PRELIMINARY STUDY ON THE LAST 40 YEARS' CHANGE OF TEMPERATURE AND RAIN PRECIPITATION IN SHILIN BA-RIVER CATCHMENTS

Climatic change in river catchments is concerned worldwide.With base of the last 40 years'meteorological records,the changes of temperature and rain precipitation were discussed respectively monthly,seasonally and yearly by mathematical statistic way.The results show that increasing rate of annual temperature is 0.2℃/10a,nearly equal to one in Kunming City,but lower than the same period change nationwide.The increasing quantity of temperature in rainfall season(summer season) from May to October is higher than one in dry season(winter season) from November to nest April.In the past 40-years,annual rainfall increased totally by 40 mm.Rainfall in the rainfall season decreased slightly and one in the dry season increased by a little.The quantity of the first precipitation each year was more and the maximum rainfall of one day each year also increased,but continuous days of no rainfall increased by about 1.9 days.The fluctuation in rainfall is more than in temperature.Rainfall change is different from both worldwide and broad region.By dividing the studied years' meteorological data into different periods,different characters of temperature and precipitation change was found respectively in 1960s,1970s,1980s and 1990s.