摘要
从林隙的形成方式、大小分布和形成木特征等几方面对缙云山森林林隙的形成特征进行了初步研究。结果表明 :缙云山森林林隙的形成方式以根拔、折干和枯立为主 ;林隙多由双形成木和三形成木形成 ,每个林隙平均形成木拥有量为 2 .88株 ;扩展林隙在 1 0 0～ 3 0 0m2 之间分布最多 ,冠空隙在 1 50m2 以下分布最多 ;扩展林隙直径与林隙高度比值“多分布在 0 6～ 1 4之间 ,冠空隙直径与林隙高度比值多分布在 0 2～ 0 8之间 ;林隙形成木以马尾松、四川山矾、四川大头茶、银木荷、黄杞和小叶栲为主 ,且其在径级达到 2 0～ 50cm、高度达到 1 5～2 5m时 ,最可能倒伏或枯立创建林隙 ;平均每株形成木所形成的扩展林隙面积为 76 8m2 ,形成的冠空隙面积为3 4 4m2 。
Forming characteristics of gap among the forest in Jinyun Mountain were preli minarily studied through the gap-forming manner, size distribution of gap and t h e characteristics of gap maker in the essay. The results show that the main ma nn ers of gap formation in the forest are uprooting, stem breakage and standing dea t h. Most of the gaps in the forest were formed by 2 or 3 gap makers, averagin g 2 . 88 trees per gap. The size of expanded gap (EG) and that of canopy gap (CG) centralize at 100～300 m\+2 and <150 m\+2, respectively; the ratio of the EG diameter vs. the gap height and that of the CG diameter vs. the gap height ce ntra lize at 0 6～1 4 and 0 2～0 8, respectively. Most of the gap makers are P inus massoniana, Symplocos setchuanensis, Gordonia acuminata, Schima argentea , Engelhardtia roxburghiana and Castanopsis carlesii var. spinulosa, and i t is most possible for them to creat gaps in the manner of treefall or standing death when they ar e 20～50 cm in D. B. H. and 15～25 m in height. The area of EG and CG forme d by one gap maker average 76 8 m\+2 and 34 4 m\+2, respectively.
出处
《西南师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2000年第3期305-309,共5页
Journal of Southwest China Normal University(Natural Science Edition)
基金
国家自然科学基金资助项目!( 3 95 70 13 0 )
