陈大霞+易思荣+张雪+潘媛+崔广林+李隆云+张泽

[摘要] 为了解川续断种群的伴生植物状况和掌握其种群分布格局式样，采用样方法对川续断主要自然分布区的32个样地进行群落调查。结果表明：川续断种群的伴生植物种类共有60科131属156种，以菊科、蔷薇科种类较多；伴生植物的种类多，但大部分出现的频率较低；植被类型主要为草本和灌木，占总物种数的77.6%；方差/均值比率的t>t0.05，差异显著，表明川续断的分布格局为集群分布；7个聚集强度指数的测定结果也表明川续断种群符合集群分布特点（C>1，K>0，Ca>0，m*>1，m*/m>1，I>0，GI>0）。

[关键词] 川续断； 植物种类； 空间分布格局； 集群分布

[Abstract] In order to understand the associated species and the population distribution pattern， the investigation of 32 sample plotsfrom the main natural distribution area in Dipsacus asperoides community was carried by quadrat method .The results showed that there were 156 species， which belong to 131 genera and 60 families. There were more species in the two dominant families， Asteraceae and Rosaceae. There were many types of associated， but most appeared at a low frequency. The vegetation type were mostly herbaceous and shrub species， which accounted for 77.6% of the total species. The value of t was greater than t0.05 by methods of variance/mean， showed the difference was significant and the distribution pattern of D. asperoides were cluster distribution. The determination results of seven aggregation intensity index also showed that D. asperoides population accorded with the characteristics of cluster distribution（C>1，K>0，Ca>0，m*>1，m*/m>1，I>0，GI>0）.

[Key words] Dipsacus asperoides； associated plants；distribution pattern； cluster distribution

种群的空间分布格局是由植物种群自身生物学特性、种群关系和环境条件综合作用的结果，一般反映特定环境因子对植物生存、生长和行为的影响，研究种群的空间分布格局有助于揭示种群的内部组织结构、认识种群经历的生态学过程以及预测其发展趋势[1]。植物种群在群落中的分布主要有3种类型，即随机分布、集群分布和均匀分布。植物种的个体在群落中任何地方出现的机会是相等的为随机分布，以等距的间隔在群落中出现为均匀分布，集中分布形成个体群、个体簇、个体斑块等的分布形式则为集群分布。一般自然群落中集群分布的种是最多见的，均匀分布很少见。续断为我国大宗常用中药材，其市场供应主要依赖于野生川续断资源。我国川续断分布最为集中的区域为西南地区，分布区域生境复杂，生态型多样。目前，川续断空间……