Analysis of the floristic composition of the Brazilian cerrado vegetation II: Comparison of the woody vegetation of 98 areas
Analysis of the floristic composition of the Brazilian cerrado vegetation II: Comparison of the woody vegetation of 98 areas
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巴西塞拉多植被植物区系组成分析二：98个地区木本植被比较
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
J. F. Ribeiro
中科院分区：
文献类型：
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作者：
J. Ratter;S. Bridgewater;R. Atkinson;J. F. Ribeiro
对塞拉多和亚马逊稀树草原 98 个地区的植物区系组成进行了分析，这些地区涵盖了巴西此类植被的大部分地区。这些地区总共记录了 534 种树木和大型灌木，其中 158 种（30%）仅出现在一个地点。这些没有确定具体水平的单科动物和类群被排除在研究之外，因为它们不提供比较基础。通过三种多变量分析技术对数据进行分析：（a）通过双向指标物种分析（TWINSPAN）进行分裂层次分类。 (b) 使用 Sorensen 社区系数 (CC) 作为相似性度量，通过 UPGMA（使用算术平均的未加权配对方法）进行凝聚层次分类，以及 (c) 通过去趋势对应分析 (DCA) 进行排序。所有三种方法的结果都显示出极大的相似性，表明塞拉多生物群落的植物区系分布具有很强的地理模式，并允许识别南部（圣保罗和南米纳斯吉拉斯州）、东南部（主要是米纳斯吉拉斯州）、中部（联邦区、戈亚斯州和米纳斯吉拉斯州部分地区）、中西部（主要是马托格罗索州、戈亚斯州和南马托格罗索州）和北部群体（主要是米纳斯吉拉斯州）。马拉尼昂 (Maranhao)、托坎廷斯 (Tocantins) 和帕拉 (Para)，以及亚马逊稀树草原的分离群。土壤类型（中营养或营养不良）是决定植物区系组成的重要因素。研究表明，塞拉多植被极其异质：534 个物种中没有一个物种出现在所有地点，只有 28 个物种的存在率达到 50% 或以上。
An analysis was made of the floristic composition of 98 areas of cerrado and Amazonian savanna, encompassing most of the area of such vegetation in Brazil. A total of 534 species of trees and large shrubs were recorded for these areas, of which 158 (30%) occurred at a single site only. Such unicates and taxa without determinations to specific level were excluded from the study since they provide no basis for comparison. The data were analysed by three techniques of multivariate analysis: (a) a divisive hierarchical classification by Two-way Indicator Species Analysis (TWINSPAN). (b) an agglomerative hierarchical classification by UPGMA (Unweighted Pair-Groups Method using Arithmetic Averages) using the Sorensen Coefficient of Community (CC) as a measure of similarity, and (c) an ordination by Detrended Correspondence Analysis (DCA). The results from all three methods showed great similarity, demonstrating a strong geographic pattern in the distribution of the flora of the cerrado biome and allowing the recognition of southern (Sâo Paulo and S Minas Gerais), southeastern (largely Minas Gerais), central (Federal District, Goias and parts of Minas Gerais), central-western (largely Mato Grosso, Goias and Mato Grosso do Sul) and northern groups (principally Maranhao, Tocantins and Para), as well as a disjunct group of Amazonian savannas. Soil type (mesotrophic or dystrophic) is an important factor in determining floristic composition. The study demonstrated that cerrado vegetation is extremely heterogeneous: none of the 534 species occurred at all sites and only 28 species were present at 50% or more.