days were analyzed by using statistical and trend fitting analysis method.The results showed that the increment of annual precipitation and precipitation during the flood period from June to August was not significant,but the inter-annual variations of these parameters were significant.The mean coefficient of variation for the annual precipitation was by 0.26.The difference between the maximum and the minimum annual precipitation was over 1150mm.The mean coefficient of variation of the precipitation during the flood period from June to August was with 0.39,while the ratio of the maximum and the minimum was with 5.07.Both rainy and rare rain years showed an increased trend since 1990s,same as for the rainstorm days.The floods and droughts were still the main factors which strained the local agricultural production.

Key words: Huaibei Plain of Anhui Province, Huaibei Plain of Anhui Province, Annual precipitation, Precipitation during the flood period from June to August, Rainstorm day