Spatial scale effects of runoff on the water resource conservation forest watershed within the Miyun reservoir basin
北京密云水库流域水源保护林区径流空间尺度效应的研究

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 scales are higher than those of plot scales; with the increase of spatial scales from plot to small watershed, the runoff rates of forestlands increased far less than those of non forest lands. Thus, contrasting with non forest land, the water resources conserving function of the water resource conservation forest is very evident.