桂林岩溶石山阴香群落的数量分类及其物种多样性研究

采用双向指示种分析(TWINSPAN),对桂林岩溶石山阴香群落进行数量分类,并应用Patrick丰富度指数、Simpson指数、Shannon-Wiener多样性指数以及Pielou均匀度指数比较分析了各群丛类型的物种多样性特征。结果表明:(1)阴香群落可划分为5种群丛类型,分别为:Ⅰ.阴香-山合欢-荩草群丛;Ⅱ.阴香-石山桂花+粗糠柴-麦冬群丛;Ⅲ.阴香-石山桂花-麦冬+凸脉苔草群丛;Ⅳ.阴香-石山桂花+小叶女贞-麦冬群丛;Ⅴ.阴香-香槐+石山桂花-剑叶凤尾蕨+普通假毛蕨群丛;(2)阴香群落的结构较为简单,物种多样性相对较低;在5个群丛类型中,群丛Ⅲ和群丛Ⅴ的物种丰富度和多样性指数较高,群丛Ⅱ的多样性指数较低;由于生境条件和人为干扰程度的不同,群丛类型的物种多样性存在一定差异。

Numerical classification and species diversity of Cinnamomum burmannii community in karst hills of Guilin

Classification of Cinnamomum burmannii communities in karst hills of Guilin was conducted by Two-way Indicator Species Analysis(TWINSPAN),and species diversity was analyzed by various kinds of diversity indices such as the Patrick's richness index (R),Simpson index (D),Shannon-Wiener index (H) and Pielou's evenness index(E). The results show that:(1)the Cinnamomum burmanniicommunities could be divided into five types:Ⅰ.Ass.Cinnamomum burmannii-Albizzia kalkora-Arthraxon hispidus;Ⅱ.Ass.Cinnamomum burmannii-Osmanthus fordii+Mallotus philippinensis-Ophiopogon japonicus;Ⅲ.Ass.Cinnamomum burmannii-Osmanthus fordii-Ophiopogon japonicus+Carex lanceolata;Ⅳ.Ass.Cinnamomum burmannii-Osmanthus fordii+Ligustrum quihoui-Ophiopogon japonicus;Ⅴ.Ass.Cinnamomum burmannii-Cladrastis wilsonii+Osmanthus fordii-Pteris ensiformis+Pseudocyclosorusksubochthodes. (2)the community structure was simple,and species diversity indices were relatively lower. In the five community associations,species diversity indices of association Ⅲ and Ⅴ were higher than others,those of associationⅡ were relatively lower. Influenced by habitat conditions and human disturbance,species diversity was different among the association types.