摘要
铁坚油杉[Keteleeria davidiana(Bertr.)Beissn]为第三纪残遗裸子植物,被列为中国濒危树种,也是南盘江流域天然植被的重要组分。该研究于南盘江流域的广西雅长兰科植物国家级自然保护区内,采用典型样地法建立了1块面积为100m×80m的永久性标准固定样地,并运用林分空间结构参数二元分布(BDFSSSP)法分析铁坚油杉种群整体、大树(DBH≥15.79cm)和小树(5cm≤DHB<15.79cm)的空间结构特征,以揭示南盘江流域内天然次生群落中铁坚油杉种群的结构多样性。结果表明:(1)铁坚油杉种群整体处于随机偏向均匀分布(W=0.468)状态,混交度适中(M=0.480),个体径阶分化明显(U=0.472)。(2)多数大树同时处于优势地位(U=0.204)和中度混交(M=0.436)状态,格局为随机分布(W=0.483)。(3)小树的分布格局和混交状态与种群整体相似,但大部分小树都是劣势木(U=0.75~1.00)。研究认为,南盘江流域铁坚油杉种群与其相邻种群之间的空间结构具有多样性,铁坚油杉种群内部的空间结构也具有多样性,暗示整个种群可能处于稳定状态。
Keteleeria davidiana is tertiary period relict gymnosperm which is listed as China endangered tree species,and also is one of the most important tree species compositions of the natural vegetation along the Nanpan River. In this study, a standard permanent plot with 100 m X 80 m sizes was set up in Guan-gxi Yachang Orchid National Nature Reserve of Nanpan River basin by the typical sample method. The bi-variate distribution of forest stand spatial structural parameters （BDFSSSP） was used to analyze the spatial structural characteristics of the whole population and its big trees （DBH≥15. 79 cm） and small trees （5 cm DHB〈C15. 79 cm） to reveal structural diversity of the K. davidiana population in natural secondary community in Nanpan River basin. The results showed that： （1） K. davidiana population was randomly distributed （W= 0. 468） and moderately mixed by other species （M= 0. 480） with obvious diameter dif-ferentiation among individuals （U= 0. 472）. （2） Most big trees of the population were in a status of domi-nance （U= 0. 204） and moderate mixture （M= 0. 436） , and their distribution pattern had a state of random distribution （W = 0. 483）. （3） Small trees had a similar distribution pattern and mixture with the whole population. The most of the small trees belonged to the inferior individuals （U = 0. 75 - 1. 00）. The study suggested that the spatial structural diversities existed between K. davidiana and its adjacent populations, and it also could be found in K. davidiana population. It may imply that K. davidiana was in a stage of stable development.
出处
《西北植物学报》
CAS
CSCD
北大核心
2017年第7期1414-1421,共8页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家自然科学基金(31400542
31460196)
广西自然科学基金(2016GXNSFBA380233)
关键词
铁坚油杉
种群
空间结构
二元分布
结构多样性
Keteleeria davidiana
population
spatial structure
bivariate distribution
structural diversity
