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首页> 外文期刊>Open Journal of Ecology >Floristic diversity and structural parameters of the Brazzaville Patte d’Oie forest, Congo
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Floristic diversity and structural parameters of the Brazzaville Patte d’Oie forest, Congo

机译：刚果布拉柴维尔帕特迪瓦伊森林的植物区系多样性和结构参数

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The flora of the Patte d’Oie forest of Brazzaville is studied according to three plots of 0.5 ha, corresponding each to one of the islet, currently constituting it. With an original area of 240 ha, put in reserve in 1938, the natural forest of the Patte d’Oie of Brazzaville covers 95 ha, less than 39% compared to initial area. Because the other main forests of Brazzaville have disappeared without delivering their biodiversity, this study is the first one which emphasizes the flora of this single ecosystem of Congo. The total floristic inventory revealed 459 trees of dbh≥10 cm on 1.5 ha; it is an average of 306 trees?ha?1. 31 species are listed for 17 families, and the best represented of which (Fabaceae, Euphorbiaceae and Rubiaceae) have a diversity varying from 13% to 19% of the inventory and a tree number oscillating from 15% to 36%. The Shannon (H') biological diversity index of the three plots is of 2.6 on average, for a maximum diversity (H'max) average of 2.9 versus an average true diversity of 15. The Pielou index is on average 0.9, whereas that of Simpson is 0.9. The coefficients of similarity of Jaccard (41.4% to 57.1%) and of the coefficient of S?rensen (58.5% to 72.7%) show the variations in the floristic composition. The followed ecological parameters show that this ecosystem is very few diversified compared to the tropical wet dense forests on the one hand, and, on the other hand, a non constant floristic composition is not. The analysis of the diametric structure by plot and the dominant and/or characteristic species give erratic curves, evidence of an insufficiency of the regenerative potential. Indeed, approximately 70% of the species are characteristic of the disturbed ecosystems (Macaranga sp.,Caloncoba welwitschii,Hymenocardia ulmoides,and Anthocleista sp.).
机译：根据三个面积为0.5公顷的地块研究了布拉柴维尔的Patte d'Oie森林的植物区系，每个地块对应于当前组成的一个小岛。布拉柴维尔Patte d'Oie的天然森林最初的面积为240公顷，于1938年投入储备，面积为95公顷，比初始面积少39％。由于布拉柴维尔的其他主要森林在没有传递其生物多样性的情况下消失了，因此本研究是第一个强调刚果单一生态系统植物区系的研究。植物区系总清单显示1.5公顷上的459dbh≥10cm的树木;平均每棵306棵树？ha？1。列出了17个科的31种，其中最有代表性的（Fabaceae，Euphorbiaceae和Rubiaceae）的多样性在种群总数的13％至19％之间不等，树数在15％至36％之间波动。这三个样地的香农（H'）生物多样性指数平均为2.6，最大多样性（H'max）平均为2.9，而平均真实多样性为15。皮娄指数平均为0.9，而辛普森是0.9。 Jaccard的相似系数（41.4％至57.1％）和S？rensen系数（58.5％至72.7％）显示出植物区系的变异。遵循的生态参数表明，一方面，与热带湿茂密森林相比，该生态系统几乎没有多样化，另一方面，植物区系不是恒定的。通过图和主要和/或特征种类对直径结构的分析给出了不稳定的曲线，表明了再生潜力不足。实际上，大约70％的物种是受干扰的生态系统的特征（Macaranga sp。，Caloncoba welwitschii，ulhyenocardia ulmoides和Anthocleista sp。）。

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