Yan an is one of the areas in which the soil erosion is most serious on the loess plateau.Rainfall erosivity in Yan an area was estimated by the method of a simple model based on daily rainfall amounts using daily rainfall amounts data from 1951 to 2005 of Yan an weather stations.The results showed that the monthly rainfall erosivity mainly concentrated from June to September;the rainfall erosivity of this period is 85.6% of annual rainfall erosivity.The annual average value of rainfall erosivity was 1 765....
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