Eutrophication and distribution characteristics of chlorophyll a,nitrogen and phosphorus in Aojiang River System,Wenzhou City
In order to explore the characteristics of nitrogen and phosphorus pollution in Aojiang River System of Wenzhou City,17 sampling sections were selected,and water samples were collected twice in January 2022 and June 2022.The spatial and temporal distribution characteristics of physical and chemical indexes,nitrogen and phosphorus concentrations and chlorophyll a(Chl-a)in Aojiang River System were studied.Grey correlation analysis was used to distinguish the correlation between physical and chemical indexes,nitrogen and phosphorus and Chl-a.At the same time,nitrogen and phosphorus ratio was used to determine the limiting factors of eutrophication in Aojiang River System and the eutrophication degree of Aojiang River System.The results showed that the concentration of Chl-a,nitrogen and phosphorus were different in time and space.According to the grey correlation degree,TN,DIN and ammonia nitrogen were the main influencing factors of Chl-a in Aojiang River System in dry season,while ammonia nitrogen,DTP and SRP were the main influencing factors of Chl-a in wet season.In Aojiang River System,nitrogen phosphorus ratio mainly showed a phosphorus limited state in wet season,and nitrogen-phosphorus limited state in dry season.The eutrophication evaluation results of Aojiang River System showed that the eutrophication was more serious in wet season,and the lower reaches were more serious than the upper reaches.
Aojiang River Systemnitrogenphosphoruschlorophyll anitrogen phosphorus ratioeutrophication
万方数据
维普
