河口热区肉桂人工林植被群落演替特征研究

本研究以空间代替时间的方法,用物种丰富度指数 S 值、Shannon-Wiener 多样性指数 H 值、Simpson 优势度 指数 D 值、Pielou 均匀度指数 Jsw、Alatalo 指数 Ea 值来综合评价河口热区肉桂人工林群落特征,阐明该地肉桂林植被 群落结构的变化规律,为该人工林的生态改良提供参考。结果表明,河口热区肉桂人工林样地内共有维管植物 94 种, 隶属 45 科 84 属,物种组成以泛热带、热带亚洲等热带成分为主,毛桐（Mallotus barbatus）、臭牡丹（Clerodendrum bungei）、 构树（Broussonetia papyrifera）、华南毛蕨（Cyclosorus parasiticus）、华南鳞盖蕨（Microlepia hancei）、闭鞘姜（Costus speciosus）、海芋（Alocasia odora）等为主要优势物种。整个群落及其各垂直层次的各物种多样性指数在成熟林（15 a） 以下波动较大,随着林龄增加多样性指数变化趋于稳定,其中中熟林（20 a）的群落结构最稳定,幼林（5 a）群落较 不稳定。灌草层是该肉桂人工林的重要组成部分,建议在抚育采伐的过程中保护好灌草层植被群落。

Community Succession Characteristics of Cinnamomum cassia Plantation in Tropical Regions of Hekou,Yunnan

The community characteristcs of Cinnamomum cassia plantation in tropical regions of Hekou, Yunnan, were studied by the species richness index S, Shannon-Wienner index H, Simpson index D, Pielou index Jsw and Alatalo index Ea with space instead of time to evaluate the variation of the community structure, and to provide a reference for the ecological reclamation of the plantation. There were 94 species, belonging to 45 families and 84 genera in the C. cassia plantation, and the pantropical distribution and tropical Asian elements took up a predominant position in the species composition. The dominant species were Mallotus barbatus, Clerodendrum bungei, Broussonetia papyrifera, Cyclosorus parasiticus, Microlepia hancei, Costus speciosus, Alocasia odora, etc. Before the mature forest (15 a), the species diversity index of the whole community and its diversity had a high volatility, with the increase of forest age, the change of diversity index tended to be stable. The community structure of the mid-mature forest (20 a) was of the most stability, and the young forest (5 a) community was more unstable. Shrub and herb layer was an important part of the C. cassia plantation, which should be properly protected in nursing and harvesting.