我国高寒林区,是国家木材生产的主要基地,这些林区的地理和气候条件是平均海拔高度较高,极限温差较大。以大兴安岭林区为例,其平均海拔高度为673m,极限温差达70～80℃,年平均气温为4.28℃,冬季长达7个月以上,素有“高寒禁区”之称。这种恶劣的自然地理条件,给采运机械生产,带来了很大困难。 China’s high-cold forest area is the main base of national timber production. The geographical and climatic conditions of these forest areas are higher average altitude and larger temperature difference. Taking the Greater Xing’an Mountains as an example, the average altitude is 673m, the ultimate temperature difference is 70-80 ℃, the annual average temperature is 4.28 ℃, and the winter is longer than 7 months. This harsh natural and geographical conditions, to the mining machinery production, brought great difficulties.