淀山湖富营养化驱动力初探

通过2015—2019年在淀山湖布设5个采样点，监测总氮、总磷等12项水质指标，运用综合营养状态指数法和潜在性富营养化评价法对该水域富营养化水平进行分析，采用主成分分析法初步确定影响该水域富营养化水平的主要驱动因子。结果表明：监测期间淀山湖水质因子时空分布差异显著。综合营养状态指数法评价结果表明，淀山湖富营养化在轻—中度富营养化水平，并且季节变化规律明显；潜在性富营养化法评价结果表明，监测期间淀山湖以磷限制潜在性富营养为主。驱动因子分析表明硝酸盐氮是该水域富营养化最主要的驱动因子。

Analysis of Eutrophication Driving Force in Dianshan Lake

12 water quality indexes such as TN and TP, etc. from 5 sampling sites in Dianshan Lake were detected from 2015 to 2019, and the eutrophication level was analyzed by trophic level index (TLI) and potential eutrophication assessment. The main driving factors of eutrophication were determined by principal component analysis (PCA). The results showed that the spatial temporal distribution of water quality indexes had significant differences. The results of TLI indicated that Dianshan Lake was in mild to moderate eutrophication level and had obvious seasonal variation. The limitation of phosphorus in potential eutrophication was dominated in Dianshan Lake based on potential eutrophication assessment. Nitrate nitrogen was the main driving factor of eutrophication by driver analysis.