The effects of vegetation type

rainfall intensity

surface crust

and weed cover on rainfall infiltration and runoff on grassland and bare land were studied under simulated rainfall conditions. The results show that surface crust could easily take place on bare land

so its runoff-yielding time primarily depends on rainfall intensity

and their relationship might be described by a power function. However

runoff-yielding time on grassland with a higher cover ratio primarily depends on initial soil water content

and their relationship might be described by a linear function. Compared with bare land

grassland could delay and intercept runoff effectively. After surface curst was formed on bare land

runoff generation would be earlier and the average infiltration rate would be lower. However

bare land covered with weed

especially in the middle and bottom parts of the hillslope

would delay and intercept runoff

increase infiltrated water

and make soil water move deeper. Moreover

evaporation inhibition after rainfall also has the similar effects.