贵州茂兰退化喀斯特森林群落的数量特征

对不同演替阶段30个群落样地的数量特征进行研究。结果表明:(1)在自然恢复过程中,灌木林阶段物种丰富度和物种多样性均高于乔木林阶段,前者均匀度也稍高于后者,而乔木林阶段生态优势度有所增加;(2)退化喀斯特森林群落具有较为明显的优势种,通常为1~2种;(3)退化喀斯特森林群落的生物量随自然恢复演替的进程不断增大,群落生物量构成也随自然恢复演替的进程而发生变化,灌木林的草本层和灌木层平均生物量都远高于乔木林的相应值,分别是乔木林的5.4倍和3.5倍;(4)群落的连续带指数分析反映了不同群落类型在群落演替中所处的地位。

Quantitative Properties of Degraded Karst Forest Communities in Maolan Mountain Area of Guizhou

The quantitative characters of 30 community plots at different successional stages were studied. The main results showed:(1)Species richness and species diversity of shrub-tree stages were higher than those of arbor-tree stages, the evenness of the former were gradually higher than those of the latter, but ecological dominance increased in natural restoration process;(2)Communities of degraded Karst forests have usually 1~2 dominant species;(3)Biomass accumulated gradually with the natural succession process. Meanwhile, the biomass components of different communities changed continually. The average herb layer biomass and shrub layer biomass of shrub forests were higher than those of arbor forests, respectively 5.4 and 3.5 times higher than those of arbor forests;(4)The community continuum index could be used to reflect the roles of different communities in succession stages.