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Ordination And Classification In The Savanna Vegetation Of The Akagera Park (Rwanda, Central Africa)

G. Bouxin
Published 1975 · Biology

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Quantitative data of habitat and vegetation from 70 relevés of the Akagera park were submitted to different ordination and classification methods. Sampling problems have been treated as objectively as possible. The habitat factors which have an important effect upon vegetation are: — the characteristics of adsorbant complex of soil, — the characteristics of the tree layer, — the texture of soil. the characteristics of adsorbant complex of soil, the characteristics of the tree layer, the texture of soil. The different ordination and numerical classification methods applied to the same set of data lead to consistent results. The numerical classification is preferred to Braun-Blanquet's method. The results are compared with the previous findings in the same region and the future developments of quantitative methods are discussed. Des données quantitatives sur le milieu et la végétation de 70 relevés du parc de l'Akagera ont été soumises à différentes méthodes d'ordination et de classification. Les problèmes d'échantillonnage ont été traités de façon aussi objective que possible. Les facteurs du milieu qui ont une action importante sur la végétation sont: — les caractéristiques du complexe adsorbant du sol, — les caractéristiques de la strate ligneuse, — la texture du sol. les caractéristiques du complexe adsorbant du sol, les caractéristiques de la strate ligneuse, la texture du sol. Les différentes méthodes d'ordination et de classification numérique appliquées au même ensemble de données conduisent à des résultats compatibles. La classification numérique est préférée à la méthode de Braun-Blanquet. Les résultats sont comparés aux conclusions obtenues précédemment dans la même région et les développements futurs des méthodes quantitatives sont discutés.
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