油松是我省荒山造林的主要树种之一。目前,植苗造林主要是使用裸根苗。但在干旱山区或立地条件较差的山地,油松裸根苗造林却存在着成活率差的问题。进一步摸索提高油松裸根苗造林成活率和保存率的方法很有必要。近年来,笔者同楼观台实验林场职工,在油松植苗造林中,采用先年方穴整地、穴底植苗的方法,使大面积油松造林成活率提高到80%左右。现介绍如下:1.方穴整地:方穴在山坡上的布局同鱼鳞坑整地,唯形状有异,坑穴为上口40×40厘米、下底30×30厘米、深40厘米的方斗状(详见图)。穴下部保持20厘米厚的虚 Pinus tabulaeformis is one of the main tree species afforestation in the barren hills of our province. At present, planting seedlings mainly use bare root seedlings. However, in the arid mountainous areas or in poorly-isolated mountainous areas, there is a problem of poor survival rate in bare-rooted seedlings afforestation. It is necessary to further explore ways to improve survival rate and preservation rate of Pinus tabulaeformis seedlings. In recent years, the author with the floor Guantai experimental forest farm workers in pine plantation afforestation, the use of the first year of the site preparation of acupoints, the method of planting seedlings, large-area pine afforestation survival rate increased to about 80%. Are introduced as follows: 1. Square site preparation: the layout of the cave on the hillside with the scale pit site preparation, the only different shapes, pit for the mouth 40 × 40 cm, the bottom 30 × 30 cm, 40 cm deep square bucket Shape (see figure). The lower part of the hole to maintain 20 cm thick virtual