关键词: 林木种质资源, 粤北林区, 青云山自然保护区, 植物区系, 物种多样性

Abstract:

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.

Key words: forest trees germplasm resources, northern Guangdong forestry area, Qingyunshan Nature Reserve, flora, species diversity