Abstract: Based on the investigation on gaps and non-gap stands of the Karst forest in Maolan National Nature Reserve, Guizhou Province , the changeable regular pattern of species composition , relationship of species and life form feature during gaps development were analyzed . The results showed that family, genera and species of plant in gaps increased gradually from 10 to 30 years and decreased after 40 years . The composition of family and genera in 40 years was equilibrated to those in non-gap stands , but species number increased continuously . It indicated that species diversity increased and community composition structure became complicated and diversified with gap development . Similarity analysis of family , genera and species showed that the dynamic changes of vegetation in gaps were somewhat continuous and gradual , the similarities between the neighboring stages were greater than those between non-neighboring stages during gaps development . With
gaps development , the percentage of phanerophytes and epiphytic plants increased , hemicryptophytes and therophytes decreased correspondingly , but the percentage of chamaephytes and cryptophytes did not change much . With gaps development, community structure became stable and ecological function was enhanced .

Key words: Karst forest

摘要： 以贵州茂兰国家级自然保护区喀斯特森林为研究对象, 以群落调查为基础, 研究了林隙植被发育过程中物种组成、种间关系及生活型的动态变化规律。结果表明: 在林隙发育的10 年至30 年时, 林隙植物的科、属、种组成逐渐增加, 至40 年时有所下降, 科和属组成与非林隙林分基本持平, 但物种数继续增加。表征在林隙的恢复过程中, 来自不同分类群的物种增加, 群落组成更加复杂化和多样化。科、属、种三个等级均表现为林隙发育年龄越相近, 相似性系数越大, 林隙年龄相差越大时, 物种组成的相似性越小, 体现了林隙植被恢复的连续性。随林隙年龄的增大, 高位芽植物和藤本植物逐渐增多, 而地面芽和一年生植物则有减少的趋势, 地上芽和地下芽植物随林隙的发育变化规律不明显。随林隙的发育, 群落结构趋于稳定, 生态功能增强。

关键词: 喀斯特森林, 林隙动态, 物种组成, 生活型FONT