淀山湖水质状况及富营养化评价

对2001年—2007年淀山湖水质监测结果进行了分析和评价。结果表明,淀山湖的水质均未达到Ⅱ类水质标准,主要超标项目为氨氮、TP、TN、石油类、IMn、COD和BOD5。综合营养状态指数为60.79～63.57,均处于中度富营养状态,chla与石油类和透明度具有很好的相关性,与TP具有较好的负相关性,与BOD5具有一定的负相关性,与水温、DO、IMn、COD、氨氮、TN的相关性不显著。chla季节变化较为明显。

Evaluation ofWater Quality and Eutrophication in D ianshan Lake

The monitoring data from 2001 to 2007 were analyzed to evaluate water quality in Dianshan Lake.The results indicated that the water quality of Dianshan Lake did not achieve water quality standards Ⅱ.The pollutants over standard value included ammonia nitrogen,TP,TN,petroleum,IMn,COD and BOD5.The comprehensive nutritional status indexes were from 60.79 to 63.57 to show the water quality at medium level of eutrophication.Statistical analysis of results shows a significant corelation between chla and petroleum,a significant corelation between chla and transparency,a negative correlation between chla and TP,a certain extent correlation between chla and BOD5.The relations did not been found between and water temperature DO,IMn,COD,ammonia nitrogen,total nitrogen.The seasonal variation of chla was obvious.