鄱阳湖营养水平及关键因子相关性研究

Study on Trophic Level and Correlation Analysis of Factors in Poyang Lake

本文以位于江西省的淡水湖泊鄱阳湖为研究对象,通过监测2023年1∼10月全湖区的18个断面的8项水质因子,利用相关性分析,探讨了鄱阳湖全湖区富营养化的特征,以及叶绿素a和营养化关键指标的时空变化规律和两者之间的相关关系。结果表明:鄱阳湖2∼9月均处于富营养化状态,且富营养化比较严重。各湖区TN浓度月均值排序为:九江湖区>上饶湖区>南昌湖区;TP浓度月均值排序为:南昌湖区>九江湖区>上饶湖区;全湖区与透明度和pH相关性不显著;与总磷、高锰酸盐指数和水温呈正相关;叶绿素a与总氮呈负相关;磷可能是湖泊水体富营养化的营养限制因子。

This article takes Poyang Lake,a freshwater lake located in Jiangxi Province,as the research object.By monitoring 8 water quality factors in 18 sections of the entire lake area from January to October 2023,correlation analysis is used to explore the characteristics of eutrophication in the entire lake area of Poyang Lake,as well as the spatiotemporal changes of chlorophyll a and key indicators of eutrophication,and the correlation between the two.The results showed that the Poyang Lake was in eutrophication state from February to September,and eutrophication was relatively serious.The ranking of the monthly mean TN concentration in each lake area is as follows:Jiujiang Lake District>Shangrao Lake District>Nanchang Lake District;The monthly mean value of TP concentration was ranked as follows:Nanchang Lake District>Jiujiang Lake District>Shangrao Lake District;Chlorophyll a in Poyang Lake was negatively correlated with total nitrogen,but positively correlated with total phosphorus,permanganate index and water temperature.There was no significant correlation with transparency and pH.Phosphorus may be a nutrient limiting factor in the process of water eutrophication.