Abstract:

According to the measured data from some meteorological and hydrological stations，and basing on the methods of mean value，linear trend and cumulative statistics from the equal，the temperature，precipitation，interannual and annual runof variations of Longchuanjiang River Basin during the past 50 years from 1960 to 2009 were statistically analysed．And non—parametric Mann-Kend—al test was used in significance test to examine the change trend of climate and hydrological factors．The results showed that the mean annual temperatures in the study area had risen，especially since the 1980s；and the warming of the low temperatures had significantly influenced the mean annual temperatures．The results also showed that the mean annual precipitation in the area was rising obviously， especially significant in the 1 990s．The annual distribution of precipitation was regularly different according to seasons；and the annual distribution of runoff showed a weak decreasing．The study indicated that human activities were important factors in some meteorological and hydrological changes．

Key words:  Longehuanjiang River basin, temperature, precipitation, runoff, Mann—Kendall trend analysis