次生林冠下红松造林技术

Planting techniques of Pinus koraiensis under canopy of secondary forest

次生林冠下营造红松，应选择了阴坡、半阴坡的中下腹及缓坡、上层深厚、排水良好的地段，实行顶浆造林。栽植密度：郁闷度在 ０．４～０．６时， ２ ０００～３ ３００株／ｈｍ２；郁闭度０．３以下时，３３００～４４００株／ｈｍ２；０．６以上为１５００／ｈｍ２左右。幼林抚育要进行５ａ，造林１０ａ进行透光抚育代， ２０ ａ左右伐除上层阔叶树时，保留具有培育前途的阔叶幼树，从而形成高产稳产的阔叶红松林。

Planting Pinus koraiensis under the canopy of secondary forest should be carried out in the site of shade slope, middle and lower of slop and gently slop. There is deep soil with better drainage in these sites. The planting technique should be used in early spring. The planting density should be 2000-3300trees/hm2 at the crown closure of 0. 4-0. 6, 3300-4400trees/hm2 at the crown closure of 0. 3 and 1500trees/hm2 at above 0. 6 crown closure. The tending of young growth should carried out for five years ; the lighting of trees should be started after plantation ten years ; the upper layer of broad-leaf trees shoule be cut out at twenty years. Only the young broard leaf trees that have prospecitive value can be retained, thus the high yield and stable broard leaf Pinus koraiensis forest could be established.