In order to determine the effects of red soil aggregate in different particle-size (<0.25

0.25～0.5

0.5～1

1～2

2～5 mm) on splash erosion

a simulated rainfall experiment (75 mm/h rain rate and 45 min rain time) was conducted. Aggregate breakdown

splash rates change

net splashed particles and splash spatial distribution were chosen to analyze the splash regulation. The results showed that: (1)2～5 mm aggregate breakdown rate was as high as 96.06%

while <2 mm was less than 50.00%. The index of breakdown rate significantly decreased with the aggregate size increasing. (2)The splash rates of <0.25 mm aggregate skyrocketed at first

and soon collapsed to 0.08 g/min. This phenomenon

in this period

might attributed to soil crust

which was developed rapidly and completely; The splash rates of 0.25～0.5 mm aggregate

which could be clearly observed to become muddy after 18 min rainfall

also skyrocketed at first

but then decreased slowly. The splash rates of 0.5～5 mm aggregate kept a long time increase and also decreased slowly after 36～42 min. (3)There were the same trends for the quantity of total splashed particles

in upslope and downslope area

net splashed particles among different size of aggregate. Splash erosion quantity within 0.25～0.5 mm was the maximum

and then gradually reduced with the particle size increasing. (4)Almost all of splashed aggregates spread in the scope of 60 cm

and the mean weight distance (MWS) of small aggregate was larger than those of the bigger one. This study provided a new approach to reveal the rainfall splash erosion mechanism of red soil

which had great significant for perfection of the physical progress model of rainfall erosion.