Abstract: The number of aggregate fractal dimension and soil erodibility K index were used to study the characteristics of soil erodibility of various layers of soil after fire under different simulated rainfall conditions. The results showed that the content of soil organic matter in burned sites has the greatest influence on soil erodibility, and the restoration effect of burned sites determines the soil's water erosion resistance. Among them, the 0～5 cm soil layer of the burned plots 1, 2 and 3 maintained the K value below 0.031 under the three different treatments of FW, SW and WS, and compared with the 0～5 cm and 5～10 cm soil layers, the K value of the 10～20 cm soil layer under the three different treatments were significantly increased, and the 10～20 cm soil layer of the fired plots 1 and 2 had the lowest corrosion resistance. The overall soil erodibility K value of plot 3 and control plot 3' were relatively lower, and their corrosion resistance were relatively stronger.

Key words: pinus massoniana plantation, burned area, soil erodibility K value, Le Bissonnais method