巨尾桉二代萌芽更新林分密度调控技术研究

A Study on the Density Control of Second-generation Eucalyptus grandis × E. urophylla Stand by Sprout Regeneration

对巨尾桉二代萌芽更新保留不同萌芽条数即不同密度的林分生长、生物量及林分结构进行研究 ,结果表明 ,每伐桩保留 1～ 2株萌芽条的林分生长状况明显优于全留萌芽条的林分 ;提出保留适宜萌芽条数量、合理整理萌芽条的时间和方法等林分密度管理技术措施 ;综合考虑培育目标和立地条件 ,提出巨尾桉二代萌芽林分密度应以 1650～ 2 50 0株· hm-2 为宜。

The sprouting amount kept and the tree growth, biomass and stand structure of second-generation sprout regenerated Eucalyptus grandis × E. urophylla stand were studied. The results showed that the tree growth with keeping 1～2 sprouts for each stump was better than that keeping all sprouts. The authors put forward some technical measurements for controlling stand density such as keeping proper amount of sprouting, reasonably regulating sprouting time. Taking silviculture object and site condition into account, it is suggested the proper stand density of second-generation sprout regenerated E. grandis × E. urophylla should be 1 650～2 500 per hectare.