无量山种子植物的区系平衡点

THE FLORISTIC EQUILIBRIUM POINT OF SEED PLANTS IN MT. WULIANGSHAN

在较为完善的分类学处理后所得的包含２０７科，１０２６属，２５４０种植物的名录基础上，本文初步报道了地处滇中南的无量山的种子植物区系组成的初步结果，并在山体各海拔段进行了属的分布区类型每一类分布的详尽统计，得出了热带和温带两大基本成分在无量山达到平衡（各占５０％）的海拔点，称之为区系平衡点。该点从历史角度看可以反映无量山种子植物区系成分随自然历史变迁所发生的演变，从现实看表明了该地植物区系的过渡性质，同时，寓意着我国亚热带地区客观存在着一条区系平衡线，并且，该点还是热带成分的一个重要性限制点；

Based on the checklist of seed plants (comprising 2540 species in 1026 genera, 207 families) gained after a careful taxonomical treatment of all the materials, the paper has reported the initial results of the composition of the flora of seed plants in Mt. Wuliangshan which is located in the south-central part of Yunnan province, and has made exhaustive statistics of the distributions of all the genera with different areal-types at major height a.s.l. The height a.s.l.at which the two basic floristic elements, the temperate and the tropical, maintain their equilibrium(each has 50% of the total) is called floristic equilibrium point(FEP). From a historical point of view, the point probably reflects the development of the floristic elements of seed plants in Mt. Wuliangshan with the change of natural history; from the other point of view, it maybe indicates the transitional character of this flora and it suggests that there in fact is a floristic equilibrium line in the subtropical areas in China. Moreover, it is an important limit to the tropical elements. On the other hand, it may be regarded as a useful reference index for the introduction of plants and deciding the physically training base for acclimatization.