林木种质资源对林业生产和社会发展具有重要的基础性和战略性意义。采用3S技术和系统采样方法,在广东省翁源县青云山省级自然保护区内开展野外调查。采用α多样性测度方法量化样方内的物种多样性,利用线性回归模型分析物种多样性指数与海拔之间的关系,从植物区系与物种多样性分析自然保护区内木本植物的植被特征。结果表明:1)研究区域共有木本植物32科48属82种,其中裸子植物3科3属3种、被子植物29科45属79种;2)48属木本植物可划分为14种分布区类型,其中热带和温带分布区类型各有35属和13属(分别占总属数的72.92%和27.08%);3)自然保护区内4类木本植物的α多样性指数随海拔升高呈上升趋势,线性回归模型分析表明,植物多样性指数与海拔之间无显著差异。自然保护区内森林植物资源具有较高的α多样性,并在300~700 m范围内随海拔增加呈上升趋势。

The forest trees germplasm resources are fundamental and strategic resources for social development and forestry production.This study focuses on the Qingyunshan Nature Reserve in Wengyuan County,a critical forest region in Guangdong Province.By using 3S technology and systematic sampling methods,6 transects and 6 quadrats were designated for field surveys of the vegetation.At the same time,the alpha diversity measurement method was employed to assess species diversity within these quadrats.Linear regression models were applied to analyze the relationship between diversity indices and elevation,providing insights into the vegetation characteristics of woody plants in the reserve from the perspectives of plant flora and species diversity.1)A total of 82 species belonging to 48 genera and 32 families of woody plants were recorded within the study area,including 3 families,3 genera,and 3 species of gymnosperms,and 29 families,45 genera,and 79 species of angiosperms.2)The 48 genera of seed plants could be classified into 14 distribution area,with 35 genera(72.92% of the total)having tropical distributions and 13 genera(27.08% of the total)having temperate distributions.3)The diversity indices for woody plants within the reserve demonstrated an upward trend with increasing elevation.Specifically,linear regression analysis highlighted significant variations in the Margalef richness index and Simpson dominance index across different elevational zones.The study underscores a relatively high diversity in the reserve,correlating positively with elevations ranging from 300 m to 700 m.