秦岭田峪河流域种子植物区系研究

田峪河流域是陕西秦岭植物园的核心区，有种子植物128科，605属，1231种（不含种下等级）。区系分析表明，该流域仍以温带成分为主，占总属的70.96%，热带成分占21.13%，地中海与中亚成分占4.41%，中国特有属占3.5%，稀有濒危植物、单种属和少种属、中国特有属及木本植物均占较大比重，说明了历史起源的古老性，地理成分复杂，联系广泛，分布交错，具有明显的温带特征。

The studies on the flora of seed plants in Tianyuhe River- Valley in Qinling Mountains

There are 128 families,605 genera and 1 231 species (infraspeci fic taxa were not inclued) of seed plants in Tianyuhe River-Valley in Qinling Mountains.The floristic analysis shows that 70.96% (386 genera) of total genera are temperate composition,21.13% (115 genera) are tropic composition,4.41% (24 genera) are Mediterranean and Central Asia composition,and 3.5% (19 genera) are endemic to China in this drainage basin.Therefore the floristic character of this drainage basin is mainly temperate composition.