[Characteristics of soil erosion on Karst slopes under artificial rainfall experiment conditions.].

Studying soil erosion process and mechanism on Karst slopes has important practical and guiding significance for controlling soil and water loss and preventing rocky desertification in Karst region. The soil erosion process and characteristics on Karst slopes were explored by artificial simulation rainfall experiment. Results showed that the soil and water loss largely came from underground hole (crack) when rainfall intensity was in the range of 30 and 50 mm·h, while soil erosion occurred primarily in soil surface when rainfall intensity was 80 mm·h. Surface runoff modulus and transport rate both increased with increasing slope, and decreased with increasing underground hole (crack) degree. The underground runoff modulus varied from 0.37 to 0.52, and the underground transport rate changed from 0.81 to 1.93 g·min. They both decreased with increasing slope while increased firstly and then decreased with increasing rainfall intensity.