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作 者 ：张巧明1，王得祥1*，龚明贵2

期 刊 ：西北植物学报 2012年 3期 页码：589~595

关键词：秦岭；火地塘林区；种子植物；区系特征；聚类分析；

Keywords:Qingling Mountains, Huoditang, seed plant, flora characteristics, cluster analysis,

摘 要 ：采用植物区系地理学研究方法，结合野外调查数据和文献资料对秦岭火地塘林区种子植物区系的组成、地理成分特征进行分析，并与其它7个毗邻地区植物区系间的关系进行比较研究。结果表明：（1）火地塘林区有种子植物136科，547属，1 283种；（2）该区的种子植物主要以温带区系成分为主(335属，占总属数61.2%)，热带性质的植物次之（135属，占总属数24.7%）。该区植物种类丰富，地理成分复杂，具有明显的热带亚热带到温带的过渡性质；（3）火地塘林区种子植物区系成分与青木川、天华山、牛背梁、周至老县城植物区系亲缘关系较近，与东段的伏牛山次之，与西段的小陇山以及北部的子午岭有一定差异，表明秦岭植物区系成分的经向地带性，即经度越低，温带-北温带成分越高，经度越高，热带-亚热带成分越高。

Abstract:Based on field investigation and references,the floristic characteristics of seed plant in Huoditang were analyzed,and the relationship between the folra of Huoditang and 7 floras was also discussed.The results showed that:(1)there are 1 283 species belonging to 136 families and 547 genera in Huoditang.In those plants,the big families and big genera play important roles;(2)The geographical elements of the flora are comparatively complex,and the genera of temperate are the dominant areal types (335 genera，account for 61.2%);(3)The flora of Huoditang is very closed to Qingmuchuan,Tianhuoshan,Niubieliang and Laoxiancheng Nature Reserve,less close to Funiushan.It is far from Xiaolongshan and Ziwuling.The floristic variations with longitude in Qinling Mountains are that:the compositions of north temperate and temperate zone distribution increase with dropping of longitude,the compositions of tropics and subtropics zone distribution increase with rising of longitude.

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