【摘要】 通过2014年—2017年对洪泽湖12个水质断面定期调查,采用营养状态指数(TLI)综合评价其水体富营养状态,同时应用主成分分析方法(PCA)分析其富营养化状态的时空变化特征。结果表明,洪泽湖70%以上的调查断面水质全年处于轻度富营养化状态,夏季是其富营养化最严重的季节;洪泽湖年内水体水质差异较大,而其水华特征并未呈现明显差异;洪泽湖富营养化很大程度上受制于营养盐的积累程度,并与湖泊透明度呈现极显著的负相关关系(p<0.001),与湖水pH值呈现极显著的正相关关系。更多还原

【Abstract】 Based on periodic investigation on 12 water quality monitoring sections in Hongze Lake during 2014—2017, the eutrophic state of water body was evaluated via trophic level index(TLI), and the temporal-spatial distribution characteristics of eutrophication was analyzed by principal component analysis method. Results showed that the water quality of over 70% monitoring sections was slightly eutrophication, and it was the most serious in summer. The water quality was quite different during a whole year in Hongze Lake, but the algal bloom was not. The eutrophication level in Hongze Lake greatly depended on the accumulation of nutritive salts. It had significant negative correlation with transparency(p<0.001)and significant positive correlation with pH value of the lake water.更多还原