蚕场柞树阶梯树型的养成,要选择土质较好,坡度较小,柞墩较大的无干蚕场进行。当根刈柞树生长5—6年该轮伐更新时(如图1),在休眠期,每墩只选留1个较大而又向墩外开张的植株,留干高100—150厘米,并保留较好的发芽部位。于其节杈上边进行高刈。每亩留高干不宜过多,以80林为宜。也可先多留些,翌年再淘汰间伐去。所留高干要分散均匀,布局合理。高干顶端如有适宜放留拐杖的侧枝,也可截留20—40厘米长的拐枝3—5个。截留拐杖也要保留较好的发芽部位,于其节杈上边剪去上梢。同 Silkworm oak tree ladder to form the tree, to choose a better soil, the slope is smaller, dry larger oak pier dry silkworm field. When the roots of oak trees grow 5-6 years of rotation when the update (Figure 1), in the dormant period, each pier only choose to leave a larger but open to the pier outside the plant, stay high 100-150 cm, And retain a better germination site. On its knuckles on the high mow. Stay high dry per mu should not be too much to 80 forest is appropriate. Can also be some more, then eliminate the thinning to the following year. Stay high to be evenly dispersed, the layout is reasonable. If the top tip of cadastral crutch sticky sideways, but also cut off 20-40 cm long turnip 3-5. Retention of crutches should also retain a good germination site, cut on the top of its twigs on the shoot. with