摘要
乌鲁木齐河是我国西北干旱区典型内流河,也是乌鲁木齐市的重要水源地。为了解乌鲁木齐河上游水体化学需氧量(COD)在不同时间尺度的变化特征,在上游上、中、下段3个水质监测断面(跃进桥、英雄桥、青年渠)开展连续6年(2014—2019年)长期监测,每月测定1次水体COD。结果表明:各年份之间及各监测断面之间的COD均具有明显的月变化特征(2.0~13.0mg/L),但变化趋势各不相同;上游上段跃进桥COD(5.4mg/L)显著低于中段英雄桥(7.04mg/L)和下段青年渠(7.03mg/L);随时间(年)延长,各断面及其平均COD值呈显著下降趋势。总体而言,乌鲁木齐河上游水体COD低于《地表水环境质量标准》(GB3838—2002)一类标准限值(≤15mg/L),且呈逐年向好趋势。
The Urumqi River is a typical inland river in arid area of Northwest China,and it’s also an important water source of Urumqi city.In order to understand the variation characteristics of chemical oxygen demand(COD)in the up⁃per reaches of Urumqi River at different time scales,a long-term monitoring was carried out for six years(2014—2019)at three hydrological monitoring stations(i.e.,Yuejinqiao,Yingxiongqiao,and Qingnianqu,respectively)of up⁃per,middle,and lower sections,and the COD in water body was measured once a month.The results showed that the CODs showed obvious monthly variation characteristics(between 2.0~13.0mg/L)in different years and different moni⁃toring stations,but the change trends were different to each other.The COD(5.4mg/L)in Yuejinqiao in the upper sec⁃tion of upper-reaches of Urumqi River was significantly lower than that of Yingxiongqiao(7.04mg/L)and Qingnianqu(7.03mg/L)in the middle and lower sections.With the extension of time(year),the COD value in each of the three sta⁃tions and their average value both showed a significant decreasing trend.In general,the COD in water body in the up⁃per reaches of Urumqi River is lower than the national limit standard(≤15mg/L),and it is getting better year by year.
作者
吕湘芳
冷冰冰
刘燚
蒋焕
LV Xiangfang(Urumqi Environmental Monitoring Center Station,Urumqi 830099,China)
出处
《安徽农学通报》
2020年第19期129-132,共4页
Anhui Agricultural Science Bulletin
基金
新疆创新研究团队项目(Y843181)。