河南省植物区系地域分异研究

在最新植物区系资料的基础上,对河南省境内的大别山、桐柏山、伏牛山南北两坡和太行山等地的种子植物区系的差异性和相似性进行了对比分析,结果为大别山与桐柏山的关系最为密切,伏牛山南北两坡的关系最为密切,而太行山与前四者的相似性系数均小,它们在中国的植物分区中应分属于三个不同的植物地区。大别山和桐柏山应属华东植物地区,太行山属华北植物地区,而伏牛山南北两坡关系密切不宜分为两个植物地区,但伏牛山中国特有种的地理成分更接近华中植物地区。

Study on the Floristic Differentia Among Areas in Henan Province

Henan Province is located in transition zone from temperate to subtropic, ranging from 110?21'to 116?39'E, 31?23'to 36?22 'N. Its various physical conditions and long geologic history made it abundant in species and complex in floristic elements. This paper studies the difference and recemblance among the floras of different areas in Henan Province based on the latest floristic data. It consists of four parts. The first part gives a brief introduction to the flora as well as the natural factors influencing its development and distribution in Henan Province. There are 2954 wild species in 896 genera and 152 families, accounting for 10%, 29% and 45% of the same kind plants of China respectively; among which 24 species in 14 genera and 6 families belong to Gymnosperm, the others to Angiospermae,1831 species to herb (62%) and 1123 species to xylophyta (38%) in the province. The flora is characterised by complex geographical elements and obvious difference among areas as well as old origin and rich spermatophytes and endemic species to China. The second part mainly analyses the difference among the floras of six areas in Henan, including Dabie Mountain, Tongbai Mountain, the north and the south sides of Funiu Mountain, the Taihang Mountains and the Eastern Plain in the province, in the light of their floristic composition and distribution types. The result is that in Dabie Mountain and Tongbai Mountain, the endemic species to China widely ranging in the subtropic are the most; in the south side of Funiu Mountain, the endemic species to China coexisting in Huazhong floral regions and Sorth-West floral region are the most, and in its north side the percentages of the different geographical elements of the endemic species to China tend to the same. The third part explicates the relationship between five mountain floristic areas by calculating their coefficients of similarity of species(Czehanowski). The coefficient of similarity between Dabie Mountain and the Taihang Mountains is 88.4%, between the north and the south sides of Funiu Mountain 83.7%, between Taihang Mountains and Dabie Mountain, Tongbai Mountain, the north and the south sides of Funiu Mountain,52.7%,57.4%,61.1%,68.5% respectively. It shows the degree of resembles between the five floristic areas in Henan Province. The last part summarizes the characteristic of floristic differentiae among areas in Henan Province. The conclusion is that Dabie Mountain and Tongbai Mountain are closed, the north and the south sides of Funiu Mountain closed but the Taihang Mountains alone in their floristic character. Therefore the 5 mountains area can be divided into 3 floral regions of China. Of them Dabie Mountain and Tongbai Mountain belong to Huadong floral region, the Taihang Mountains to Huabei floral region, the sides of Funiu Mountain to Huazhong region (the ridge of the Funiu Mountain shouldn't be the boundary of Huabei and Huazhong floral regions, its two sides shouldn't be treated as one unit and it more resembles Huazhong region than any other region in China in floristic nature).