Characteristic And Spatial Distribution Analysis Of 30 Spermatophyte Floras In East China

This article deals with floristic phytography of spermatophyte in 5 provinces of east China.Which are Anhui province, Jiangsu province, Zhejiang province , Jiangxi province and Fujian province. In this article, methods of flora analysis, quantitative classification, coefficient of similarity, clustering analysis, relationship between biodiversity and the environmental factors are all applied to study the spatial distribution of spermatophyte in east China.Floristic characteristic:(l)At the level of the family, there are 99 families of tropical and they have a proportion of 44% of the total genera. The numbers of temperate genera are 77, which is 34.4% of the total genera.At the level of genus, with thee total of 1217 genera in the 30 spermatophytes floras of east China, the tropical genera(2-7) are the richest ,which are 549, 45.1%of the total; The temperate genera (8-14) are 584, 43.3% of the total genera. Compared with proportion of the genera, of the 30 floras, the characteristic of tropical is more obvious than that of temperate.(2) The endemic of the 30 floras is very obvious, there are some old elements. Some of them are originned from the old north land and some are from the old Mediterranean Sea and old south land. According to the material that collected, at the level of genus, the number of this areal-type is 55, 4.5% of the total genera .It also has a proportion of 22.6% of the total endemic genera in China. Most of the endemic genera are single or small genus. Composition of the floras(l)Based on the statistic and analysis of the family, genus and species, a spermatophytes floristic study of the 30 floras was carried out. The results are as follows: the number of spermatophytes in the 30 floras consists 225 natural families,1217 genera and 4855 species(including subspecies).Among them, 9 famlies,23 genera and 38 species belong to gymnosperms,216 families, 1196 genera and 4818 species belong to angiosperm. It's the main composition of China and East Asia flora ; It's also the key area to study the origin and development of flora.(2) According to the number of the species in a family, the 225 families can be...