Driving Mechanisms of the Evolution and Ecological Water Demand of Hulun Lake in Inner Mongolia

Hulun Lake is located in the Buir Grassland Inner Mongolia and an important component of northern ecological barrier China. Fluctuations its area directly affect stability surrounding environments. In this study, was taken as study object, meteorological data, water body area, level, reservoir capacity, runoff volume, social statistical data were used to dynamic changes critical driving forces. We constructed a balance analysis equation, determined role groundwater cycle, examined minimum demand Lake. The results analyses revealed that during last 55 years, variation trends capacity generally consistent could be divided into six stages. increased temperature decreased precipitation, evaporation resulted flow from major rivers supplying lake, which main cause decrease level Groundwater involved cycle After deducting seepage surface drainage, we found recharge volume around 792 million m3 yearly. Based on environmental, ecological, production functions Lake, 11.272 billion m3.