九寨沟县兰科植物多样性及区系特征OA

Through field investigations and literature review,this study analyzes the diversity,life forms,threatened status,distribution patterns,and floristic characteristics of Orchidaceae in Jiuzhaigou County.The results indicate:(1)The Orchidaceae resources in this region were relatively rich,comprising 27 genera and 75 species,with Cypripedium being the most abundant genus.Monotypic and oligotypic genera(containing 2 or 3 species)form the main body of Orchidaceae diversity in Jiuzhaigou County.(2)Analysis of life forms reveals that terrestrial orchids dominated the region,accounting for 90.67%of the species.(3)Among the rare and endangered orchids,65 species were listed as national key protected plants,while the survival prospects of 23 orchid species were concerning.(4)The altitudinal range of 2 001 m～3 000 m was the most species-rich zone for Orchidaceae,with 39 species recorded.(5)In terms of floristic composition,the orchid flora in this area exhibited a marked temperate character and possesses a notably high proportion of endemic species.These findings underscore the necessity of conserving Orchidaceae diversity in Jiuzhaigou County,while the research also enriched the baseline data for orchid conservation studies in this region.