初植密度对杉木二代种子园良种生长的影响研究

Effects of Forestation Density on Growth of Superior Variety of the Second Generation Seed Orchard in Cunninghamia lanceolata(Lamb.) Hook

以杉木二代种子园良种林分为研究对象,对比分析了3种初植密度对杉木平均生长量和蓄积量的影响。结果表明,8a生试验林平均树高、胸径、单株立木材积均值分别为6.52m、9.7㎝和0.030 89m3,年均生长量分别为0.81m、1.2㎝和0.003 86m3。不同初植密度对林分平均生长及蓄积量影响极显著,其中以选择3 086株/hm2的初植密度为最佳,可缩短林分郁闭周期,提早进行间伐,节约生产成本,实现杉木商品林小、中、大径材的可持续利用。

The effects of 3 forestation densities on growth were studied with superior variety generated by the second generation seed orchard of Cunninghamia Lanceolata. The result showed that the average of tree height, DHB and volume was 0.81m、1.2㎝ and 0.003 86m3,separately. And the annual growth of these traits were 0.81m、1.2㎝ and 0.003 86m3,separately. For growth and volume of per hectare, there were significant differences among 3 densities. The best density is 3 086 trees ＆#183; hm-2,it could be used for plantation,cutting the canopy cycle and the production costs.