广西大平山自然保护区种子植物多样性及区系特征分析
Diversity and Floristic Characteristics of Seed Plants in Daping Mountain Nature Reserve, Guangxi
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摘要: 为广西大平山自然保护区的生物多样性保护和可持续利用提供参考,采用野外调查和资料查阅相结合的方法,对广西大平山自然保护区野生种子植物资源现状及区系特征进行分析。结果表明:①植物种类多样丰富,已知种子植物137科529属1017种,其中乔木物种占优势,其次为草本。②科以含2~10种和1种的科占优势,分别占56.20%和24.09%;属以含2~4种和1种的属占优势,分别占31%和62.57%。③科的分布区类型有10种类型和4种变型,其中泛热带分布的科占比最多,占38.69%,热带区系成分与温带区系成分的比值(R/T)为3.42;属的分布区类型有13种类型和14种变型,其中以泛热带成分为主,其次为热带亚洲成分,分别占22.68%和16.64%,R/T为4.07。④重点保护植物55种,其中兰科植物共有21种,占比38.18%。⑤与邻近地区比较,大平山自然保护区植物多样性丰富,植物区系成分与大明山自然保护区较相近。热带性质明显,起源古老。Abstract: Through field investigations and literature review,this study comprehensively documented the current status of wild seed plant resources and analyzed floristic characteristics in the Dapingshan National Nature Reserve,Guangxi,aiming to provide scientific basis for biodiversity conservation and sustainable utilization. Key findings included:① the plant species exhibited rich diversity,with 1017 known species of seed plants belonging to 137 families and 529 genera. Among these,tree species predominated,followed by herbaceous species.② Family composition showed dominance by small-sized families,with 56.20% containing 2~10 species and 24.09% being monotypic. At generic level,62.57% were monotypic and 31% contained 2~4 species.③ Floristic analysis revealed 10 family areal-types with 4 subtypes,dominated by pantropical elements(38.69%),showing a tropical vs. temperate floristic ratio(R/T) of 3.42. Generic distribution exhibited 13 types with 14 subtypes,dominated by pantropical(22.68%) and tropical Asian elements(16.64%),yielding an R/T ratio of 4.07.④ The reserve was home to 55 key conservation species,including 21 Orchidaceae species(38.18%). Comparative analysis indicated close floristic affinity with neighboring Damingshan Nature Reserve. The flora demonstrated distinct tropical characteristics with ancient origins. These findings highlight the reserve's significance in maintaining biodiversity and conserving paleoendemic flora.