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本文通过对油松天然优良林分陕西省宁陕县十八丈沟试点８年生子代测定材料的统计分析来估算其遗传参数，并根据子代树高、地径、冠幅、当年高和轮枝数５性状的综合选择指数，对油松天然优良林分再次作出评价和选择。结果以５０％的入选率选出２０个遗传品质较好的优良林分，为今后母树林的经营管理和提高母树林的遗传增益提供了可信的依据
In this paper, the genetic parameters were estimated by statistical analysis of the 8-year-old pedigree test materials of natural provenance stands of Pinus tabulaeformis in Shibazhangou County, Shaanxi Province. According to the tree height, diameter, crown width, Turpentine 5 traits of the comprehensive selection index of the Pinus tabulaeformis natural superior stand again to make the evaluation and selection. Results A total of 20 excellent stands with good genetic quality were selected with 50% selection rate, which provided a credible basis for the management and improvement of the parental forest in the future