不同林地清理方式对巨尾桉林地生产力的影响

Effect of Different Ground Clearance on Productivity of E.grandis×E.urophylla Forests

通过对不同林地清理方式的巨尾桉林分生长量、林下植被多样性和林地土壤理化性质的6a定位调查和研究,结果表明:炼山对巨尾桉林分早期树高生长(1～3a)有促进作用,但对3a后的生长量指标产生负效应,炼山后6年生巨尾桉林分的蓄积量和生物量低于不炼山林分;炼山不利于巨尾桉林下植被多样性和生态系统结构功能的稳定;炼山影响巨尾桉林分生长量的主要原因在于炼山导致林地土壤理化性质的恶化,降低土壤肥力,并进而影响林地的持续生产能力.从维护地力可持续发展的长期要求来看,应该尽快变革炼山这种传统的林地清理方式.

According to 6years located investigations , we examined the increment, growth course, diversity of understory vegetation and soil phychemical quality in Egrandis×Europhylla forest of different ground clearance The results were as follows: control burning could promote the growth of Egrandis×Europhylla forest during the first to the second year, but it would result in the negative effects from the third year , such as decreasing the volume and biomass of 6years forest, control burning was also reduced the diversity of understory vegetation and stability of ecosystems, control burning may cause the deterioration of soil phychemical quality and reduce soil fertility Above all, control burning as a conventional ground clearance sites in artifical afforestation practice of Egrandis×Europhylla forest should be altered for maintaining sustainable development of forested land 