广西容县红锥天然林物种组成与群落结构特征

Species composition and community structure characteristics of Castanopsis hystrix natural forest in Rongxian county, Guangxi province

通过对广西容县红锥天然林群落的调查，研究了群落物种组成、结构特征和演替趋势，为红锥天然林群落保护及其人工林近自然经营提供科学依据。结果表明：红锥天然林共有物种60种，隶属于34科53属，单种属占88.7%；红锥在群落中占有主要优势，马尾松和乌榄为乔木层散生种；群落内丰富度表现为灌木层＞草本层＞乔木层，Shannon-Weiner多样性指数、Simpson多样性指数和Pielou均匀度指数均表现为草本层＞灌木层＞乔木层，垂直结构由林冠层、灌木层和草本层组成；群落处于以中生性树种为主的偏中生常绿阔叶林阶段，样地所有木本植物总径级在5～25 cm出现断层，但1～5 cm径级幼苗数量多，群落演替趋势表现为稳定增长型。

Castanopsis hystrix communities in Rongxian, Guangxi were investigated to explore their species composition, structure characteristics and succession trend. The results show that the C. hystrix natural forest consists of 60 species, belongs to 34 families, 53 genera, single species accounted for 88.7%. C. hystrix has major advantages in the community, Pinus massoniana and Canarium pimela are tree layer scattered species. Community richness （S） presented an order like this：shrub layer〉herb layer〉tree layer;and Shannon-Weiner diversity index （H）, Simpson diversity index （D）, Pielou evenness index （J） displayed a decline order from herb layer to shrub layer and tree layer. The communities vertically contained three layers：canopy, shrub and herb layer. The C. hystrix natural forest is at succession stage of mesophytic evergreen broad-leaved forest dominating by mesophytes. The diameter grades of all woody species in the forests appeared faultage in 5 to 25 cm, while those diameter grades from 1 to 5 cm of seedlings had had a larger quantity. The communities presented a succession trend of steady growth.