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| Characteristics of spatio-temporal differences of water pollutants in the Henan section of the Wei River basin |
| Received:May 17, 2021 |
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| KeyWord:Wei River basin;Henan;spatio-temporal difference;cluster analysis;discriminant analysis |
| Author Name | Affiliation | E-mail | | ZHANG Yan | Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, China
Laboratory of Quality and Safety Risk Assessment for Agro-Products on Water Environmental Factors, Ministry of Agriculture and Rural Affairs, Xinxiang 453002, China | | | ZOU Lei | Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | | | LI Ping | Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
Laboratory of Quality and Safety Risk Assessment for Agro-Products on Water Environmental Factors, Ministry of Agriculture and Rural Affairs, Xinxiang 453002, China | | | DOU Ming | School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, China
School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China | | | HUANG Zhongdong | Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China | | | LIANG Zhijie | Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
Laboratory of Quality and Safety Risk Assessment for Agro-Products on Water Environmental Factors, Ministry of Agriculture and Rural Affairs, Xinxiang 453002, China | | | QI Xuebin | Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
Laboratory of Quality and Safety Risk Assessment for Agro-Products on Water Environmental Factors, Ministry of Agriculture and Rural Affairs, Xinxiang 453002, China | qxb6301@sina.cn |
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| Abstract: |
| To reveal the spatiotemporal difference characteristics of water pollutants in the Henan section of the Wei River basin, the monitoring data of water pollutants COD, NH3-N, and TP from nine monitoring sections in the Wei River basin were collected, and the change trends, spatio-temporal distribution, and differences of water pollutants in different periods were analyzed using the Mann-Kendall test, Pettitt mutation test, cluster analysis, and discriminant analysis. The results showed that the water quality was relatively poor in the main stream of the Wei River, Communist canal, and Tang River, while those of the Qi River and Anyang River were relatively good. NH3-N was the main water pollutant in the Henan section of the Wei River basin. Most of the water pollutants in the monitoring sections showed a significant decreasing trend across different periods; the mutation times of COD and NH3-N were mostly concentrated in 2016 and 2017, whereas those of TP were mostly concentrated in 2017 and 2018. The proportion of COD and NH3-N in class Ⅳ and above water quality standards showed non-flood season > flood season, while TP showed flood season > non-flood season. The spatial clustering results of water pollutants were effective and relatively good in different periods: the fluctuations of COD concentration in Hebi Gengsi and TP concentration in Xunxian Qianfangcheng in different periods were small, while the fluctuations of COD and TP concentrations in the other monitoring sections were relatively large, and the fluctuations in NH3-N concentration in different monitoring sections in different periods had certain similarities. The water pollutants in the Henan section of the Wei River basin show obvious spatio-temporal differences. |
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