星云湖水质季节性变化及成因分析

Analysis of Seasonal Variation and Causes of Water Quality in Xingyun Lake

为了解星云湖水质旱雨季变化特征及原因,采用综合营养状态指数法和综合污染指数法分析了星云湖水质季节性变化规律,并利用Spearman模型对星云湖综合营养状态指数、综合污染指数和水位、水温进行了相关性分析。结果发现,星云湖入湖河流综合污染指数的旱雨季变化与湖体变化情况一致,即雨季污染高于旱季;湖体水温与综合营养指数及综合污染指数显著正相关,湖体水位与综合营养指数在2019年表现为显著负相关。得出结论:星云湖雨季水质普遍劣于旱季,其原因是受入湖河流污染输入、水温上升、水位下降等因素的影响。并提出加强源头治污、保证生态流量、实施内源污染治理等建议,为未来星云湖水质持续提升提供参考。

In order to understand the characteristics and causes of water quality change in Xingyun Lake during the dry and rainy seasons,the paper analyzed the seasonal variation of water quality in Xingyun Lake by comprehensive nutrient state index and comprehensive pollution index,and analyzed the correlation between comprehensive nutrient state index,comprehensive pollutionindex and water level and water temperature of Xingyun Lake by Spearman model.The results showed that the variation of the comprehensive pollution index in the dry and rainy season were consistent with the changes of the Xingyun Lake body,that is,the pollution in the rainy season was higher than that in the dry season.Lake water temperature was significantly positively correlated with the comprehensive nutrition index and comprehensive pollution index,while lake water level was significantly negatively correlated with the comprehensive nutrition index in 2019.It is concluded that the water quality of Xingyun Lake in rainy season is generally worse than that in dry season,which is influenced by the pollution input of rivers into the lake,the rise of water temperatureand the fall of water level.Suggestions were put forward to strengthen pollution control at the source,ensure ecological flow,and implement internal pollution control,so as to provide reference for continuous improvement of water quality of Xingyun Lake in the future.