WP1130 The Qinghai ndash Tibet highway offers
Most of the area surrounding the Qinghai–Tibet highway has a well-preserved WP1130 in which the environment is extremely fragile and sensitive to outside influences (Yu and Lv, 2011). Even minor effects from human activities or climate change can lead to significant environmental damage (Klein et al., 2004). Apart from transportation, the environment in this region has few anthropogenic disturbances (Yan et al., 2013). The rapid development of road traffic due to freight transport and increasing tourism is exerting increasing pressure on roadside environments.