Abstract:

In order to know the status of Wuli Lake after several ecological projects being carried out, studies as follows were performed. The method of trophic state-comprehensive index was used to assess the ecosystem health of Wuli Lake in 2010. On this study, 15 sampling sites were determined, and the work of sampling was done once a month. After that, 4 indices including Chla, SD, TP and TN were chosen to calculate the trophic status index (TSI), and nondimensionalizated indicators such as physical indicators, chemical indicators and biological indicators were used to calculate comprehensive index to estimate the ecosystem health state. The results showed that the ecosystem health of Wuli Lake was the best on July and the worst on August in 2010, which was abnormal. Maybe it had something to do with the digging of cyanobacteria and the rainy weather at that time. And the deviation between TSI and CI was also detected, when TSI increased or decreased rapidly and passed through the threshold of grading standards of eutrophication.