油松是东陵林场山地造林的主要树种,现有成林面积一万六千多亩。它具有生长快,材质好、造应性强的特点,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、变异和自然选择的原因,种内的不同个体形成了多样性,分化出来几个不同类型。将类型客观地划分出来,选择出优良类型和优良单株,发展采种母树林和种子园,是早日实现林木良种化,加快林业发展的有效途径。所以,我们在1977年对全场的油松人工林林分(即隆冬峪、硫璃厂、谢家营、小杏山等林区)进行了调查。调查方法:在林分内设标准地,每块 Pinus tabulaeformis is the main forest species in Dongling Forest Farm. The existing forest area is over 16,000 mu. It has the characteristics of fast growth, good material, strong adaptability, is a popular tree species of excellent timber. Pinus tabulaeformis in the long process of phylogeny, due to genetic, mutation and natural selection reasons, different individuals within the species formed a diversity of differentiation into several different types. It is an effective way to objectively divide the types, select the fine types and excellent single plants and develop the seed-planting mother trees and seed orchards. It is an effective way to realize the early seedling improvement and speed up the forestry development. Therefore, in 1977, we conducted a survey on the stands of Pinus tabulaeformis plantation (Longdongyu, Sulfur Factory, Xiejiaying, Xiaogan Mountain and other forest areas). Method of investigation: standard in the forest, each block