CHARACTERISTICS OF PRECIPITATION IN CENTRAL REGION OF CHINA OVER45 YEARS

Based on daily precipitation data of 55meteorological stations in the central region of China in 1960～2005,method of trend analysis,spatial interpolation,wavelet analysis and mutation testing were used to obtain the temporal and spatial changes characteristics of precipitation.The results showed that:(1)the trend of annual precipitation is increasing at a climatic tendency of 18.6mm/10a,but the increasing trends of most sites are not significant;(2)there is no significant upward trend for annual precipitation days,and the increase rate is 0.57d/10a;(3)the increased rate of annual days of moderate rain,heavy rain and rainstorm are 0.39,0.22and 0.093d/10arespectively,and the number of sites is shrinking when the rainfall level improved;(4)precipitations in spring and autumn were decreasing in most of the areas,while precipitations in summer and winter were increasing,and the same as the precipitation days;(5)the oscillation periods of precipitation for year and seasons are not consistent,the annual and winter precipitation had abrupt change in 1989and 1982respectively,however the days of precipitation in summer and winter changed significantly in 1981and 1969respectively,all of which passed the reliability testing by 0.05.