论文部分内容阅读
油松是我省山地造林的主要树种,它具有生长快、适应性强的特点。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,种内个体在形态特征上出现了多样性,选择出优良的变异性状,将具有这种优良性状的单株或群体,通过母树林和种子园的形式给以扩大繁殖,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
Pinus tabulaeformis is the main afforestation species in our province, which has the characteristics of fast growth and strong adaptability. Is a popular tree species of excellent timber. Due to the reasons of genetic variation and natural selection, Pinus tabulaeformis appeared diversity in the morphological characteristics during the long period of phylogeny, and selected the excellent variation traits. The individuals or groups with this excellent trait, It is an effective way to expand forestation and forestry production as early as possible through forest tree planting and seed garden in the form of expanding breeding for forestry production. To this end, we have to Yanshan Mountain in our province, Zunhua County, Dongling Forest Farm (225 meters above sea level), Xinglong County