关键词: 水分生产效率, 水分生产效率

Abstract: Based on the 1961- 2011 precipitation data from 20 meteorological stations in the Guangxi Province, and used the methods of climatic linear regression, Morlet wavelet analysis and Mann-Kendall rank analysis and R/S, the authors analyzed the spatiotemporal variation characteristics of different levels of precipitation and its change tends in Guangxi. The results indicated that: (1) the annual precipitation in Guangxi presented different tendencies, drizzle rain, light rain and moderate rain had a significant increasing tendency, large rain had an unobvious decreasing tendency and storm rain had an unobvious increasing tendency; (2) it was also found that abrupt changes of different levels of precipitation displayed difference at the 0.05 level, the change of light rain was especially remarkable; (3) the results indicated that the spatial distributions of precipitation of different grades changed from east to west and from south to north, drizzle rain, light rain, moderate rain and large rain had shown declining tendency, but storm rain has shown increasing tendency; at the same time, it was found that difference existed in all meteorological stations that were consistent with the tendency of annual variation; (4) dued to the effects of different factors, different periodical variation was also displayed very clearly at the different levels of Precipitation in Guangxi province; (5) R/S analysis showed that the future variation tendency of different levels of precipitation was consistent with the past.