The soil erodibility characteristics of four land use types in Yanqing County of Beijing City

such as agricultural land

Prunus armeniaca

Cupressacea

mixed forest of trees and shrubs

was studied by measuring and analyzing the characters of soil water-stable aggregates

organic matter content and the soil erodibility K value.The results showed that structural damage rate was followed in the order:agricultural land Prunus armeniaca > Cupressacea > mixed forest of trees and shrubs

and forestlands were significantly lower than agricultural land(p < 0.05).Soil organic matter content with the increase of soil depth has certain rising trend in the agricultural land

soil organic matter content with the increase of soil depth decreases in the forestlands.Different land use types have the K value differences

which was followed in the order:mixed forest of trees and shrubs< Cupressacea < Prunus armeniaca < agricultural land.The K value of surface soil (0-20 cm) was less than that of 20-40 cm deep soil

indicating that the soil resistance to erosion capacity was above the deep soil and it is important to protect the surface soil. The soil erodibility K value was closed related to the factors:such as soil clay content

organic matter content and soil water-stable aggregatest closely(p < 0.05).