Ningxia sand lake: from bad V to Ⅲ type of ecological butterfly transformation

Since the beginning of this century, Ningxia Sand Lake scenic area due to the growth of tourists and other reasons, water pollution is becoming more and more serious, water quality once reached the inferior V. In 2016, the water quality of the sand lake was named by the Central Environmental Protection Inspection Group, ordered to rectify. Since then, Ningxia Nongken Group joint environmental protection departments, put forward the “external isolation, internal circulation, water body replacement, sewage relocation, ecological restoration, comprehensive management” of the governance ideas, and took a series of specific actions, such as the completion of the seepage isolation ditch and vegetation buffer zone, the construction of sand sedimentation tanks, siltation and expansion of the capacity to increase the planting of reeds and so on. By 2022, the water quality of Sand Lake has been improved year by year, from Class V to Class III, and the lake ecosystem has been gradually restored and biodiversity has been significantly enhanced, with the number of bird species increasing from 178 in 2011 to more than 210.