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| DOI：10.13522/j.cnki.ggps.2019227 |
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| Spatiotemporal Variation of Pollutants in Water Bodies from 2009 to 2017 in Henan Province |
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ZHANG Yan, LIANG Zhijie, LI Ping, DOU Ming, HUANG Zhongdong, QI Xuebin
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1.Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Xinxiang 453002,China; 2.Laboratory of Quality and Safety Risk Assessment for Agro‑Products on Water Environmental Factors, Ministry of Agriculture, Xinxiang 453002, China; 3. Key Laboratory of High-efficient and Safe Utilization of Agricultural Water Resources, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China; 4. School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, China
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| Abstract: |
| 【Objective】Managing and remediating aquatic ecosystems needs to understand the dynamics of pollutants in them, and the purpose of this paper is to analyze the spatiotemporal change in contaminants in water bodies across Henan province.【Method】Data measured in 2009—2017 from 36 stations across the province were analyzed. The temporal variation in pollutant concentrations at each station was statistically analyzed using the M-K test method, and the spatiotemporal similarity and difference in monthly-average concentration of COD and NH3-N across the province were calculated using the cluster analysis method.【Result】The maximum average concentrations of COD and NH3-N were at Liyuan Bridge in Wuyang county, and Banqiao in Sui county respectively, while the minimum average concentrations of both COD and NH3-N concentration were at Highway bridge in Yewu. Of the 36 stations, 66.67% and 61.67% had their average concentrations of COD and NH3-N exceed the class III Water Quality Standards, respectively. There were only nine stations where the average concentrations of COD and NH3-N reached or exceeded the Class III Water Quality Standards . It also found that 25 stations had seen their COD and 26 stations seen their NH3-N concentration declining steadily in 2009—2017, and only a few stations saw an opposite trend in their COD and NH3-N concentrations. There was an abrupt change in COD concentration at Luodeng Bridge in Yancheng county and Wuzhuang in Mianchi county, while for NH3-N concentration, there was an abrupt change at Luodeng Bridge in Yancheng county, Dongsunying in Luyi county and the Baisha reservoir. The pollutant concentrations measured from the 36 stations were spatiotemporally consistent, relatively high in February, March and May, and low from July to September, as well as in November and December.【Objective】Water pollution in Henan province was still high, although it has been improving, with pollutant concentration in all stations being spatiotemporal consistent. |
| Key words: Henan province; water pollutants; Spatiotemporal distribution characteristics; Mann-Kendall test method; Cluster analysis |
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