摘要
为探明平当树(Paradombeya sinensis Dunn)的群落特征,本文以己衣大裂谷新发现的平当树群落为研究对象,通过设置样方来调查分析群落的种类组成、区系成分和种群特性。结果显示:(1)平当树零星间断分布于金沙江及其支流的干热河谷区域;(2)平当树群落科属的分布区类型以热带为主,种的分布类型以温带为主;(3)平当树开花结实率较高,但由于其起源特殊,加之自身特性和生境的影响,导致其幼苗极少;(4)平当树的种群年龄结构呈上升-下降的特征,Ⅰ级(更新苗)占比最小,表明种群的更新能力较差。调查区域是目前平当树分布海拔最高、面积最大、株数最多且保存较为完好的地区,区域内种群年龄结构属于增长型,且接近于稳定型,推测该区域是平当树的适宜生境。
This study characterized the community structure and population dynamics of Paradombeya sinensis Dunn based on a newly discovered population in the Jiyi Grand Canyon.Quadrat-based surveys were conducted to analyze species composition,floristic elements,and population traits.Results indicated that:(1)P.sinensis occurred sporadically and discontinuously across dry-hot valley systems along the Jinsha River and its tributaries.(2)The families and genera within the P.sinensis community were predominantly of tropical biogeographic origin,while species distribution patterns corresponded more closely to temperate zones.(3)Although P.sinensis displayed high flowering and fruiting rates,seedling recruitment was severely limited,likely constrained by its unique evolutionary history,specialized habitat requirements,and intrinsic biological characteristics.(4)The population exhibited a“growth-decline”age structure,with seedlings(ClassⅠ)representing the smallest cohort,indicating critically poor population regeneration.The Jiyi Grand Canyon population represents the largest,highest-elevation,most densely clustered,and least disturbed P.sinensis community currently known.Its demographic profile,indicative of a developing population nearing structural stability,suggests that this habitat offers optimal ecological conditions for species persistence.
作者
李建伟
杜凡
杨健明
原日强
石明
Li Jianwei;Du Fan;Yang Jianming;Yuan Riqiang;Shi Ming(College of Forestry,Southwest Forestry University,Kunming 650224,China;Institute of Bamboo and Rattan/Engineering Research Center of Sympodial Bamboo,Southwest Forestry University,Kunming 650224,China)
出处
《植物科学学报》
北大核心
2025年第4期463-471,共9页
Plant Science Journal
基金
云南省基础研究专项重大项目(202101BC070002)。
关键词
平当树
群落
种群
濒危
年龄结构
Paradombeya sinensis
Community
Population
Endangered
Age structure
作者简介
李建伟(1997−),男,博士研究生,研究方向为植物多样性保护与利用,E-mail:535948522@qq.com;通信作者:石明,E-mail:497445471@qq.com。
