保阔栽针的试验研究

An Experimental Study on Planting Conifers in Conserved Broad-leaf Trees

在人促阔叶林中营造的小块状人工杉木林生长快、蓄积量高、材质好，单位面积蓄积量达４９６ｍ３／ｈｍ２，年平均蓄积生长量达１８．４ｍ３／（ｈｍ２·ａ）；小块状人工杉木林下更新的阔叶林幼树密度达５２６５株／ｈｍ２，能满足天然更新要求，林分皆伐后可天然更新恢复成常绿阔叶林；人促阔叶林中小块状的人工杉木林的面积在１ｈｍ２内为宜，若带状其带宽在１００ｍ内为宜；在人促阔叶林中小块状或带状营造人工针叶林，这种＂保阔栽针＂方式是天然阔叶林经营利用的又一重要对策．

The main results of 27 years' experimental study are as follows:(1) The Chinese fir stand in small group,which is planted in broad-leaf stand whose natural regeneration is artificially stimulated,is fastgrowing and high-yield stand,with the stock being 496 m￣3/hm￣2,the average annual increment of volume 18. 4m￣3. hm￣(-2)·a￣(-1); (2) The density of the broad-leaf saplings is 5265 trees/hm￣2,and the Chinese fir stand in small group can be returned to ever-green stand after it is clear cut; (3) Considering the conditions of matural regeneration,the area of Chinese fir stand must be smaller than 1 hm￣2 in group or 100m in band; (4) The method of conserving broad-leaf trees and planting conifers is more important countermeasure for management of the natural broad-leaf forest.