摘要: |
十万大山是广西生物多样性热点区域之一,其主要植被类型是山地常绿阔叶林,为了解区域内山地常绿阔叶林的群落现状及优势种群结构的发展现状,该文以十万大山山地常绿阔叶林1 hm2固定监测样地中胸径≥1 cm的木本植物为研究对象,分析其物种组成、径级结构、树高结构和用g(r)函数分析优势种的空间分布格局。结果表明:(1)群落中胸径≥1 cm的木本植物共计7 517株,隶属52科108属153种;群落的优势种有云南桤叶树(Clethra delavayi)、银木荷(Schima argentea)、毛折柄茶(Hartia villosa)、红锥(Castanopsis hystrix)、黄杞(Engelhardtia roxburghiana)、罗伞树(Ardisia quinquegona)、鼠刺(Itea chinensis)、腺叶山矾(Symplocos adenophylla)、假杨桐(Eurya subintegra)、毛冬青(Ilex pubescens),但优势种的优势地位不明显。(2)群落整体平均胸径5.51 cm,径级、树高分布呈近似倒“J”型;优势种的径级分布多呈倒“J”型或“L”型,群落有较强的更新能力。(3)群落优势种稳定共存;优势种在样地中呈聚集分布,但优势种间聚集分布的位置有差异。总体上,群落目前更新状态良好,群落中已有顶极群落优势种的存在,但群落具有一定的次生性特征,还未到达稳定的顶极群落状态,优势种间能稳定共存,有向稳定顶极群落演替的潜力,应继续加强管护,促进十万大山山地常绿阔叶林群落的更新与生存。 |
关键词: 山地常绿阔叶林,物种组成,径级结构,空间分布格局 |
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基金项目:广西自然科学基金资助;广西林草种质资源普查与收集【桂林科字[2021]第34号】 |
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Species composition and structural characteristics of mountain evergreen broad–leaved forest community in Shiwandashan, Guangxi |
JIANG Dongdong1, LUO Yinghua2, HE Qiaoping1, QIN Lin1, LIN Jianyong3, LING Yaming4
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1.Forestry College of Guangxi University;2.Forestry College of Guangxi University,Nanning,LaiBin JinXiu DaYaoShan Forest Ecosystems Observation and Research Station of Guangxi;3.Guangxi Zhuang Autonomous Region Forestry Research Institute,Nanning,Guangxi;4.Fangchenggang Shiwandashan National Nature Reserve Administration Bureau,Fanagchenggang,Guangxi
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Abstract: |
Shiwandashan is one of the hotspots of biodiversity in Guangxi, and its main vegetation type is the mountain evergreen broad-leaved forest. In order to understand the current community status and the development status of dominant species population structure of mountainous evergreen broad-leaved forests in the region; This study was conducted in a fixed monitoring sample plot of 1 hm2 established within the evergreen broad-leaved forest community in the Shiwandashan. Woody plants with a diameter at breast height ≥ 1 cm in the sample plot community were used as the research object to analyze their species composition, diameter class structure, tree height structure, and the spatial distribution pattern of dominant species using the g(r) function. The results indicate that: (1) There are 153 species of woody plants with a diameter at breast height ≥ 1 cm in the community, belonging to 52 families and 108 genera. The individual density of the sample plot community is 7 517 plants/hm2; The dominant species in the community are Clethra delavayi, Schima argentea, Hartia villosa, Castanopsis hystrix, Engelhardtia roxburghiana, Ardisia quinquegona, Itea chinensis, Symplocos adenophylla, Eurya subintegra, Ilex pubescens; But the dominant position of dominant species is not obvious. (2) The overall average diameter at breast height of the community is 5.51 cm, and the distribution of diameter class and tree height is approximately an inverted "J" shape. The diameter class distribution of dominant species is mostly an inverted "J" or "L" shape, and the community has a large number of small and medium-sized diameter class standing trees, indicating a strong self-renewal ability of the community. (3) Dominant species coexist stably in the community; The dominant species exhibit aggregated distribution in the sample plot, but there are differences in the location of aggregated distribution among dominant species. Overall, the community is currently in a good state of renewal, with the existence of dominant species in the top level community. However, the community has certain secondary characteristics and has not yet reached a stable top level community state. The dominant species can coexist stably and have the potential to inherit towards a stable top level community. Therefore, it is necessary to continue to strengthen management and promote the renewal and survival of the evergreen broad-leaved forest community in the Shiwandashan areas. |
Key words: Mountain evergreen broad-leaved forest, Species composition, Diameter class structure, Spatial distribution pattern |