福建南平安曹下老龄杉木群落生态特征

通过2 400 m2样地调查,研究福建南平溪后安曹下76年生杉木丰产林群落山坡和山洼部位的植物区系组成、群落外貌、多样性指数等群落生态特征,结果表明:老龄杉木群落物种组成丰富,共有维管束植物71科,119属,168种;蕨类植物种类比例大;种子植物属的分布区类型以泛热带成分占的比例最高(山坡和山洼部分分别为27.59%和34.55%),热带性分布成分占优势(山坡和山洼部分分别为70.11%和74.55%),体现了群落的中亚热带性质;各层次的多样性表现为:灌木层(包括幼苗幼树)>草本层>乔木层;坡位因子对老龄杉木群落生态特征产生一定的影响.

Ecological Features of an Old-growth Chinese Fir Community at Ancaoxia in Nanping of Fujian Province

The ecological features of a 76-year-old Chinese fir community,such as floristic composition,community appearance,and plant species diversity were studied.The sample plots were located at Ancaoxia,Nanping,Fujian Province,with an area of 2 400 m2.The results showed that the community had plentiful flora belonging to 71 families,119 genera and 168 species,and with a high percentage of fern species.Pantropic had the highest proportion among different areal types of genus of spermatophyte in the community(27.59% in the hillside and 34.55% in the low-land).The dominant areal types of genus of spermatophyte in the community were tropical components(70.11% in the hillside and 74.55% in the low-land),reflecting the middle subtropical characteristics of the community.The order of Shannon-Wiener species diversity index was shrub layer(including tree seedlings and saplings)>herb layer>tree layer.Environmental factor of slope position had some impacts on the ecological features of the old-growth Chinese fir community.