以水质综合污染指数、 化学需氧量、 氨氮和总磷浓度为评价指标,采用秩相关系数法分析练江水质变化趋势.结果表明2016-2017年练江水质综合污染指数和化学需氧量浓度呈显著的下降趋势,氨氮和总磷浓度呈不显著的下降趋势.2017年练江水质中化学需氧量、 氨氮和总磷浓度分别超过练江整治目标限值0.35倍、2.18倍和0.54倍.氨氮是练江水质超标最严重的污染物.建议重点控制练江流域的氨氮污染源.%Based on the comprehensive pollution index, chemical oxygen demand, ammonia nitrogen and total phosphorus concentration, the rank correlation coefficient method was used to analyze the change trend of water quality. Results showed that from 2016 to 2017 Lianjiang River's water quality comprehensive pollution index and chemical oxygen demand ( cod) concentrations were significantly decline, ammonia nitrogen and total phosphorus concentrations were not significant decline. In 2017, the concentration of chemical oxygen demand, ammonia nitrogen and total phosphorus in the Lianjiang River's water quality was 0. 35 times, 2. 18 times and 0. 54 times more than those of the river regulation target respectively. Ammonia nitrogen was the most serious pollutant in the water quality of the Lianjiang River. It was suggested that the pollution source of ammonia nitrogen in the Lianjiang River basin should be controlled.
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