Abstract: The biodiversity of typical Tiankeng in Hanzhong, Shaanxi Province was investigated, and the vascular plant diversity flora in this area was preliminarily studied on the basis of systematically collecting the biodiversity research results and data around Tiankeng. The results showed that there were 940 species of angiosperms, 20 species of gymnosperms and 73 species of ferns in the Hanzhong Tiankeng group. The flora composition was dominated by temperate plants, and mixed with tropical plants. It showed that this area was an transition zone from warm temperate zone to subtropical zone, and the flora had certain antiquity. At present, 30 species of rare and endangered plants had been found in the Tiankeng Group, which was the ‘sanctuary’ for the existing rare and endangered plants. The research results were of great significance for the sustainable development and utilization of ecological resources, the conservation and restoration of biodiversity in Tiankeng Group.

Key words: Hanzhong Tiankeng group, species diversity, distribution

摘要： 对陕西汉中典型天坑生物多样性进行调查，并在系统收集天坑周边生物多样性研究成果与资料的基础上，对该区维管植物多样性区系进行初步研究。结果表明，汉中天坑群区域有被子植物940种，裸子植物20种，蕨类植物73种。该区植物区系以温带成分为主，兼具热带成分，展示了明显的由暖温带向亚热带过渡的特点，且区系具有一定的古老性。天坑群已发现30种珍稀濒危植物，是现存珍稀濒危植物的“避难所”。该研究对探究天坑群地区生态资源可持续发展利用、天坑生物多样性的保育以及恢复重建等方面具有重要意义。

关键词: 汉中天坑群, 生物多样性, 区系分析