湖北省黄冈市龙王山维管植物区系分布

Flora Distribution of Longwang Hill in Huanggang City of Hubei Province

系统研究了湖北省黄冈市龙王山维管植物区系分布,维管植物区系呈现出较丰富的特征,维管植物82科166属210种,双子叶植物的比例80.95%;在构成科的结构中,含2～5属的寡型科占主导（45.51%）,其次为单型科（29.34%）;在构成属的结构中,单型属占主导（63.81%）,其次为含2种的寡型属（22.86%）。地理成分复杂,维管植物属共有14个分布类型和8个变型,表现出明显的泛热带成分（26.95%）和北温带成分（24.11%）,其次为东亚成分（12.77%）。植物区系起源古老。古老属占黄冈龙王山总属的14.46%;单型属和寡型属比例高,分别占总属的63.81%和30.00%;原始类型占黄冈龙王山总科的9.76%,占现存被子植物原始类群的13.33%;白垩纪时出现的科和第三纪建立的科占总科数的43.90%;喜树是优势木本树种之一。黄冈龙王山类似于一个岛屿,对黄冈植物多样性的保存发挥着重要的作用,特别是对古老属植物的保存意义重大。

The flora distribution of vascular plants in Longwang hill in Huanggang city of Hubei province was investigated. there are three characteristics of flora. The flora includes 82 families,166 genera,210 species of vascular plants,with dicotyledon accounting for 80.95%. families,including 2～5 genera（45.51%）,occupy the main position in structure of family,secondly for monotypic families（29.34%）; Monotypic genus occupies the main position（63.81%） in structure of genus. The floral geographical composition is complex,covering 14 distribution zones and 8 variable types and showing obvious elements of Pantropic（26.95%） and North Temperate（24.11%）. The floristic origin is ancient. The oligoclonal genera accounts for 14.46% in total genera. The proportion of monotypic genus and oligotypic genera including 2 or 3 species are high for 63.81% and 30.0%, respectively. Original families account for 9.76% in total families and 13.33% in total existing original families. Families from Cretaceous and the Tertiary account for 43.90% in total familes. Camptotheca acuminata Decne is one of the dominant woody species. Longwang hill in Huanggang was regarded as an island and played an important role on plant diversity of Huanggang, especially for saving the ancient genera.