title: [Mechanism of contour hedgerow's control for non-point pollution in the semiarid region in northwest Hebei Province].
abstract: Slope nutrient loss is an important type of non-point pollution. The mechanism of non-point pollution control by using plenty of natural observed data in Hilly Loess region in Northwest Hebei Province, as well as combating with the large-scale artificial simulation rainfall in the field slope was analyzed. The study results show that the critical slope length was 10-15 m on the condition of rainstorm, which led to the generation of rill and made the erosion amount went up obviously. The study show that the nutrient loss in sediment was the main type of non-point pollution, the contour hedgerow the process of non-point pollution by controlling the nutrient loss in sediment, then the study got the erosion control model of the contour hedgerow.
authors.affiliation: Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China. tangzh@igsnrr.ac.cn
authors.forename: Z
authors.initials: Z
authors.lastname: Tang
authors.forename: Q
authors.initials: Q
authors.lastname: Cai
authors.forename: F
authors.initials: F
authors.lastname: Xu
authors.forename: S
authors.initials: S
authors.lastname: Li
authors.forename: Z
authors.initials: Z
authors.lastname: Wang
mesh_terms: D002681:China; D004787:Environmental Pollution / Q000517:prevention & control*; D019015:Geologic Sediments; D008962:Models, Theoretical; D010944:Plants; D011891:Rain; D012987:Soil
chemical_list: D012987:Soil