福建三明瓦坑的赤枝栲林

 本文讨论的赤枝栲1)(Castanopsis kawakamii)林，地处福建省三明市郊瓦坑地区，属我国中亚热带东南缘。据调查31块样地共3100m2群落种类组成中，含维管束植物52科、90属、139种；其中单种属占总数的75.6%。植物区系为热带、泛热带分布的成分、共占科与属总数的61.5%与67.8%。高位芽生活型植物占总数的87.9%。基于对群落外貌的植物生活型与叶特征等分析表明，该群落是从南亚热带雨林到中亚热带常绿阔叶林的过渡类型。对该森林乔木种的年龄结构分析，乔、灌木种多样性指数与均匀度的计算等，显示出赤枝栲林是相对稳定性较大的群落。

STUDY OF THE CASTANOPSIS KAWAKAMII FOREST IN THE WAKENG AREA OF SANMING CITY, FUJIAN PROVINCE

The evergreen broad-leaf forest of trees of the Castanopsis kawakamii species is located in the Wakeng area of Sanming City(117?20′E,26?10′N), Fujian Province, on the southern boundary of the mid-subtropical region in China. The floristic composition of the communities in 31 plots totalling 3100m2 in area consists of 139 species of vascular plants, 52 families and 90 genera. Of the 90 genera, 75.6% are single species genera. Analysis of floristic geographical elements indicated that the percentages of tropical and pan-tropical elements are high, making up 61.5% and 67.8% of the total numbers of families and genera respectively. The physiognomy of the communities was analyzed on the basis of the life forms of the plants and their leaf characters, which showed this forest was a transition type from south-subtropical rain forest to mid-subtropical laurilignosa(evergreen broad-leaf forest).The homogeneity and Shannon-Wiener’s index of species diversity of Castanopsis kawakamii forest were 20.9342% and 4.3992 respectively. Analysis of the age structure of the trees of the forest showed that it was a community of relative stability.