Study on Trophic Level and Correlation Analysis of Factors in Poyang Lake
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.
poyang lakeeutrophication evaluationnitrogen and phosphorusrelevance
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