title: [Estimation of N loss loading by runoff from paddy field during submersed period in Hangjiahu area].
abstract: As the largest bread basket in Zhejiang Province, Hangjiahu area is facing more and more serious water pollution, while the N loss loading by runoff from the paddy field during its submersed period is the main cause of the pollution. Through field experiment and fixed spot observation, the model of precipitation - runoff in Yangtze delta was testified, and the results showed that the precipitation - runoff model from HE Baogen was basically accorded with the fact after considering the impact of field overflow mouth, and the error was between - 19. 9% and + 18. 0%. The model of N concentration with precipitation - runoff in paddy field during submersed period was brought forward, with the R value being 0. 948. These two models consisted of the model of N loss loading by runoff from paddy field during submersed period. Based on this model as well as the past 30 years data of fertilization and precipitation, 1: 250,000 topography map, land use map, and water system map, the N loss loading and its distribution were estimated by using GIS method, and the results showed that the N loss loading was different from place to place, with an average of 35.26 kg N x hm(-2), and accounting for 12. 69% of the applied N. The N loss loading in Anji and Yuhang with obviously more precipitation was higher than that in other places, while Haining also had a serious N loss problem because of the huge amount of applied N.
authors.affiliation: Institute of Environmental Science and Technology, Zhejiang University, Hangzhou 310029, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Tian
authors.forename: Yingxu
authors.initials: Y
authors.lastname: Chen
authors.forename: Guangming
authors.initials: G
authors.lastname: Tian
authors.forename: Xinqiang
authors.initials: X
authors.lastname: Liang
authors.forename: Qiuling
authors.initials: Q
authors.lastname: Zhang
authors.forename: Qiaogang
authors.initials: Q
authors.lastname: Yu
authors.forename: Hua
authors.initials: H
authors.lastname: Li
mesh_terms: D002681:China; D005308:Fertilizers; D009584:Nitrogen / Q000032:analysis* / Q000378:metabolism; D012275:Oryza / Q000254:growth & development* / Q000378:metabolism; D011891:Rain; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D005308:Fertilizers; D014874:Water Pollutants, Chemical; D009584:Nitrogen