油松(Pinus tabulaeformis Carr·)是我国北方最主要的造林树种之一,特别是在干旱瘠薄的山地几乎是唯一的,目前还没有其他能够予以代替的先锋树种。每年各省区有数以百万亩计的广大荒山荒地采用油松进行绿化造林,取得了改造自然面貌的巨大成绩。但也必须指出,由于在育苗工作中对种子的来源与质量未加以应有的重视,大量的种子是从一些形态不良的、生长迟缓的母树上采来的,用了这样劣质的种子培育出来的苗木去造林,以致目前不少人工林分生长缓慢、干形弯曲,不能起到予期的生产用材的目的。 Pinus tabulaeformis Carr. Is one of the most important afforestation species in North China, especially in arid and barren mountains. There are no other pioneer tree species that can be replaced at present. Every year, a vast area of ​​barren hills and wilderness with millions of mu of land in various provinces and autonomous regions adopts pine for afforestation and has achieved great achievements in transforming the natural landscape. However, it must also be pointed out that due to the lack of attention paid to the origin and quality of seeds during seedling work, a large number of seeds have been picked from some poorly grown and slow-growing mother trees and have been raised with such poor seeds Of the seedlings to afforestation, resulting in a lot of artificial forest growth slowly, dry bending, can not play the purpose of the expected production timber.