关键词: 云冷杉林, 林隙形成木, 多样性, 重要值

Abstract: An investigation was conducted in a 1.5 hm² permanent standard plot of Picea asperata and Abies fabri forest to determine the species, basal diameter, DBH, height, breakage height, formation mode, decayed level of all gap makers, the species, abundance, height, cover of all herbs and shrubs, and calculate their important value and richness in June August, 2013. The number of uprooted trees was 36, the number of stem breakage and base breakage was 17 and 6, respectively. The value of Pielou evenness index(J), Simpson eco-dominance index(D), Shannon index(H) were listed in the order of all uprooted tree>stem breakage>base breakage. Within the plots of uprooted tree and breakage, the important value of Aegopodium alpestre was the biggest, 14.2 and 13.2, respectively. The dominant species in the plots of uprooted trees are Impatiens nolitangere and Urtica fissa, but Aconitum carmichaeli in the plots of breakage. Under the same decayed level of tree falls, species richness in the plots of uprooted trees was more than that in the plots of breakage. The herbs’ richness in the east, south, west, north plots of base breakage and stem breakage were smaller than that in the control, but opposite in uprooted tree plots.

Key words: Picea asperata and Abies fabri forest, gap maker, diversity, important value