【摘要】 采用国家地表水环境质量监测网2006-2015年的数据,对淮河流域近十年地表水主要减排指标化学需氧量和氨氮浓度的变化特征进行了初步分析。结果表明:淮河干流水质优于主要支流和沂沭泗水系。淮河干流和主要支流的化学需氧量年均浓度呈现波动变化,氨氮年均浓度则均呈现显著下降趋势;而沂沭泗水系的化学需氧量和氨氮年均浓度均呈现显著下降趋势。淮河干流、主要支流和沂沭泗水系的化学需氧量浓度年内变化和季节没有特别明显的相关性;氨氮浓度年内变化则呈现出相似的季节变化特征,丰水期浓度低于枯水期浓度。污染物排放量的逐年递减是淮河流域近十年地表水质改善的重要原因。更多还原

【Abstract】 Based on the data from 2006 to 2015 of surface water environmental quality monitoring network in China,chemical oxygen demand and ammonia nitrogen variation characteristic of Huaihe River Basin is analyzed in recent ten years. The quality of the main stream was better than the main tributaries and Yishusi river system. As for Huaihe river system,the annual mean value of chemical oxygen demand fluctuated in recent ten years,but the annual mean value of ammonia nitrogen significantly decreased. The annual mean value of chemical oxygen demand and ammonia nitrogen of Yishusi river system also significantly decreased. The concentration of chemical oxygen demand wasn’t affected by season. The concentration of ammonia nitrogen was higher in drought season than in wet season. The decrease of pollutant emission was the important reason for the improvement of surface water quality in the Huaihe River Basin in recent ten years.更多还原