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神农架南坡小叶青冈+曼青冈常绿阔叶林物种组成与群落结构

Species composition and community structure of broad-leaved evergreen forests of Cyclobalanopsis myrsinifolia Blume+Cyclobalanopsis oxyodon Miq. on the southern slopes of Shennongjia

  • 摘要: 本研究在神农架南坡建立1 hm2的常绿阔叶林动态监测固定样地,分析了该群落的物种组成、区系特征、垂直结构、径级结构和空间分布格局。结果显示,群落物种丰富,共调查到维管植物216种,隶属78科154属,其中胸径≥1 cm的木本植物38科69属107种。区系成分中,热带分布的科、属分别占总科、属数的50.00%和40.58%;温带分布的科、属分别占总科、属数的34.21%和53.63%。常绿树种占比55.14%(59种),落叶树种占比44.86%(48种),其中常绿树种的多度、胸高断面积和重要值占比分别为82.23%、64.79%和73.03%。偶见种占比33.64%(36种),稀有种占比8.41%(9种)。群落垂直结构明显,可分为乔木层、灌木层和草本层,各个层次物种丰富。径级结构呈倒“J”型,属于增长型群落。优势种的空间分布呈现出不同程度的聚集分布。研究表明,该群落的常绿树种重要值明显高于落叶树种,属于小叶青冈(Cyclobalanopsis myrsinifolia Blume)+曼青冈(Cyclobalanopsis oxyodon Miq.)群系,是该区域代表性的常绿阔叶林。区系成分体现出神农架作为中亚热带和北亚热带分界线的特征。群落有着较好的更新能力,呈现向常绿阔叶林顶极群落演替的趋势。

     

    Abstract: This study established a 1-hm2 fixed plot for dynamic monitoring of broad-leaved evergreen forest on the southern slopes of Shennongjia to examine the species composition, floristic characteristics, vertical structure, diameter class structure, and spatial distribution pattern of this community. Results revealed high species richness, with a total of 216 vascular plant species identified, belonging to 78 families and 154 genera. Of these, 107 species were woody plants with a diameter at breast height (DBH)≥1 cm, distributed across 38 families and 69 genera. In terms of floristic composition, families and genera with tropical distribution accounted for 50.00% and 40.58% of the total, respectively, while those with temperate distribution accounted for 34.21% and 53.63%, respectively. Evergreen tree species accounted for 55.14% (59 species), while deciduous tree species accounted for 44.86% (48 species), with the dominance, basal area, and importance values of evergreen tree species being 82.23%, 64.79%, and 73.03%, respectively. Occasional species accounted for 33.64% (36 species) and rare species accounted for 8.41% (nine species). The vertical structure of the community was well-defined, with distinct tree, shrub, and herb layers, each exhibiting high species richness. The diameter class structure exhibited a reverse "J" shape, indicative of a growth-type community. Spatially, dominant species showed varying degrees of clustered distribution. This study indicated that the importance value of evergreen tree species in the community was significantly higher than that of deciduous tree species, belonging to the Cyclobalanopsis myrsinifolia Blume+Cyclobalanopsis oxyodon Miq. community, representing a typical evergreen broad-leaved forest in the region. The floristic composition reflects the characteristics of Shennongjia as the boundary between the subtropical and north subtropical zones. The community demonstrates robust regenerative capability, indicating a successional trajectory toward climax evergreen broad-leaved forests.

     

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