安徽祁门地区种子植物区系组成及特征

祁门地区位于皖南山区南端,种子植物区系组成丰富,经调查种子植物有147科731属1822种(包括亚种、变种、变型),其中17种为国家级珍稀濒危保护植物。该地区的种子植物优势科为木通科、猕猴桃科、槭树科、金缕梅科、榆科等亚热带和温带分布科。科有11种分布类型,以泛热带分布为主(占51.9%);属有14种分布类型,以北温带分布最多(占20.5%),其中温带性地理成分占55.6%;种有13种分布类型,以中国特有分布最多(占50.8%),其中温带性地理成分占33.1%,因此该区系地理成分复杂,并且具有温带区系性质。此外,该区系起源古老;替代现象和特有植物较为明显。

Composition and characteristics of spermatophyta flora of Qimen Region in Anhui Province

According to investigation, there are 1 822 wild species(including subspecies, varieties, forms) in 731 genera of 147 families in Qimen region, located in the south of Anhui Province. The spermatophyta flora of Qimen is rich, and 17 of these species are the rare and endangered plants protected by law in China. Lardizabalaceae, Actinidiaceae, Hamamelidaceae, Ulmaceae, and so on are the dominant families which are subtropical and temperate-distributed. Based on their geographical distribution, 147 families are classified into 11 areal-types among which Pan-tropical element is dominant ( 51.9%). 731 genera are classified into 14 areal-types among which north temperate element is dominant ( 20.5%), and the temperate elements make up 55.6%. 1 822 species are classified into 13 areal-types among which Endemic to China element is dominant ( 50.8%), and the temperate elements make up 33.1%. Therefore, this flora is temperate in nature, and the geographical elements are complex. In addition, the origin of Qimen flora is ancient; its endemism and vicarious phenomenon are relatively marked.