Brief Study on Eutrophic Evaluation Method of Tingxi Reservoir in Xiamen

In order to evaluate water eutrophication reasonably,trophic level index(TLI),China′s eutrophic state index(TSIc) and revised Carlson index formula(TSIm) were used to assess the monitoring results of Tingxi reservoir in Xiamen from May 2008 to December 2009.The results showed that:1) the level of reservoir eutrophication in 2009 was higher than the same periods in 2008,and in 2009 the reservoir eutrophic indexes varied as wave;2) the eutrophic indexes varied in same trend,the value of TSIm was higher than TSIc and TLI,TLI and TSIc were much closer numerically.However,for the eutrophication level directed by eutrophic index,TSIm and TLI indicated more consistent eutrophication status.Therefore,when eutrophication level was low,the eutrophication statuses of water directed by TLI or TSIm were more consistent;while eutrophication level was higher,TSIm,TSIc or TLI could be chosen.