广州增城叶迳背乐昌含笑林群落特征研究

对广州南亚热带低丘平地的乐昌含笑(Michelia chapensis Dandy)林的群落特征进行了研究。结果表明,广州的乐昌含笑林组成种类复杂,1600 m2样带内有维管束植物44科58属70种,种子植物属以热带亚热带区系成分为主,体现出由热带向亚热带过渡的性质。群落结构较复杂,灌层密集而优势种明显,大径级个体较多,群落的胸高断面积极大,达66.13 m2 hm-2;频度分析表明本群落不符合Raunkiaer的频度定律,具有最大频度的种群比例小;基于样带面积统计的优势种年龄结构分析表明,群落建群种均属衰退种群,但从区域角度结合优势种群生物学特性的分析表明,本群落属本地带顶级群落类型,具有较高的稳定性。

Studies on Community Characteristics of Michelia chapensis in Yejingbei, Zengcheng, Guangzhou

The community characteristics of Michelia chapensis forestthat is located in south subtropical hilly plains in Guangzhou, China were studied. The results showed that there were 70 species belonging 58 genera and 44 families within a transect area of 1600 m². The flora was dominated by tropical and subtropical element, which showed the transition characteristics from tropics to subtropics. The community structure was complex, and the shrub layer was dense with obvious dominant species. There were more individuals with large diameter class, so that the basal area at breast height was very large and up to 66.13 m² hm^-2. Community frequency analysis showed that this community did not agree with the frequency law of Raunkiaer, and the population proportion with the highest frequency was small. The statistical analysis on age structure of dominant species based on transect area showed that the constructive species in the community were declining. Analyses from the regional view in combination with biological characteristic of dominant species showed that the community was the climax type in the location with high stability.