**3. Vegetation restoration along the Qinghai-Tibet Railway**

The vast majority of areas where the Qinghai-Tibet Railway crosses are of grassland vegetation, mainly distributed from Xidatan to Yangbajing. The process of railway construction and operation greatly affects the grassland ecosystem along the route. The grassland ecosystem along the railway is aging and degraded. In addition, during the construction of the railway, engineering sites, such as borrow pits and roadbed slopes have a huge impact on the grassland ecosystem along the line. The research and development of vegetation restoration technologies for grasslands of different site types is imminent. Based on this, we screened suitable plant species for difficult sites such as degraded alpine grasslands, roadbed slopes, and borrow sites to establish a stable and healthy plant community [9, 10].
