在我国北方松属中,油松(Pinus tabu-laeformis Carr)是分布范围最广的森林树种。油松天然林分布在东经103°21′—124°45′,北纬31°—43°33′的区间。整个分布区呈长形,东北起自辽宁,沿河北、山西、陕西一线向四川的西部和甘肃南部方向延伸,跨十三省(市、自治区)的辽阔区域。垂直分布高差大,从海拔100米到2900米。晋、陕两省为集中分布区。山西素有“油松之乡”的美称,天然林几乎遍布全省,面积大、生长好。东部的太行 Pinus tabu-laeformis Carr is the most widely distributed forest species in China’s Pinus. Pinus tabulaeformis natural forests are distributed in the interval of longitude 103 ° 21’-124 ° 45 ’and latitude 31 ° -43 ° 33’. The whole area is long, northeast from Liaoning, along Hebei, Shanxi, Shaanxi line to the west of Sichuan and southern Gansu direction, across the thirteen provinces (municipalities and autonomous regions) of the vast area. Vertical distribution of large elevation, from 100 meters to 2900 meters above sea level. Shanxi and Shaanxi provinces focus on the distribution area. Shanxi known as “hometown of pine trees,” the reputation of natural forests almost all over the province, large area, good growth. Eastern Taihang