湛江市城市森林树种结构分析

调查湛江市道路、公园和附属三类绿地159个单位的100 452株乔木,比较其物种多样性特征、物种组成特性、相对多度、物种重要值。结果表明:(1)湛江城市森林有52科204种乔木,物种多样性较丰富,树种结构受绿地类型、生境与人文等因素影响;(2)物种组成反映出热带季雨林地带性特色,外来种有96种,应用丰富,但乡土植物开发不足;(3)在调查的植株中,少数优势种占很大比例,其中,道路绿地前25种植物相对多度高达89.66,公园有最多的非常见种;(4)物种重要值SI>1的有26种,7种基调树种反映了湛江城市森林的基本特色。

The Analysis of Species Composition of Urban Forest in Zhanjiang City

The survey investigated the 100 452 individual trees at 159 sites of roadside niches,urban parks and institutional ground.Compared by the species diversity,species composition,relative abundance(RA),species importance(SI),the results were as follows.(1) There were 204 tree species belonging to 52 families of Zhanjiang urban forest,the species diversity was abundant.The species composition of urban forest was influenced significantly by the different land uses,habitats and urban cultures,etc.(2) The species composition reflected the character of zonal flora of the tropical monsoon forest.Exotic group had 96 species and the exploitation of native trees was not enough.(3) Most trees were derived from a small group of dominant species.The RA of the former 25 species at roadside was 89.66 and there were the most uncommon species in parks.(4) There were only 26 species of SI(species importance) >1.Seven key species reflected the basic feature of Zhanjiang urban forest.