海南岛热带山地雨林林隙体系和阶段更新(英文)

Gap Regimes and Gap Phase Regeneration in a Tropical Montane Rain Forest of Hainan Island,South China

林隙是热带林生态系统中许多树种的重要更新生态位。论文运用精确的林隙构图调查方法分析海南岛热带山地雨林中林隙干扰体系、林隙阶段更新、树木物种多样性与林隙的关系。海南岛热带山地雨林中多数林隙由2～3个林隙形成木创造,林隙形成木主要来源于强风过后的折干和根拔。林隙周边树木成为林隙形成木的概率高于郁闭林中的冠层树木。扩展林隙和冠层林隙的平均面积分别为257和113m2,最大面积分别为540和353m2,最小面积分别为101和26m2。林隙面积显著影响幼苗和幼树的物种丰富度和密度,但大树没有影响。物种丰富度和香农-维纳多样性指数随林隙面积增加而提高,然而林隙中每m2的物种数量和单位个体的树种数量随林隙面积的增加而下降。

Gaps in tropical forest ecosystems are important regeneration niches for many tree species. Gap disturbance regimes, gap phase regeneration and tree species diversity in relation to gaps in a tropical montane rain forest of Hainan island were analyzed in this paper. The main results of this study were as follows ： 1 ） Most of the gaps were made by 2 - 3 gap makers, resulting from snapping and uprooting after strong winds ; 2） The gap surrounding trees （GST） had more probabilities to become gap makers than the canopy trees in the closed stand; 3 ） The average, maximum and minimum size of expanded gap （EG） and canopy gap （CG） in the forest were 257 and 113m^2, 540 and 353m^2 , and 101 and 26m^2, respectively; 4） Gap size affected the richness and density of seedlings and saplings significantly but not on big trees; 5 ） The species richness and Shannon-Wienner diversity index in each gap increased with the gap size, while the species numbers per m^2 in each gap and the species per stem in each gap decreased with the gap size.