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Phytoosociology of floristic groups in subtropical seasonal forests in the south extreme of the Atlantic Forest Biome

机译:大西洋森林生物群落南端的亚热带季节性森林植物群落的植物群落学

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This study aimed to differentiate the structure and flora of tree component groups of a stretch of forest at the southern end of the Atlantic Forest biome, Rio Grande do Sul. For sampling the tree layer (diameter at breast height ≥ 5.0 cm), 18 plots of 20 m × 10 m were systematically installed. Data were analyzed according to the structure and diversity of vegetation using the agglomerative hierarchical cluster analysis method with Ward linkage, and the quadratic Euclidean distance to measure dissimilarity. The formation of three groups of flora was evident. The species composition of each group belonged to different stages of natural succession. Group I had the highest species richness (42 species) and the highest species diversity (2.92 nats ind. -1 ). The species with the highest importance value index (IVI) were: in Group I, Actinostemon concolor (14.7%), Trichilia claussenii (VI = 9.8%), and Apuleia leiocarpa (8.9%); in Group II, Trichilia claussenii (21.2%), Sorocea bonplandii (18.1%), and Trichilia elegans (17.6%); and in Group III, Allophylus edulis (12.1%), Cupania vernalis (9.6%), and Trichilia claussenii (9.4%). The three groups showed a negative exponential diameter distribution, common in forests with auto-regeneration capacity.
机译:这项研究的目的是区分南大西洋里奥格兰德生物群系南端一片森林的树组成群的结构和植物区系。为了采样树木层(胸高≥5.0 cm的直径),系统地安装了18个20 m×10 m的样地。使用带沃德链的聚类层次聚类分析方法,根据植被的结构和多样性对数据进行分析,并使用二次欧氏距离来测量差异。三组植物群的形成是明显的。每一组的物种组成属于自然演替的不同阶段。第一组具有最高的物种丰富度(42种)和最高的物种多样性(2.92 nat ind。-1)。具有最高重要性指数(IVI)的物种为:在第一组中,中华猕猴桃(14.7%),克氏紫锥虫(VI = 9.8%)和毛果apuleia(8.9%)。在第II组中,克氏紫锥虫(21.2%),邦氏Sorocea bonplandii(18.1%)和秀丽线虫(Trichilia elegans)(17.6%);在第三组中,可食的变色藻(Allophylus edulis(12.1%),Cupania vernalis(9.6%)和Trichilia claussenii(9.4%)。这三组显示负指数直径分布,常见于具有自动再生能力的森林。

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