油松(Pinus tabulaeformis Car-r.)是我国北方的重要用材树种之一。它适应性强,生长较快,是绿化荒山荒地、改善生态环境的先锋树种。油松在我国的天然分布很广,由东经103°20′～124°45′,北纬3l°00′～43°33′,达12个省(区),呈东北至西南走向。所以,油松受地理环境和自然条件的影响很大。为研究油松地理变异的规 Pinus tabulaeformis Car-r. Is one of the important timber species in northern China. It adapts well and grows fast. It is a vanguard tree species of green barren mountain wasteland and ecological environment improvement. The natural distribution of Pinus tabulaeformis in our country is very wide, reaching from northeast to southwest from east longitude 103 ° 20 ’to 124 ° 45’ and latitude 3 ° 00 ° ~ 43 ° 33 ’north, reaching 12 provinces (regions). Therefore, the pine is greatly affected by the geographical environment and natural conditions. To study the rules of Pinus tabulaeformis variation