福建永定县的常绿阔叶林

据对永定县常绿阔叶林的31处共3100m~2典型样地统计,共含维管束植物136种,分属43科86属.单种和两种属共占总属数的93%.群落区系以樟、壳斗、山茶和茜草等科以及热带,泛热带地理成分(分别占总属数的43.0%和31.4%)为主.优势树种有栲属多种、木荷、青冈、蕈树和马尾松.群落类型有槠林等12个群系并具中、南亚热带植被过渡性特点.树种年龄结构和乔灌木多样性分析表明,群落已趋向中一晚年发育期并开始转为恢复发展的前期阶段.

STUDY OF EVERGREEN BROAD LEAF FOREST OF YONGDING COUNTY,FUJIAN, CHINA

This paper deals with the floristic composition, synthetical features of chief tree species, distribution of community type, age structure of tree and species diversity of tree and undergrowth of the evergreen broad-leaf forest in Yongding county, Fujian China.According to the surveys of 3100 m2 in 31 plots, there are 136 species of vascular plants belonging to 86 genera in 43 families. Analysis of floristic geographical elements indicated that the percentage of tropical and pan-tropical elements (such as the genera of Lauraceae, Fagaceae, Theaceae and Rubiaceae, etc. ) are dominant, making up 43. 0% and 31. 4% of the total unm-bers of genera, which showed the communities are transition types from mid-subtropical vegetation to south-subtropical vegetation.All communities may be divided into 12 formations in this area, with Castanopsis eyrei, C. fargesii, schima superba, Cyclobalanopsis glauca, Altingia chinensis and Pinus massoniana, etc. Analysis of the age structure of the tree and Shannon-Wiener's index of species diversity of the tree and undergrowth of these forests indicated that the communities belong to old-age types, but they appeaared the trend of progressive succession.