Abstract:By ten years field observation, this paper presents scale effects of runoff across two study scales on the controlled forestland and its comparative non forest land within Miyun reservoir basin. Results showed that the runoff rates of two land use logarithmically increase with the rainfall depth increased; the runoff rates of non forest land on the two scales are greater than those of forestland; furthermore, the difference of runoff rates between non forest lands and forestlands on the small watershed s...