Trophic State Evaluation in Water of Yao Lake

According to the data analysis of water quality monitoring indexs in Yao Lake from March 2010 to February 2011,fourteen monitoring points were classified into four kinds of areas with using Q-type clustering analysis method.On the basis of this,the trophic state of lake for whole and section was evaluated by comprehensive eutrophication state index(TLI) method.In time,the whole lake was under light eutropher throughout the year,and the eutrophication degree in summer and autumn was obviously higher than that in winter and spring;in space,the nutritious level distribution of the lake: southern part is serious,middle part is transitional and northern part is moderate.