广东南昆山与大岭山孑遗植物伯乐树群落特征比较与谱系地理学研究

以群落学方法和谱系地理学方法,分析广东省南昆山与大岭山珍稀孑遗植物伯乐树种群之间的关系,揭示它们的遗传结构并比较所处群落的异质性.群落分析发现,南昆山和大岭山伯乐树所在群落无论在区系成分上还是在物种组成上均表现出极大相似性,同时也稍有差异:大岭山伯乐树所在群落的物种多样性不及南昆山;两群落内伯乐树种群龄级结构均不完整,...

Studies on the community feature comparison and phylogeography of relic plant Bretschneidera sinensis in Nankun and Daling Mountain, Guangdong Province

Chloroplast DNA(cpDNA)markers and community analysis methods were used to determine the relationship between populations of rare and relic plant Bretschneidera sinensis in Nankun Mountain and Daling Mountain and to identify the genetic structure and community feature differences.Community analysis revealed a strong similarity between the two populations in both floristic elements and species compositions,while also implied differences in species diversity,which was much greater in Nankun Mountain.The age structures of B.sinensis in the two communities were incomplete,and the population in Nankun Mountain showed greater vital force.Phylogeographical analyses indicated that the haplotype diversity(hd)of populations in Nankun and Daling Mountains was 0.682 and 0 respectively,and the nucleotide diversity(π)was 0.181×10-3 and 0 respectively.GSTand Nm between the two populations were 0.167 and 2.49 respectively.The study indicated that the two populations represented a metapopulation,and the origin of the B.sinensis population in Nankun Mountain might be more primitive.Both haplotype diversity and nucleotide diversity of B.sinensis were much higher in Nankun Mountain than in Daling Mountain;therefore,the conservation of B.sinensis in Nankun Mountain should be of higher significance.