四川都江堰龙池地区珙桐群落生态初步研究

对四川都江堰龙池地区珙桐群落进行样方调查，并调查了散生的珙桐种群。分析了珙桐群落的植物区系构成；从样方的物种构成、重要值排列、群落结构三方面的相似性来分析并划分珙桐群落类型，并讨论群落不同层次及结构因子间的相关性；比较不同珙桐群落中乔木层常见种的径级结构，探讨珙桐在群落中的地位及更新状况与群落演替进程间的关系；对本地珙桐的有性和无性繁殖特征进行分析，并与都江堰、湖北鹤峰、五峰的珙桐种群的径级结构作

A RPELIMINARY ECOLOGICAL STUDY OF DAVIDIA INVOLUCRATA COMMUNITIES AT LONGCHI REGION IN DUJIANGYAN COUNTY OF SICHUAN PROVINCE

The Gongtong(D. involucrata )communities at Longchi region in DuJlangyanCity of Sichuan Province were surveyed. The compositions of flora of D. involucratacommunities are analyzed,and the types of D. involucrata communities are classified andcontrasted by the similarity of the samples on account of their species composition,therank of importance value,and community structure. The relationships among the different layer and structural factors are discussed,and the diameter class structure of usualspecies in tree layer of the communities are used to investigate the relationship betweenthe current status,the regeneration condition of D. involucrata in the communities andthe successive stages of the communities. The characteristics of sexual and asexual regeneration of D. involucrata are also analyzed and a contrast is made with that of D. involucrata population at Hefeng and Wufeng in Hubei Province. In conclusion,Longchi region in Dujiangyan City belongs to the sub--suitable region for the distribution of D. involucrata according to the distribution,growth and regeneration of it. Although D. involucrata can maintain its existence here much stable now,the situation of its populationdevelopment isn't unreliable.