近26年大明湖水质变化趋势及富营养化特征

Water Quality Change Trend and Eutrophication Characteristics of Daming Lake in Recent 26 Years

基于1996~2021年大明湖长时间序列的水质监测数据,选取pH值、溶解氧、氨氮、总磷、总氮、高锰酸盐指数、化学需氧量、生化需氧量等8项指标,通过单因子污染指数法、改进的内梅罗指数法及综合营养状态指数法,分析了大明湖水质的变化趋势、富营养化特征。结果表明:1996~2021年,pH值保持稳定,溶解氧、总氮波动变化,其余指标浓度呈现先下降后保持稳定的趋势;近年来营养水平大致为轻度富营养化状态,还需加大水体富营养化治理力度。

Based on the long-time series water quality monitoring data of Daming Lake from 1996 to 2021,eight indicators including pH value,dissolved oxygen,ammonia nitrogen,total phosphorus,total nitrogen,permanganate index,chemical oxygen demand and biochemical oxygen demand are selected to analyze water quality change trend and eutrophication characteristics of Daming Lake through single factor pollution index method,improved Nemero index method and comprehensive nutritional status index method.The results showed that from 1996 to 2021,the pH value remained stable;the dissolved oxygen and total nitrogen fluctuated,and the concentration of other indicators decreased first and then remained stable;In recent years,the nutrition level is generally in the state of slight eutrophication,and it is necessary to strengthen the control of water eutrophication.