Analysis of the Erosive Rainfall and Rainfall Erosion Energy on Red-soil Slopeland

Establishing rainfall standard of soil erosion,calculating rainfall erosion energy and analyzing their characteristics are important to the studies on rainfall erosivity and erosion prediction.However,these studies on red-soil slopeland are comparable less.By analyzing experiment data through the climate observation station and the bareness runoff plot during 5 years,the erosive rainfall standard on red-soil slopeland in Jiangxi province is established,and that is 9.97 mm and 0.756 mm/h.Then,the erosive rainfall and its energy are calculated and their distribution regulars in time are studied.It is shown that the number of erosive rainfall is only 25.82 percent during experimental period,but precipitation and rainfall intensity are higher.The erosive rainfall and rainfall erosion energy are variety in yearly,seasonal and monthly distribution,and all mainly distributes between April and September,accounting for 74.51% and 75.37% respectively among one year.Last,the equation of rainfall erosion energy and precipitation was induced for estimating evalues.This study is important to research the rainfall erosivity and establish soil loss equation in this region.