兰州市南北两山种子植物区系特征分析

兰州市南北两山有大量的植物资源，是兰州市生态系统的重要组成部分，对兰州市的城市生态环境具有举足轻重的影响。植物区系研究对植物多样性的保护有着重要的意义。以兰州市南北两山作为独立的种子植物区系单元，分别从科、属、种三个不同层面对植物种类、组成及性质等进行了深入分析。分析的结果表明：．兰州市南北两山有种子植物73科249属421种；兰州市南北山植物区系在发生和地理分布上有明显的温带性质；兰州市南北两山种子植物区系成分比较年轻，但是在组成成分里，常绿和落叶乔木、灌木，半灌木，多年生、一年生草本全有覆盖，体现了丰富的植物多样性。

ANALYSIS OF SPERMATOPHYTE FLORA CHARACTERISTICS IN SOUTHERN AND NORTHERN MOUNTAINS OF LANZHOU

This paper takes the Southern and Northern Mountains of Lanzhou city as an independent unit of the spermatophyte flora,respectively from the families,genera,three different levels of depth investigation and analysis of the spermatophyte flora species,the composition and properties of the two mountains.The results as following: 1.The range of northern and southern mountains Lanzhou city have seed plants 73 in 249 genera and 421 kinds;2.From the plant families,genera,species geographical elements can be seen,Lanzhou City,northern and southern mountains flora in the temperate nature of the occurrence and geographical distribution;3.The spermatophyte flora of Northern and Southern Mountains of Lanzhou City relatively young,but in the composition of evergreen and deciduous trees,shrubs and sub-shrubs,perennial herbs,annuals,all covering reflects the rich diversity of plants.