2009-2021年高邮湖水质时空变化与驱动因素

Spatial-temporal changes and driving factors of water quality in Gaoyou Lake from 2009 to 2021

基于高邮湖2009—2021年7个主要水质参数长期监测数据,对其水质状况进行评价,并采用综合营养状态指数法(TLI)分析营养状态变化,应用Mann-Kendall(MK)检验分析水质指标变化趋势,通过相关性分析检验淮河来水、气候条件与水质指标之间的关系,揭示淮河来水和气候条件对其水环境的影响。结果表明,2009—2021年高邮湖TN、TP多年平均质量浓度为1.01 mg/L和0.069 mg/L,整体变化趋势不明显;高邮湖处于轻度富营养状态(TLI=55.4),Chl-a平均质量浓度为14.80μg/L,低于湖泊可接受阈值20μg/L。相关性分析结果证明,高邮湖水质受淮河来水影响显著,此外气温、风速与湖体水质指标也呈现一定的相关性。

Based on the long-term monitoring data of seven main water quality parameters of Gaoyou Lake from 2009 to 2021,the water quality condition was evaluated,and the comprehensive trophic state index(TLI)method was used to analyze the changes of trophic state,and the Mann-Kendall(MK)test was applied to analyze the trends of water quality indicators,and the relationship between the incoming water,climatic conditions and water quality indicators was examined by correlation analysis to reveal the influence of the incoming water and climatic conditions of the Huai River on its water environment.The results show that the multi-year average concentrations of total nitrogen and total phosphorus in Gaoyou Lake from 2009 to 2021 are 1.01 mg/L and 0.069 mg/L,and the overall change trend is not obvious.Gaoyou Lake was in a mild eutrophic state(TLI=55.4),and the mean mass concentration of Chl-a was 14.80μg/L,which was below the acceptable threshold of 20μg/L for the lake.The results of correlation analysis prove that the water quality of Gaoyou Lake is significantly influenced by the incoming water of Huai River,in addition,the temperature and wind speed also show some correlation with the water quality index of the lake.