北仑河口国家级自然保护区红树植物群落研究

从生境条件、种类组成、类型、外貌、结构、物种多样性、演替等方面较为系统地分析了广西北仑河口国家级自然保护区红树植物群落的生态特征．红树植物种类有14种，隶属11科14属；其中，真红树有10种，半红树有4种．真红树群落可划分为8个群系，14个群落类型，建群种有卤蕨、白骨壤、桐花树、秋茄、木榄、海漆、老鼠和银叶树8种；半红树群落有2个群系，2个群落类型，建群种为黄槿和海芒果．群落物种多样性的Simpson指数(D)为1．09～5．34，Shannon—Weiner指数(H)为0．25～2．56、种间机遇率(PIE)为0．08～0．82和均匀度（E)为0．25～0．95．

ECOLOGICAL STUDY ON THE MANGROVE COMMUNITIES IN BEILUNHEKOU NATIONAL NATURE RESERVE

Ecological characteristics of habitat condition,flora,type,physiognomy,structure,species diversity and succession of mangrove communities in Beilunhekou National Nature Reserve,Guangxi,were systematically analyzed.14 species of mangrove plants,belonging to 11 families and 14genera,were found in the Reserve.Among them,11 species are true mangrove and 4 species are semi-mangrove.The true mangrove communities can be classified into 8 formations and 14 community types,and the main constructive species are Acrostichum aureum,Avicennia marina,Aegiceras corniculatum,Kandelia candel,Bruguiera gymnorrhiza,Excoecaria agallocha,Acanthus ilicifolius and Heritiera littoralis,respectively.The semi-mangrove communities can be classified into 2 formations and 2 community types,and the main constructive species are Hibiscus tiliaceus and Cerbera manghas,respectively.The Simpson index (D) of species diversity for the mangrove communities range from 1.09 to 5.34,Shannon-Weiner index (H) from 0.25 to 2.56,probability of interspecific encounter (PIE) from 0.08 to 0.82,and evenness (E) from 0.25 to 0.95.