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油松是我省山地造林的主要树种,生长快,适应性强,是深受欢迎的优良用材树种。油松在漫长的系统发育过程中,由于遗传变异和自然选择,种内个体的形态特征出现了分离变异。选择具有优良性状的单株或群体,扩大繁殖,用于林业生产,是早日实现林木良种化加快林业发展的有效途径。为此,我们曾到我省燕山山地遵化县境内东陵林场(海拔225米)、兴隆县境内六里坪林场(海拔950米)、平泉县境内黄土梁子林场(海拔760米)、大窝铺林场(海拔1200米),重点对油松人工林进行了调查,共调查标准
Pinus tabulaeformis is the main afforestation species in our province, fast growth, adaptability, is a popular timber species. During the long system development of Pinus tabulaeformis, due to the genetic variation and natural selection, morphological characteristics of individuals within the species appeared segregation variation. The selection of individuals or groups with excellent traits to expand the breeding for forestry production is an effective way to achieve early seedling improvement and forestry development. For this reason, we went to Dongling Forest Farm (225 meters above sea level) in Zunhua County, Yanshan Mountains, Liuliping Forest Farm (950 meters above sea level) in Xinglong County, Loess Liangzai Forest Farm (760 meters above sea level) in Pingquan County, Forest farm (1200 meters above sea level), focusing on the Pinus tabulaeformis plantation survey, a total of survey standards