西藏佩枯错种子植物区系研究

为了丰富西藏高原植物区系地理研究资料,深入开展该区域植被生态学研究、生物资源开发利用与保护,该研究通过野外调查、标本采集以及查阅相关的文献资料,对西藏佩枯错种子植物区系进行了统计分析。结果表明:(1)植物种类较贫乏。佩枯错共有种子植物31科77属115种,仅占西藏种子植物的18.90%、6.73%、2.17%。其中裸子植物2科2属2种,被子植物29科75属113种;被子植物中双子叶植物有23科58属91种,单子叶植物6科17属22种。(2)优势科明显,单种科占绝对优势。所有科中有5个科至少含有7种种子植物,占该研究区总种数的39.13%,是该区系的主要组分;同时科数中有11科仅含1种植物,该类科占一定优势。(3)种子植物的区系成分较复杂,划分为3个科分布区类型和10个属分布区类型,其中温带成分占绝对优势:温带分布科、属分别占总数的29.03%和77.92%,表明本区系具有明显温带性质。(4)科属特有现象不明显,没有中国特有科分布,仅有1个中国特有属分布,说明佩枯错植物区系的特有化程度极低,表现出寒旱化与高山、高原特化综合而成的高寒植物区系的年轻性。

Studies on flora of seed plants in Peiku Co, Tibet, China

In order to enrich the research data of the Tibetan Plateau flora, and to further study on vegetation ecology and development, utilization and protection of biological resources in Tibet. Collection of specimens and reference of relevant literature, the flora of seed plants in Peiku Co in Tibet was analyzed based on field survey. The result were as follows:(1)Flora of Peiku Co was not abundant. There were 31 families, 77 genera, 115 species, accounting for 18.90%, 6.73% and 2.17% of all the seed plants in Tibet, in which there were two gymnosperm species, being owned by two genera and two families; 113 angiosperm species, belonging to 75 genera and 29 families. In the angiosperms, the dicots, with 91 species in 58 genera of 23 families, were predominant in the futuristic composition, and the monocots had 22 species in 17 genera of 6 families.(2)Obvious advantageous families, a distinct species branch represented the certain advantage. Of all the families, five families had at least seven species of seed plants, accounting for 39.13%of the total species in the study area, which was the major component of this flora. At the same time, evleven families contained only one species of unquestionable benefit plants.(3)The futuristic geographical composition of this area was complex which had three distributional types in the family level, ten distributional types at the genera level. Among them, temperate compositions were dominant absolutely, families and genera distributed in temperate accounted for 29.03% and 77.92% of total families and genera respectively, indicating that this area has obvious temperate nature.(4)There was no discernible peculiar phenomenon in the genus and no distribution endemic families to China, but one genus endemic to China, which indicates that the endemic flora of Peiku Co is very low, and also indicates the adolescence of alpine flora combined the with cold and drough, and plateu specialization.