At that time, fishermen could scoop a basin of water from the lake to cook fish. Wuliangsuhai is an important part of water conservancy project in Hetao irrigation area. It accepted more than 90% of farmland drainage in Hetao area. In fact, if it is only agricultural drainage, the pollution to Wuliangsuhai will not be great.
This is the largest freshwater lake in the Yellow River basin-Wuliangsuhai, which is known as the "Pearl beyond the Great Wall". In May 2008, yellow algae appeared in Wuliangsuhai Lake, covering an area of more than 80,000 mu for nearly five months, which covered the water surface in the core area and seriously polluted the water body, which attracted great attention from the leaders of the State Council.
May 20 12, I went to Wuliangsuhai again. Except for yellow algae, most of the water surface of Wuliangsuhai has been covered by reeds. The water quality in the whole lake area is black and smelly. According to the information provided by Bayannaoer Hetao Water Group. The water quality here is "inferior to five categories" all the year round, so you can't drink it, water it or even touch it with your skin.
In the core area of Gesar in Wuliangsuhai Wetland Waterfowl Nature Reserve, the area of yellow algae is large, covering almost the water surface on both sides of the highway. Xanthomonas is an algae plant that grows in wetlands. When the temperature is suitable and the eutrophication of water body intensifies, it grows and spreads rapidly, covering the water surface, which can cause fatal damage to aquatic plants, birds and fish.
Plastic bottles and countless dead fish are floating on the water. Many places are bubbling. Under the water depth of less than 1 m, perennial submerged plants such as potatoes flourish. The water is covered with yellow algae. Here reeds grow wildly, and even clumps of reeds are drilled between the planks of the scenic trestle. There are poisonous mosquitoes and flies everywhere on the embankment. Take a bite, and the swelling will not fade for a few days.