<正>采用RAPD分子标记技术对广西何首鸟野生种质资源进行遗传多样性分析。结果表明：40对随机引物用于PcR扩增，共得到295条扩增DNA片段，175个多态性片段，多态性达到59.3%，其中田林种源与西林种源之间的遗传变异最小，西林种源和灌阳种源之间遗传变异最大；根据RAPD标记划分10个何首乌野生种源得到5个品种群，这5个类型与地理分布有一定关系，地理位置较近的材料能聚在一起。分子标记可用于何首乌种质资源的分类、真伪鉴定及良种选育。

The quantitative characters of 30 community plots at different successional stages were studied. The main results showed: (1)Species richness and species diversity of shrubtree 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.