Advance of Research for Splash Erosion

Splash is the first step of water erosion;it is the direct results of raindrop strike on soil;it is a process that raindrop kinetic energy is being reduced and the soil particles are being removed from here and there.Scholars researching the factors of rain splash from home and abroad focused on rainfall characters,soil characters and topography element,etc.The key factors for the raindrop splash include slope gradient,meteorology factors,plant coverage and structure of soil.Splash amount increased with rise of slope gradient,but it will decrease after the slope gradient more than a critical degree;increasing with higher intensity and larger diameter of rain drop.Surface plants could redistribute rain drop directly,which include cuting off flow,throughfall and trunk stream.If the thickness of surface covers is more than 1cm,the rain splash could be avoided.Different sizes of soil particles have specific anti-splash ability.The particles whoes diameters are around 0.15mm could be splashed most easily.Soil anti-splash ability could be improved with the increase of crust thickness.But most researches on the splash were done in simulation situation in laboratory,less under natural,and agricultural conditions.So splash researches should investigate into the patterns of rain splash under the condition of different crops,crop production approach and tillage styles in terms of the reality that slope farmlands cover a great part in some areas of China and achievments made by researches.