| Cite this article: | 张巧玲,胡海棠.海河流域农田氮磷面源污染的空间分布特征及关键源区识别[J].灌溉排水学报,0,():-. |
| zhangqiaoling,huhaitang.海河流域农田氮磷面源污染的空间分布特征及关键源区识别[J].灌溉排水学报,0,():-. |
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| Spatial distribution of nitrogen and phosphorus from farmland non-point sources pollution and identification of critical source areas in the Haihe River Basin |
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zhangqiaoling1,2,3,4,2,3,5, huhaitang6
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1.Xi&2.amp;3.#39;4.&5.an university of science and technology;6.Beijing Research Center for Information Technology in Agriculture Beijing
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| Abstract: |
| 【Background】The Haihe River Basin is one of the most severely polluted river basins in China, and non-point source pollution from agriculture is an important souce.【Objective】In order to provide a theoretical basis for controlling the non-point source pollution in the Haihe River basin, this paper analyses the spatial characteristic of non-point sources pollution and the effect on water quality, and identifies the critical source areas of non-point pollution.【Method】Based on the InVEST model, the export load of nitrogen(N) and phosphorus (P) from farmland, the export of N and P flux at river section, and the potential runoff concentrations of N and P were calculated. GIS spatial hotspot analysis and hydrological network analysis methods were used to identify the critical source areas.【Result】(1) The export load of N and P was 2.41 mg/L, 0.56mg/L in 2015, the tatal export load of N and P were 3.4934 million tons and 0.8077 million tons. The average potential runoff concentrations of N and P was 5.97 mg/L, 1.47 mg/L, 55% rivers exceeded the Surface Water Class V Standard. (2) The export load of N and P from farmland were relatively low in the mountain areas while high in the middle plain regions. The spatial distribution of export load of N and P from farmland and potential runoff concentrations of N and P were different, the former mainly distributed in the Tuhaimajia River, Zhang Wei River and Ziya River systems, and the latter mainly distributed in the Tuhaimajia River, in the middle and lower reaches of Heilonggang River, the tributaries of Da Qing River and in upstream Ziya River systems. The potential runoff concentrations of N and P in upstream or the tributaries of basin were higher than main stream. (3) The hotspots area of N and P export load covered 14.45% and 16.02% respectively. The total export of N and P contribute 23.39% and 27.71%.【Conclusion】Non-point source pollution from farmland is more serious in the Haihe River Basin. The mountainous areas in the northwest are more polluted than the plains in the central and southern regions. The central and southern areas of the basin, the surrounding areas of Shijiazhuang and Qinhuangdao are the critical source areas. |
| Key words: hydrological network; InVEST model; non-point source pollution from farmland; the export load of N and P; critical source areas identification |
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