画稿溪国家级自然保护区桫椤种群结构和群落特征研究OA

Alsophila spinulosa has been listed as a national grade Ⅱ protected wild plant.Understanding the population structure and community characteristics of A.spinulosa is essential for effectively protecting the species in Huagaoxi National Nature Reserve(hereinafter referred to as"Huagaoxi").Both field survey and plot-based sampling were adopted to conduct a comprehensive investigation of the plant community with A.spinulosa in Huagaoxi.The result showed that:1)There were a total of 26 kinds of vascular plants in the sampled quadrats,belonging to 25 genera and 20 families.Among them,the arbor layer contained 14 species from 13 genera and 11 families,dominated by Cyatheaceae and Lauraceae,the shrub layer contained 7 species from 7 genera and 6 families,dominated by Lauraceae,Myrsinaceae,and Fabaceae,and the herb layer contained 7 species from 7 genera and 7 families,dominated by Gramineae,Pteridiaceae,and Iri-daceae;2)In terms of age structure,the A.spinulosa population was mainly composed of middle-aged indi-viduals,with few juvenile and mature ones,indicating an expanding population in the Huagaoxi area;3)In terms of life form,the community mainly consisted of phanerophytes;4)In the population of Cyatheaceae plants,the arbor layer was predominantly composed of evergreen species such as Alangium chinense,Ficus henryi,and Sinosassafras flavinervium,exhibiting typical characteristics of subtropical evergreen broad-leaved forests.This study provides updated data and theoretical basis for the conservation and sustainable utiliza-tion of the A.spinulosa population in Huagaoxi.