庙岛群岛种子植物区系的研究

庙岛群岛有种子植物81科288属504种,发现2新变种,2属、19种为山东省新记录。以属的分析为主,结合种的分析,认为该地区种子植物区系为温带性质。该地区温带分布型属占总属数的56.6%,热带分布型属占总属数的33.2%,缺乏典型的热带科属。庙岛群岛南北植物交汇,具有复杂区系成分,优势现象明显,且拥有较多的滨海植物。该地区特有现象不明显,共有中国特有属3个,无地区特有属。庙岛群岛种子植物区系与邻近地区研究表明,在属级水平上,庙岛群岛种子植物区系与河北、辽宁的相似性较高,与安徽、江苏和北京的相似性依次递减。Raunkiaer生活型组成大小依次为地面芽植物(27.4%)高位芽植物(25.8%)1年生植物(25.0%)隐芽植物(19.3%)地上芽植物(2.6%)。

Research on Flora of Seed Plants in Miaodao Archipelago of Shandong

There are now 504 species of seed plants in Miaodao archipelago,belonging to 81 families and 288 genera,two new variants are discovered,and 19 species in two genera of them are newly recorded in Shandong Province.According to the analysis of the seed plant genera and species,the flora of seed plants in this area has typical temperate features.Of all the genera,the temperate distributed genera accounts for 56.6%,while the tropical distributed genera accounts for 33.2%,there are no typical tropical species and genera.Both the North and South plants can be found in Miaodao archipelago,where there are complex floristic elements and rich costal plants.Only three genera are endemic to China,and there is no regional endemic genus.The flora of seeds plants in Miaodao archipelago is compared with that of neighboring areas,indicating that the seeds plant genera in Miaodao show high similarity with that in Hebei and Liaoning Province,but presents decreasing similarity with that in Anhui,Jiangsu and Beijing.The composition of Raunkiaer’s life-form is arranged as Hemicrytophytes(27.4%)>Ghanerophytes(25.8%)>Therophytes(25.0%)>Cryptophytes(19.3%)>Chamaephytes(2.6%).