壤覆土要薄,墒情好的土壤应比墒情差的土壤覆土要薄,生活力弱的种子应比种子生活力强的种子要土壤覆土要薄。云杉是耐荫性树种,特别是幼苗阶段,需要一定的荫蔽条件,常用覆盖物有竹帘、草帘、遮荫网等材料覆盖,并保持床面湿润,当幼苗破土达20%后,用竹子(直径2cm左右)或其它材料将覆盖物顶起悬空,留出空隙勿使嫩芽受压损伤,当幼苗出齐后升棚遮荫。升棚遮荫法是指在出苗率达到80%后,沿苗床方向搭建遮荫棚。荫棚距地面高度 Loam soil should be thin, soil moisture good soil should be thinner than soil moisture soil cover, weak seed than seeds should be stronger than the soil to the soil cover soil should be thin. Spruce is shade-tolerant species, especially the seedling stage, need some shade conditions, common cover with bamboo curtain, straw curtain, shade net and other materials to cover and keep the bed wet, when the seedlings up to 20% With bamboo (diameter of about 2cm) or other materials will be covered from the top of the vacant, leaving the gaps do not make the bud pressure injury, when the seedlings altar or shade after shade. Ascending shading Shading refers to the emergence rate of 80%, the direction along the seedbed to build shade shed. Yin Yuen height from the ground