Research On Riparian Vegetation Buffer Zone Of The Chaobaihe Upstream River Basin In Beijing

Non-point pollution has become the important factors of water pollution, receive attention from the world. This paper conduct ecological restoration and management of the river shore hosepipe by biological soil engineering measures. And it is meaningful to improve the quality of river ecological environment of Beijing, ensure water quality safety, and enhance the sustainable economic and social development.Taking the Chao-bai River as the research object, this paper conduct a field survey, river grading and section type partition.Buffer zones vegetation survey, soil physical properties investigation and section water determination on both sides of the side of the river; Sediment blocking benefit and N, P buffer benefit test in the light of riparian zone situation, analyses the benefit of different kinds of buffer belt.(1) According to DEM, the Chaobai River can be divided into 5 grades. The type of riparian zone can be divided into five categories:u-shaped+gentle slope, u-shaped+steep slope, u-shaped+steep candy, V-shaped+steep and floodplains type+gradual slope.(2) The layout of basin waterfront buffer zone of Chaobai River is comprehensive reasonable, but also has some problems:buffer zone discontinuous, the single plant kinds, Partial loss, etc.(3) The coastal soil fertility has certain disparity.The fertility in woodland with high coverage is higher.(4) From upstream to downstream, the N, P content shows ascendant trend. The change in upper middle is little, and lower middle water quality is bad.(5) Each buffer zone of Grass, shrub, grass and shrub have buffer block effect to the sediment and N, P pollutants, and with the increase of buffer zone width, its effect is obvious increasing. In buffer benefit, herb buffer zones≥Grass and shrub buffer zone≥shrub buffer zones...