[ Caractéristiques physionomiques et pédo-morphologiques des groupements végétaux de forêts denses de UMA en République démocratique du Congo ]
Volume 30, Issue 2, May 2017, Pages 119–136
Jean-Paul K. Shaumba1, Jean LEJOLY2, Hyppolite S.M. Nshimba3, M.B. Ndjele4, and Koto-te-Nyiwa Ngbolua5
1 Faculté des Sciences, Université de Kisangani, RD Congo
2 Herbier de l'Université Libre de Bruxelles C.P. 169, Avenue F. Roosevelt, 50. 1050 Bruxelles, Belgium
3 Faculté des Sciences, Université de Kisangani, RD Congo
4 Faculté des Sciences, Université de Kisangani, RD Congo
5 Département de Biologie, Faculté des Sciences, Université de Kinshasa, BP 190 Kinshasa XI, RD Congo
Original language: French
Copyright © 2017 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The present study was undertaken with the aim of to characterize, according to physiognomic point of view, the vegetation communities in the UMA forest and to evaluate the influence of physico-chemical and pedo-morphological parameters in the spatial organization of floristic diversity in the UMA forest. Five vegetation communities were identified in the UMA forest which sharing many common species. The restriction of certain species of plots belonging to the diameter class ≥ 50 cm show a variation even on the level of arborescent layers in this forest. The floristic variability is mainly explained by the soil humidity in the Limbali mono-dominant vegetation communities in the western part. In the easten part, it is explained by the pH, the conductivity and the soil depth in the heterogeneous vegetation communities. However, in the transition forest, it is explained by the retention of the soil phosphorus. The UMA forest is classified among the semi-deciduous dense heterogeneous forests. The identified vegetation communities are inserted in the alliances Gilbertiodendrion Devred 1958 and Oxystigmo-Scorodophleion Lebrun & Gilbert 1954 in the class of Strombosio-Parinarietea Lebrun & Gilbert 1954. The Guinean-Congolese element represents more than 82% of listed species, of which the endemic species of the center of Guinean-Congolese endemism accounts for at least 90% of species. The presence of Afro-American elements (2%) shows stochastic transgression. The sedentary species are abundant in the plant communities of the Western part, while the pioneers and cicatricial species are abundant in the plant communities of the Eastern part.
Author Keywords: Ecological niche, chorological characters, phytosociological taxonomy, Tshopo, Democratic Republic of the Congo.
Volume 30, Issue 2, May 2017, Pages 119–136
Jean-Paul K. Shaumba1, Jean LEJOLY2, Hyppolite S.M. Nshimba3, M.B. Ndjele4, and Koto-te-Nyiwa Ngbolua5
1 Faculté des Sciences, Université de Kisangani, RD Congo
2 Herbier de l'Université Libre de Bruxelles C.P. 169, Avenue F. Roosevelt, 50. 1050 Bruxelles, Belgium
3 Faculté des Sciences, Université de Kisangani, RD Congo
4 Faculté des Sciences, Université de Kisangani, RD Congo
5 Département de Biologie, Faculté des Sciences, Université de Kinshasa, BP 190 Kinshasa XI, RD Congo
Original language: French
Copyright © 2017 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The present study was undertaken with the aim of to characterize, according to physiognomic point of view, the vegetation communities in the UMA forest and to evaluate the influence of physico-chemical and pedo-morphological parameters in the spatial organization of floristic diversity in the UMA forest. Five vegetation communities were identified in the UMA forest which sharing many common species. The restriction of certain species of plots belonging to the diameter class ≥ 50 cm show a variation even on the level of arborescent layers in this forest. The floristic variability is mainly explained by the soil humidity in the Limbali mono-dominant vegetation communities in the western part. In the easten part, it is explained by the pH, the conductivity and the soil depth in the heterogeneous vegetation communities. However, in the transition forest, it is explained by the retention of the soil phosphorus. The UMA forest is classified among the semi-deciduous dense heterogeneous forests. The identified vegetation communities are inserted in the alliances Gilbertiodendrion Devred 1958 and Oxystigmo-Scorodophleion Lebrun & Gilbert 1954 in the class of Strombosio-Parinarietea Lebrun & Gilbert 1954. The Guinean-Congolese element represents more than 82% of listed species, of which the endemic species of the center of Guinean-Congolese endemism accounts for at least 90% of species. The presence of Afro-American elements (2%) shows stochastic transgression. The sedentary species are abundant in the plant communities of the Western part, while the pioneers and cicatricial species are abundant in the plant communities of the Eastern part.
Author Keywords: Ecological niche, chorological characters, phytosociological taxonomy, Tshopo, Democratic Republic of the Congo.
Abstract: (french)
Le présent travail a été réalisé dans le but de caractériser du point de vue physionomique, les groupements végétaux dans la forêt de UMA et d’évaluer l’influence des paramètres physico-chimiques et pédo-morphologiques dans l’organisation spatiale de la diversité floristique dans cette forêt. Cinq groupements végétaux ont été identifiés dans la forêt de UMA partageant un grand nombre d’espèces communes. La restriction de certains groupes des relevés appartenant à la classe de diamètre ≥ 50 cm montre une variation même au niveau de strates arborescentes dans cette forêt. La variabilité floristique est principalement expliquée par l’humidité du sol dans les groupements végétaux mono-dominants à Limbali à l’Ouest. À l’Est, elle est expliquée par le pH, la conductivité et la profondeur du sol dans les groupements végétaux hétérogènes. Cependant, dans la forêt de transition, elle est expliquée par la rétention du phosphore du sol. La forêt de UMA est classée parmi les forêts hétérogènes denses semi-decidues. Les groupements végétaux qui y sont identifiés sont insérés dans les alliances Gilbertiodendrion Devred 1958 et Oxystigmo-Scorodophleion Lebrun et Gilbert 1954 dans la classe Strombosio-Parinarietea Lebrun & Gilbert 1954. L’élément guinéo-congolais représente plus de 82% d’espèces recensées, dont l’espèce endémique du centre d’endémisme guinéo-congolais représente au moins 90% d’espèces. La présence d’éléments Afro-américains (2%) démontre de la transgression stochastique. Les espèces sédentaires sont abondantes dans les groupements végétaux de l’Ouest, tandis que les espèces pionnières et cicatricielles sont abondantes dans les groupements de l’Est.
Author Keywords: Niche écologique, caractères chorologiques, taxonomie phytosociologique, Tshopo, République démocratique du Congo.
How to Cite this Article
Jean-Paul K. Shaumba, Jean LEJOLY, Hyppolite S.M. Nshimba, M.B. Ndjele, and Koto-te-Nyiwa Ngbolua, “Physionomical and pedo-morphogical charasteristics of vegetation communities of UMA dense forests in the Democratic Republic of the Congo,” International Journal of Innovation and Scientific Research, vol. 30, no. 2, pp. 119–136, May 2017.
