摘要
为掌握湘江流域永州段水环境质量发展趋势,加强湘江水资源保护,基于道县、祁阳、老埠头、双牌、渌埠头、南津渡和冷水滩断面2007—2019年高锰酸盐指数(COD_(Mn))、氨氮(NH_(3)-N)和总磷(TP)监测数据,采用spearman秩相关分析法研究其水质变化趋势,再通过滑动T检验法进行突变分析,识别了区域的污染因子、污染源、突变时间及前后变化量。结果表明:湘江流域永州段7个断面COD_(Mn)、NH_(3)-N和TP的浓度均能达到“GB 3838—2002,地表水环境质量标准”的IV类及以上标准限值,上游站点水质优于下游站点;所有断面COD_(Mn)浓度均呈显著下降趋势,除祁阳站外,其他6个断面的氨氮、总磷均呈显著上升趋势,氨氮、总磷是该地区的关键污染物,首要污染源为农业非点源污染,其次是生活源污染;各断面水质浓度的突变跳跃年份均集中2010年左右,突变跳跃月份集中在年度的枯水期(11月至次年4月),各站点TP浓度跳跃量<NH_(3)-N浓度跳跃量<COD_(Mn)浓度跳跃量。
In order to understand the development trend of water environment quality and strengthen the protection of water resources in the Yongzhou section of the Xiangjiang River Basin,based on the monitoring data of permanganate index(COD_(Mn)),ammonia nitrogen(NH_(3)-N)and total phosphorus(TP)of Daoxian,Qiyang,Laobutou,Shuangpai,Lubutou,Nanjingdu and Lengshuitan sections from 2007 to 2019,the spearman rank correlation analysis method was used to study the trend of its water quality,and then sliding T test method was used for mutation analysis to identify the regional pollution factors,pollution sources,mutation time and the amount of change before and after.The results showed that the concentrations of COD_(Mn),NH_(3)-N,and TP in 7 sections of the Yongzhou section of the Xiangjiang River Basin could all meet the Class IV and above standard limits of Environmental Quality Standards for Surface Water(GB-3838-2003),and the water quality of upstream sites was better than that of downstream site.The concentration of COD_(Mn) in all sections showed a significant downward trend.Except for Qiyang,the concentration of NH_(3)-N,and TP in the other six sections showed a significant upward trend.In these areas,NH_(3)-N and TP were their key pollutants and the primary source of pollution was agricultural non-point sources pollution,followed by domestic sources pollution.The sudden jump year of water quality concentration in each section was all concentrated in around 2010,and the month of sudden jump was concentrated in the annual dry season.The jump amount of water quality concentration at each site were in the order:TP<NH_(3)-N<COD_(Mn).
作者
武力
刘慧莹
向超
陈喆
王敦球
WULi;LIU Hui-ying;XIANG Chao;CHEN Zhe;WANG Dun-qiu(Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,College of Erwironmental Science and Engineering,Gu ilin University of Technology,Guilin 541004,PRC;Yongzhou Hydrology and Water Resources Investigation Bureau of Hunan Province,Yongzhou 425000,PRC;Environmental Protection Bureau of Yongzhou Economic and Technological Development Zone,Yongzhou 425000,PRC)
出处
《湖南农业科学》
2022年第2期72-76,80,共6页
Hunan Agricultural Sciences
基金
国家重点研发计划(2018YFD0800704)
国家自然科学基金(51638006)
广西自然科学基金(2018GXNSFBA138039)
桂林理工大学科研启动基金(GUTQDJJ2017015)
广西环境污染控制理论与技术重点实验室开放基金(桂科能1701K006)。
关键词
湘江
永州
水质
趋势
突变
Xiangjiang River
Yongzhou
water quality
trend
mutation
