To provide a scientific basis regarding the effect of soil and water comprehensive control on runoff generation and its amount

the characteristics of infiltration in controlled and non-controlled watersheds of the Qinba hilly region were studied using the dual rings method and the parallel analysis.Results indicate that the infiltration rates of different landuses in controlled watersheds are obviously greater than that in non-controlled watershed.Steady-state infiltration rates in different landuses descend in the sequence of grassland

forest land

canal banks

slopping cultivated field

terrace and wasteland.Soil bulk density

soil organic matter content

the 0.25 mm water stable aggregates and soil porosity are the main causes for the increased infiltration rate.The increased infiltration rate by large-scale comprehensive control is one of the reasons for runoff generation process and variation of runoff amount.