由于近年来树种的混交和配置原则有所改变,因此,造林初植密度问题需要有营林和经济方面的依据。不久前曾有人认为,营造密植林分可加速树冠郁闭(对较差的立地条件更为重要),降低土壤管理费用,以及防止五月金龟子幼虫和扁椿象的危害。这时,通常不考虑采用综合机械化的可能性,今后整地和森林抚育的必要性。因此,在松林和混交松林中,比如说,每公顷栽植了13,000—20,000株树苗,行距宽通常为1.25—1.5米,甚至1米。 Due to the change of the tree planting and distribution principles in recent years, planting density needs to be based on silviculture and economic aspects. Not so long ago it was believed that planting close-knit forests accelerated canopy closure (which was more important for poorer site conditions), reduced soil management costs and prevented damage to May chafer larvae and stinkbugs. At this time, the possibility of adopting integrated mechanization and the necessity of site preparation and forest tending are not usually taken into account. Therefore, in pine forests and mixed pine forests, for example, 13,000-20,000 saplings are planted per hectare and the row spacing is usually 1.25-1.5 meters or even 1 meter.