ANALYSIS OF RAINFALL EROSIVITY BASED ON THE DAILY PRECIPITATION IN GUANGDONG PROVINCE

Rainfall erosivity reflects the potential ability of soil erosion by the rainfall.In order to analyze the temporal change and spatial distribution of rainfall erosivity,the annual daily rainfall data from 26 meteorological stations in Guangdong province were used for computation.The result show that the spatial distribution of rainfall erosivity has the trend of decreasing from the coastal regions to the inland mountainous regions that is similar to the distribution of annual rainfall.The rainfall erosivity concentrates in rainy season(April to September),which contributes 84.8% of the year.Based on the temporal distribution,the rainfall erosivity can be distributed in 3 types(1;2;3) which are obviously different:(1) Distributing in inner mountainous regions of northern,northeastern,and northwestern;(2) Distributing in middle,eastern and western;(3) Distributing in Dianbai,Wucuan,and Leizhou Peninsula,which is in the south.The annual change of rainfall erosivity shows the positive trends in most parts of Guangdong between 1961～2001,which correlates to the rainfall and rainfall intensity.The max trend coefficient(r) is 0.326.