摘要
对黄龙山辽东栎林设置未间伐(对照)、13.4%材积强度间伐后天然更新(弱度间伐)和30.0%材积强度间伐后人工补植油松(强度间伐)试验,研究不同强度近自然经营间伐措施对辽东栎林立地环境、群落物种多样性和优势林木更新的影响。结果表明:近自然经营后林地可利用养分增加,尤其是土壤全N含量;间伐样地物种多样性指数均高于未间伐样地;优势乔木(辽东栎、油松和茶条槭)幼苗幼树数量随间伐强度增大而增加;与对照相比,间伐样地幼苗幼树存活率高,高生长量增加;在黄土高原黄龙山林区,油松需要人工促进更新,而辽东栎和茶条槭均能够天然更新;近自然经营间伐措施能够促进辽东栎次生林立地环境改善,加快优势林木更新进程;间伐30.0%后人工补植油松更适合当地辽东栎次生林的抚育管理。
This study was conducted in Quercus wutaishanica forests in Huanglong mountains with two close-to-nature management measures of self-regeneration after thinning 13.4% (light thinning) and planting Pinus tabulaefomis saplings after thinning 30% (heavy thinning),as well as un-thinned control.Effects of different thinning intensities on the site conditions,species diversity and dominant tree species regeneration were investigated.The results showed that:after closeto-nature thinning,the available nutrients increased,especially the total nitrogen.The species diversity indices were higher in thinned forests than in the un-thinned forests.With the increase of thinning intensity,the amount of seedlings and saplings of the dominant arbors (e.g.,Q.wutaishanica,P.tabulaeformis,Acer ginnala) became greater.Compared with the control,the survival rate of the seedlings and saplings in thinned plots increased,and so did the current annual increment of height.In Huanglong Mountains,P.tabuliformis needs artificial measures for its regeneration,but Q.wutaishanica and A.ginnala can successfully self-regenerate.Close-to-nature thinning could improve the site conditions in Q.wutaishanica secondary forests and promote regeneration of the dominant tree species.Plantation of P.tabulaefomis saplings after thinning 30% of Q.wutaishanica stand was more suitable to the management of Q.wutaishanica secondary forest.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2013年第8期15-20,共6页
Scientia Silvae Sinicae
基金
中国科学院战略性先导科技专项(XDA05050203-05)
国家林业局林业公益性行业科研专项(201004011)
关键词
近自然经营
间伐
辽东栎林
更新
close-to-natural forest management
thinning
Quercus wutaishanica forest
regeneration