珍稀植物十齿花种群结构与分布格局

为探明珍稀保护植物十齿花种群的结构动态和分布格局特征,在贵州玉舍国家级森林公园设置了10个有代表性的样地,应用相邻格子法进行调查获得野外资料。根据径级结构图、高度结构图、种群特定时间生命表和存活曲线分析十齿花种群动态;应用聚集强度指数分析种群分布格局。结果表明:十齿花幼苗幼树总体上比例较大,但多数样地的种群有衰退的趋势;随着个体的不断生长,个体死亡率逐渐增大;种群格局整体上呈集群分布,但在不同发育阶段,集群程度有所差异,随着种群径级的增大和高度的增长,聚集强度逐渐下降。十齿花的种群结构和分布格局受十齿花生物学特性以及人为干扰等因素的影响。分析认为,林窗的形成有利于十齿花幼树幼苗的更新,保持十齿花种群的稳定发展。

The Population Structure and Distribution Pattern of Rare Plant Dipentodon Sinicus

Dipentodon sinicus was one of the Chinese national second protective wild plants.To investigate and describe the structure,dynamics and distribution pattern of D.sinicus population.Ten plots were established in Yushe National Forest Park,Western China,and field data were obtained by tally with contiguous grid quadrate method.Based on the analysis of size structure,height structure,time-specific life table,survival curve and assembling intensity indexes,the population structure and distribution pattern of D.sinicus were discussed.The results showed that the population structure of D.sinicus in majority samples were declining due to lack of seedlings and springwoods,although the proportion of seedling and springwoods did not small in the mass.With the growing of the individuals,the mortality rate of the individuals was increasing.The distribution pattern of D.sinicus,generally speaking,was clump,but there are differences in terms of intensity among various developmental stages: the more of the size structure and height structure,the less intensity of clump.It was related to their biological and ecological characteristics. Based on the analysis,suggesting that forest gap makes for regeneration of the seedlings and springwoods,so as to the D.sinicus population keeps a steady expanding.