Analysis of Eutrophic Trend and Driving Factors for Fuxianhu Lake in Yunnan Province

Research and analyze the eutrophic trend and driving factors of Fuxianhu Lake during 2005 to 2013 using principal component analysis method based on factor analysis. Results showed that Fuxianhu Lake's water quality was in class I,but it was disturbed easily by environment conditions. Its eutrophic state was increased continually, and it showed the trend of decreasing from north and south bank to the centre of the lake. Four principal components,including the eutrophication index,object feature index, pH index and organic index were extracted from the water quality parameters of Fuxianhu Lake by the method of the PCA and factor analysis. Phosphorus nutrient, WT, pH and CODMn were the main driving factors for the principal components. All principal components had the different distribution trends in every direction for Fuxianhu Lake, and F1 represented most of the information. So we should strengthen the control of phosphorus nutrient for the Fuxianhu Lake's protection.