颍河干流阜阳段水质时空变化特征及影响分析

Temporal and spatial variation characteristics of water quality in Fuyang section of the main stream of Yinghe River and its impact analysis

根据2012—2021年颍河干流阜阳段3个水质代表性断面数据,选取氨氮、高锰酸盐指数、化学需氧量、总磷水质指标,采用综合污染指数法、季节性Kendall检验法、皮尔逊相关系数法,对颍河干流阜阳段进行水质变化特征和影响因素分析。结果表明,颍河干流阜阳段3个断面主要水质指标均呈高度显著下降趋势,水质综合情况有显著改善;上游断面综合污染指数高于下游断面;颍河干流阜阳段主要污染物从氨氮、高锰酸盐指数、化学需氧量逐渐转变为总磷,控制农业面源污染仍是颍河干流阜阳段改善水环境质量的重要任务。

According to the data of three water quality representative sections in Fuyang section of the main stream of Yinghe River from 2012 to 2021,ammonia nitrogen,permanganate index,chemical oxygen demand and total phosphorus water quality indicators were selected,and comprehensive pollution index method,seasonal Kendall test method and Pearson correlation coefficient method were used to analyze the water quality change characteristics and influencing factors of Fuyang section of the main stream of Yinghe River.The results show that the main water quality indexes of three sections in Fuyang section of the main stream of Yinghe River show a highly significant downward trend,and the comprehensive situation of water quality has been significantly improved.The comprehensive pollution index of upstream section is higher than that of downstream section.The main pollutants in Fuyang section of the main stream of Yinghe River gradually changed from ammonia nitrogen,permanganate index and chemical oxygen demand to total phosphorus.Controlling agricultural non-point source pollution is still an important task to improve water environment quality in Fuyang section of the main stream of Yinghe River.