关键词: 安徽, 宽幅震荡, 降水集中化, 小波分析

Abstract: Based on daily precipitation data of sixteen meteorological stations in Anhui province during 1959 to 2007,using linear regression method，MannKendall method，accumulative anomaly method and Morlet wavelet analysis method,the characteristics and tendencies of annual precipitation variation were analyzed.The results showed that the trend of annual precipitation increased unsignificantly.The linear increase trend was significant in summer and winter,but decrease trend in spring and autumn were not obvious.There was a significant decrease trend for annual total rain days in all areas,but the heavy and rainstorm days was increased.The total rain day was reduced from south to north,but the change rates of ≥25mm rain day is increased from the same direction.Both annual precipitation and seasonal precipitation presented two kinds of period,and 2～4 years cycle concussion was obvious.In Anhui province,the precipitation was more centralized because of less rain days and more rainfalls.Since the mid 1990s,the annual precipitation presented more prominent wide range shock and uncertainly,resulted in more drought and flood disasters and bringing bad effect of the local agricultural production.

Key words: Anhui province, Wide range shock, Rainstorm days increased, Wavelet analysis