若尔盖地区(四川片区)种子植物区系分析

Flora Analysis of Seed Plants in Zoige Region(Sichuan District)

为完善若尔盖地区(四川片区)种子植物区系特征,以2019年至2022年在红原、若尔盖、阿坝和松潘四县调查数据为分析对象,结合文献资料,统计若尔盖地区种子植物区系现状。结果表明:(1)若尔盖地区野生种子植物有1173种,隶属74科367属,种子植物资源丰富,大部分为草本植物(77.41%);包含51种以上的科有菊科、玄参科、莎草科等6个科;包含21种以上的属有马先蒿属、柳属、风毛菊属等5个属。(2)科的组成上,小科(2~5种)和中等科(6~20种)是构成本区科的主体,占总科数的58.11%;属的组成上,单种属(1种)是构成本区属的主体,占总属数的49.05%。(3)从科的区系成分来看,划分为6个分布型和3个变型,其中温带分布科(39.19%)最多;属的区系成分来看,划分为15个分布型和13个变型,温带成分占总属数73.84%,占比最高,是典型的温带性质。(4)本区珍稀濒危野生植物共计48种,占总种数的4.09%,濒危物种丰富,孑遗古老。

In order to improve the flora characteristics of seed plants in Zoige region(Sichuan district),the survey data in Hongyuan,Zoige,Aba and Songpan counties from 2019 to 2022 were taken as the analysis object,and the current situation of seed plants in Zoige region was statistically analyzed based on the literature.The results showed that:(1)There were 1173 species of wild seed plants in Zoige area,belonging to 74 families and 367 genera,with abundant plant seed resources,most of which were herbaceous plants(77.41%).There were 6 families with more than 51 families including Compositae,Scrophulariaceae,Cyperaceae.There were 5 genera including Pedicularis,Salix,and Gerbera,which contained more than 21 species.(2)In terms of family composition,small families(2~5 species)and medium families(6~20 species)were the main families in the region,accounting for 58.11%of the total families.From the composition of genera,single species(1 species)was the main genus in the region,accounting for 49.05%of the total genera.(3)According to the floristic composition of families,it could be divided into 6 distribution types and 3 variants,among which the temperate distribution families(39.19%)were the most.In terms of the floristic composition of the genus,it could be divided into 15 distribution types and 13 variants.The temperate elements accounted for 73.84%of the total genera,with the highest proportion,which was a typical temperate nature.(4)There were 48 species of rare and endangered wild plants in this area,accounting for 4.09%of the total species,which were rich in endangered species and ancient relics.