Effects of thinning intensities on population regeneration of natural Quercus variabilis forest on the south slope of Qinling Mountains
Taking the natural Quercus variabilis forest in Shangluo,south slope of Qinling Mountains as the object in May 2006 and August 2011,which was under close-to-natural management of different thinning intensities (30％,20％,10％),and the un-thinned forest as the control,changes of the stand growth situation before and after thinning,population regeneration,species diversity and soil fertility after 5 years of thinning were analyzed,and the effects of thinning on forestland revegetation and community development were evaluated comprehensively.The results showed that the number of 1-6 years old Q.variabilis seedlings increased with increasing thinning intensity,while no significant difference was found for above 6 years old seedlings.The regeneration potentials of population under 10％,20％ and 30％ thinning were respectively increased by 10.8％,28.5％ and 32.9％ compared with the control.Thinning promoted the DBH and crown of the trees and shrubs,as well as the height of shrubs,especially for light-loving plants,and the effect of promotion increased with increasing thinning intensity.The species diversity and soil fertility were improved after thinning,in order of 30％ ＞ 20％ ＞ 10％ ＞ control.The thinning intensity of 30％ (canopy density 0.6) was more conducive to the continuable development of the natural Q.variabilis forest in which canopy density was above 0.85.
国家科技期刊平台
NSTL
万方数据
维普
