云南大围山国家级自然保护区种子植物区系多样性特征

报道大围山种子植物区系的研究结果:大围山内现有野生维管植物238科1 121属3 299种,分别占全国维管植物总科、属、种数的65.38%、34.92%、12.15%.其中种子植物188科994属3 027种及变种,平均种密度高达19.69种·km-2,是全国植物物种多样性最丰富的自然保护区之一.区内种子植物的古老性、珍稀性、多样性和完整性极具代表性.其种子植物区系具有4个显著特征:1)种类组成丰富,属内种系相对贫乏,分化程度较弱;2)植物区系起源古老,古老的特有属丰富;3)大围山是多种区系成分的交汇地带,但热带分布的科占绝对优势;4)大围山植物区系与中南半岛特别是北部湾植物区系的联系紧密,同时与东亚植物区系亦有密切联系.

Flora Diversity Characteristics of Seed Plants of Dawei Mountain National Nature Reserve in Yunnan Province, China

The Dawei Mountain is one of the national nature reserves, which has the richest rare endangered plants and the most abundant biodiversity. The results from this study showed that there were 3 299 species of the wild vascular plants belonging to 1 121 genera and 238 families in this area, accounting for 65.38%, 34.92% and 12.15% respectively of the species, genera and families of vascular plant resources in China, among which there were 3 027 species of seed plants belonging to 994 genera and 188 families. The antiquity, rarity, diversity and integrity of seed plants in the reserve were very representative. There were 4 distinct features for the flora of the seed plants: 1) species composition is complex, while the number of species in genera is small and species differentiation in genera is weak; 2) the origin of flora is ancient, and the age_old and particular genera are abundant; 3) many floras converge in this area, and the families distributed in the tropics are dominant; 4) the floras here have close affinity with Indochina floras especially for the North Bay floras, mean while which also with East_Asia floras.