秦岭南坡旬河中上游地区植物区系初步研究

A preliminary study on the flora in the middle and upper reaches of Xunhe River basin

植物种类组成是植被的重要特征之一 ,研究一个地区的植物区系有助于加深对植被的认识。旬河流域中上游地区位于秦岭南坡。该地区植物种类丰富 ,共有种子植物 1 1 2科 395属 750种。植物区系地理成分十分复杂 ,具有明显的温带特征 ,但和热带植物区系有一定联系。其起源也很古老 ,有 8种植物属于原始的被子植物 ,并有 8个单型属和 1 1个少型属 。

The species composition is one of the important characteristics of the vegetation,so it contributes to deep the knowledge of vegetation to study the flora.The middle and upper reaches of Xunhe River basin locates in the south face of Qinling Mountain.The flora of seed plants from it is rich and there are 112 families,395 genera and 750 species in this region.The geographical compositions of the flora in the region are very complex.The flora exhibits the characteristic of a temperate flora,but it has some links with the tropic flora.The origin of the flora is very old,that is there are 8 species of primal angiosperm and 8 one species genera and 11 few species genera.In addition,there are many survival plants.