次生林冠下红松造林技术

次生林冠下营造红松，应选择下阴坡、半阴坡的中下腹下缓坡、土层深厚、排水良好的地段，实行顶浆造林。栽植密度：郁闭度在0．4－0．6时，2000－3300株/hm^2，郁闭度0．3以下时，3300－4400株／hm^2；0．6以上为1500株／hm^2左右。幼林抚育要进行5a，造林10a进行透光抚育伐，20a左右伐除上层阔叶树时，保留具有培育前途的阔叶幼树，从而形成高稳产的阔叶红松林。

Planting techniques of Pinus koraiensis under canopy of secondary forest

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.