The Development And Application Of The Indicator Framwork Of Wuliangsuhai Eco-Environment System

A comprehensive indicator framework is developed for the eutrophication control of Wuliangsuhai lake in Inner Mongolia, the lake is a shallow grass lake located in arid area of western part of Inner Mongolia. The indicator framework is developed from the social economical indicator system, the indicator systems of lake geometry characteristics, physical and chemical factors and weather factors. In order to have less independent indicators, the principal component analysis is used to reduce the dimensions, the 14 indicators are summarized from 51 indicators that correlated with each other.The sensitivity analysis is performed for the indicator framework and the Wuliangsuhai eco-environment system. The most sensitivity indicators are agricultural production capacity, the production output of reed, the concentration of total phosphorus(TP), the temperature, which shows that the improvement of the eco-environment of Wuliangshai should considered the factors mentioned above. The grey correlation analysis is used to determine the importance of the factors. The threshold r>0.7 is used to determine the weight of the factors. The impact degree order is lake physical and chemical factors > weather factors > lake geometry characteristics > social economic factors.AHP combines quantity and quality indicators with expert judgment, the impact order of the factors are determined. The water environment carry capacity of Wuliangsuhai lake and weather factors are the most impactors, and the ecological environment water demand is analyzed with different methods.