长白山针阔混交林林木更新主要影响因素研究

基于14块针阔混交林固定样地的天然更新调查数据,针对影响天然更新效果的因素众多,仅用定性分析难以做出判断的特点,因此采用灰色系统中的关联度分析法,把影响天然更新的因素进行排序。排序结果依重要性分别是海拔高度、林木株数、郁闭度、腐殖质厚度、针叶树蓄积比重、蓄积量、针叶树株树、坡度。由于云冷杉等针叶树幼苗喜荫,不喜光,所以在采伐强度过大时将造成林内郁闭度降低,林内光照明显增强,进而严重影响云冷杉幼苗幼树的生长。因此,在实际生产中应慎重扩大采伐量,同时在采伐过程中尽可能减少对保留木的损伤,保证林分的天然更新。

Study of mostly effect factor of Natural Regeneration of Mixed Coniferous and Broadleaf in Northeast China

The study based on natural regeneration of 14 pemanent sample plots of mixed stands of coniferous and broad-leaved trees.This paper applies gray incidence theory to analyzing the influence factors of natural regeneration.The results of importance in demotion are altitude,tree number,crown density,thickness of humus,percentage of the volume of conifers,volume,number of conifers,gradient. Coniferous seedling of spruces and firs need appropriate shading to advance their growth.So in practice for a better natur...