Beijing, June 7 (Youth.cn) - Wuliangsu Lake located at the top of the "Ji" bend of the Yellow River is the largest lake wetland in the Yellow River basin. It is responsible for the important functions of the Yellow River water regulation, water purification, flood prevention and other important functions. It is the intersection area of multiple ecological functions in northern China and the natural ecological barrier to control the source of Beijing-Tianjin sandstorms.