In order to analyze the influences of land surface slope on runoff and concentration and solute transport

the total infiltration amount

the average of overland flow velocity

surface runoff and the changes of Br-

NH4+

and NO3-concentrations in surface runoff were studied in indoor soil tank experiment under artificial rainfall simulation. Three slopes (5°

10°

and 15°) and three rainfall intensities (30

60 and 120 mm/h ) are tested. Results show that with slope increasing

the average of overland flow velocity and the total amount of surface runoff are increased and the beginning time and termination time of surface runoff are advanced. The total infiltration amount is decreased with slope increasing. No obvious change in Br-concentration is observed and the course lines of Br-concentration in surface runoff are almost coincident. The NH+4 concentration appears a reducing trend and this trend becomes obvious with rainfall intensity increasing. Change of NO-3 concentration is not evident. The relationship between the averaged overland flow velocity and surface slope expressed by simple power function.