油松是山西省造林的主要树种。它在国营造林的树种中占有绝大比重。营造上采用了栽植、直播与撒播等多种方式,但以直播的为最多,例如在1965年的油松造林中,直播的占70%以上。在油松直播造林的技术方法上,下种质量的好坏,即能不能掌握正确的下种技术操作方法,是造林成败的重要关键。如埋土的深浅,种子在播种点内的 Pinus tabulaeformis is the main tree species afforestation in Shanxi Province. It occupies a large proportion of the tree species in state-owned afforestation. On the construction of a variety of ways, such as planting, direct seeding and broadcasting, but the most direct live, for example, in 1965 pine afforestation, direct broadcast accounted for more than 70%. In Pinus tabulaeformis afforestation technical methods, the quality of the next species is good or bad, that can not grasp the correct operation of the next species of technology, is the key to the success or failure of afforestation. Such as the depth of the soil, the seeds in the sowing point