青藏高原湖区可鲁克湖富营养化评价——基于灰色聚类法

Eutrophication Evaluation of Keluke Lake Based on Grey Clustering Method

根据可鲁克湖2014-2015年水质测定数据,采用灰色聚类分析方法,选用总氮、总磷、氨氮、透明度、化学需氧量、叶绿素a、溶解氧作为聚类指标,对可鲁克湖水质富营养化进行评价,结果表明:可鲁克湖特征性污染物主要为TN、COD和NH3-N.2014TN浓度的平均值为1.11mg/L,属于地表水Ⅵ类水质,2015年为1.54mg/L,属于地表水Ⅴ类标准,表明总氮呈现增加趋势.COD在2014年平均值为17.92mg/L,2015年平均值为18.19mg/L,两年均属于地表水Ⅲ类.NH3-N在2014年平均值为0.22mg/L,属于地表水Ⅱ类,2015年NH3-N浓度平均值为0.69mg/L,属于地表水Ⅲ类标准.可鲁克湖水质BOD5、CODmn和TP指标在两年均优于Ⅱ类水质.灰色聚类评价显示可鲁克湖处于中富营养状态,并且有向富营养化状态转化的趋势,TP是可鲁克湖营养化限制因子.

Based on the on-site water quality data of Keluke lake during 2014-2015,TN,TP,NH3-N,SD,COD,Chla,and DO were selected for evaluating eutrophication of the lake by use of grey clustering method.The results showed that：（1）TN,NH3-N and COD were the most important factors of water quality of Keluke Lake.The average value of TN,COD and NH3-N in 2014 were 1.11mg/L,0.22mg/L,and 18.19mg/L,which attained the standards f or GradeⅥ,GradeⅡ,and GradeⅢof surface water quality,respectively.The average value of TN,COD and NH3-N in 2015 were 1.54mg/L,0.69mg/L,and 17.92mg/L,which attained the standards for Grade Ⅴ,Grade Ⅲ,and Grade Ⅲ of surface water quality,respectively.（2）The water quality of Keluke lake was upper-mesotrophic,and showed a trend that change to entrophic level.