A Study on the Nutrition Status Evaluation and Algal Limiting Factor in Lake Changdang the Last 15-years

Use integrated nutrition state index,time series analysis,case analysis to analyze nitrogen,phosphorus,chlorophyll-a and other monitoring data and study the water quality,nutrients and the spatial and temporal distribution and variation of the type of nutrient limitation of Changdang Lake.The results showed that the trend of eutrophication has increased,the transparency of the past 15 years showed a downward trend,annual chlorophyll levels were rising in 5.5 mg/L;the water quality of Changdang Lake eastern outlet was better than the body area;TP was the limiting factor of algae for Changdang Lake.