江苏宜兴维管植物区系分析

江苏最南端的宜兴地区共有维管植物166科、682属、1435种（含种下分类单位），以小科小属占据优势。区系成分以温带属为主，占55．84％。种的分布类型多为偏南分布，且宜兴为其分丰北界，其中以长江以南分布最多（40％）。宜兴维管植物区系特征说明宜兴具有明显的亚热带向暖温带地渡的性质，也证实了亚热带常绿阔叶林的中亚热带北界划经宜溧山区是可行的。

Analysis of Vascular-plant Flora at Yixing, Jiangsu Province

There are 1 435 species and varieties, 682 genera and 166 families of vascular plants in Yixing,the south part of Jiangsu province, mo st of which are small families and small genera. The flora is dominated by the t emperate distribution types (55.84%). Based on species census, it is characteriz ed by the southern-Yangtze distribution type (40%), which comes to its north bo rder. The character of vascular-plant flora indicated that subtropical zone tra nsferred to warm temperate zone in Yixing and demonstrated it was right that the north border of evergreen broad-leaved forest in middle subtropical zone was p assed by Yili Mountain.