Qingshui River Bridge in the Hoh Xil Mountains

In the core area of ??the Hoh Xil Nature Reserve at an altitude of nearly 4,600 meters, a beautiful "rainbow" flies in front of the Suonandajie Conservation Station. This is the longest railway bridge on the Qinghai-Tibet Railway - Qingshui River Extraordinary bridge. The entire bridge is 11.7 kilometers long and has 2,878 piers with a diameter of about 1.2 meters in the deep permafrost area. It is located in the permafrost section of the plateau, with a frozen soil thickness of more than 20 meters and a high ice content. This area is also an area where rare wild animals such as Tibetan antelopes and Tibetan wild ass migrate frequently. As an ecological bridge, the railway bridge ensures the free migration of wild animals.

Suonandajie Nature Conservation Station: Suonandajie Nature Conservation Station on the banks of the Qingshui River is located along the Qinghai-Tibet Railway, east of Hoh Xil, and 2,952 kilometers away from the Qinghai-Tibet Highway. It is backed by the Kunlun Mountains, with an altitude of more than 4,600 meters, and the average annual temperature is below zero. The national flag flutters over the ropeway station. Every wall and brick here embodies the hard work and sweat of environmental protection volunteers. In May 1996, the foundation stone of the Suonandajie Nature Protection Station, China's first private natural ecological environment protection station, was laid. Mr. Yang Xin, the president of the non-governmental environmental protection organization "Green River Environmental Protection Promotion Association", used the same indomitable spirit as the Yangtze River rafting that year. He raised money to buy building materials through the charity sale of the book "Soul of the Yangtze River" and recruited volunteers. Finally, in September 1997, Yuesonandajie Nature Reserve was established. The station serves as the forefront of anti-poaching in Hoh Xil and an ecological environment education base on the Qinghai-Tibet line. In 1998, with the funding of companies and environmentalists, the station added wind and photovoltaic power generation devices, high-altitude observation towers, multi-functional halls, Kitchen, bathroom and other facilities. Suonandajie Nature Reserve has the best configuration among all protection units in the entire Yangtze River source area. From "Ten Years in Hoh Xil" and some documentaries, we can see the difficulty of establishing the Sonamdajie Protection Station, as well as the sacrifices made by the warriors in the wilderness of Hoh Xil.

In January 2001, the volunteer mechanism of the Sonamdajie Nature Conservation Station was launched. Volunteers are recruited from all over the country every year, and they serve in batches at the Sonamdajie Nature Conservation Station for one month. Volunteers contribute to Hoh Xil by assisting the government’s anti-poaching operations, conducting wildlife surveys, promoting ecological and environmental protection, conducting environmental education and training for local residents, tourists and Qinghai-Tibet Railway builders, and assisting scientists in environmental inspections and other special activities. Contributed to the protection of the ecological environment. Completed reports such as the "Survey of Wildlife from Kunlun Pass to Wudaoliang" and "Recommendation on Base Selection for Qinghai-Tibet Railway Construction Units and Sectional Construction of Railway Construction", which played a key reference role for ecological protection during the construction of the Qinghai-Tibet Railway. .