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| DOI：10.13522/j.cnki.ggps.2017.0348 |
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| Using GIS to Analyze Spatial Distribution of Contaminants Emanating from Nonpoint Pollution Source in Niyang River Basin |
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HAO Shouning, ZONG Yongchen, DONG Fei
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Tibet Agriculture and Animal Husbandry College, Nyingchi 860000, China; China Institute of Water Resources and Hydropower Research, Beijing 100038, China
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| Abstract: |
| 【Objective】 Environmental pollution caused by contaminants emanating from nonpoint sources in agricultural fields is an increased concern and the purpose of this paper is to take Niyang River Basin as an example, analysing its pollution sources and contaminants spreading. 【Method】 Based on the origin of the pollutants, we divided their sources into three components: a domestic waste comportment, a fertilizer leaching compartment, and a livestock waste comportment. Using geographical information system (GIS) and statistical analysis of the agricultural data available in 2015, we examined the spatiotemporal variation of COD, total phosphorus, total nitrogen and ammonium in the basin. 【Result】 Pollution caused by the four contaminants was the most serious in the left control unit at the midstream, as well as the right and left control units at the downstream in the basin. Leaking from livestock waste was the key pollutant source. 【Conclusion】 Remediation aimed at ameliorating the nonpoint pollution should focus on the left sides at the midstream of the basin by reducing the leaking of the livestock wastes |
| Key words: output-coefficient method; agricultural non-point source pollution；GIS；Niyang River；distribution characteristics |
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