More than 26,000 hectares of trees will be planted along the 700-kilometer Tibet section of the Qinghai-Tibet railway over the next five years.

The People's Liberation Army (PLA) and local volunteers have started the tree-planting project, which will stretch from Mt Tanggula to Lhasa, capital of Tibet.

The 1,956-km Qinghai-Tibet railway, which began service on July 1 last year, starts from Xining, capital of northwest China's Qinghai Province, and ends in Lhasa. It is the world's highest railway and the first railway ever to go to Tibet.