[ Phytodiversité ligneuse et état de conservation des forêts sacrées dans le Moyen-Chari et le Mandoul au sud du Tchad ]
Volume 38, Issue 3, January 2023, Pages 569–583
Goy SARADOUM1, Mbatal TINGANE2, Ibrahima ADAMOU3, and Guiguindibaye MADJIMBE4
1 Université de Sarh, Faculté des Sciences et Techniques (FAST), BP 105 Sarh, Chad
2 Université de Sarh, Faculté des Sciences Agronomiques et de l’Environnement (FSAE), BP 105 Sarh, Chad
3 Université de Ngaoundéré, Faculté des Sciences (FS), BP 456 Ngaoundéré, Cameroon
4 Université de Sarh, Faculté des Sciences Agronomiques et de l’Environnement (FSAE), BP 105 Sarh, Chad
Original language: French
Copyright © 2023 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.
This study is carried out in 5 relatively better preserved sacred forests and aims to evaluate the diversity and the potential for natural regeneration of the woody stratum. Flower and dendrometric surveys are carried out in 3 plots of 50 m x 50 m installed in each of the sacred forests randomly and according to the homogeneity of the vegetation. The Shannon diversity and Pielou equitability indices, as well as the ANOVA test, are calculated from the PAST 4.10 software, were used to assess floristic diversity; the ecological importance of species and families was assessed from the calculations of the Importance Value Indices (IVI). There are 72 species in 59 genera and 23 families. The values of the diversity indices are from 2.53 to 2.90 bits for the Shannon index; from 0.62 to 0.84 for the Equitability of Pielou. Density ranges from 448.00 to 1046.70 individuals/ha and basal area ranges from 639.16 m2/ha to 759 m2/ha per forest surveyed. The most regular species are Combretum collinum Fresen., Detarium microcarpum Guill. and Perr., Anogeissus leiocarpa (DC) Guill. and Perr., Vitellaria paradoxa C.F. Gaertn., Prosopis africana (Guill. and Perr.) Taub. The sacred areas of Hori and Koutou are in a better state of conservation. Regeneration is low and woody stands are subject to increased degradation due to anthropogenic pressure due to a loss of authority from traditional chiefs.
Author Keywords: sacred forests, Chad, woody diversity, regeneration, conservation.
Volume 38, Issue 3, January 2023, Pages 569–583
Goy SARADOUM1, Mbatal TINGANE2, Ibrahima ADAMOU3, and Guiguindibaye MADJIMBE4
1 Université de Sarh, Faculté des Sciences et Techniques (FAST), BP 105 Sarh, Chad
2 Université de Sarh, Faculté des Sciences Agronomiques et de l’Environnement (FSAE), BP 105 Sarh, Chad
3 Université de Ngaoundéré, Faculté des Sciences (FS), BP 456 Ngaoundéré, Cameroon
4 Université de Sarh, Faculté des Sciences Agronomiques et de l’Environnement (FSAE), BP 105 Sarh, Chad
Original language: French
Copyright © 2023 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
This study is carried out in 5 relatively better preserved sacred forests and aims to evaluate the diversity and the potential for natural regeneration of the woody stratum. Flower and dendrometric surveys are carried out in 3 plots of 50 m x 50 m installed in each of the sacred forests randomly and according to the homogeneity of the vegetation. The Shannon diversity and Pielou equitability indices, as well as the ANOVA test, are calculated from the PAST 4.10 software, were used to assess floristic diversity; the ecological importance of species and families was assessed from the calculations of the Importance Value Indices (IVI). There are 72 species in 59 genera and 23 families. The values of the diversity indices are from 2.53 to 2.90 bits for the Shannon index; from 0.62 to 0.84 for the Equitability of Pielou. Density ranges from 448.00 to 1046.70 individuals/ha and basal area ranges from 639.16 m2/ha to 759 m2/ha per forest surveyed. The most regular species are Combretum collinum Fresen., Detarium microcarpum Guill. and Perr., Anogeissus leiocarpa (DC) Guill. and Perr., Vitellaria paradoxa C.F. Gaertn., Prosopis africana (Guill. and Perr.) Taub. The sacred areas of Hori and Koutou are in a better state of conservation. Regeneration is low and woody stands are subject to increased degradation due to anthropogenic pressure due to a loss of authority from traditional chiefs.
Author Keywords: sacred forests, Chad, woody diversity, regeneration, conservation.
Abstract: (french)
Cette étude est menée dans 5 forêts sacrées relativement mieux conservées et vise à évaluer la diversité et les potentialités de régénération naturelle de la strate ligneuse. Des relevés floristiques et dendrométriques sont effectués dans 3 placettes de 50 m x 50 m installées dans chacune des forêts sacrées de façon aléatoire et en fonction de l’homogénéité de la végétation. Les indices de diversité de Shannon et d’équitabilité de Piélou ainsi que le test d’ANOVA sont calculés à partir du logiciel PAST 4.10, ont été utilisés pour évaluer la diversité floristique; l’importance écologique des espèces et des familles a été appréciée à partir des calculs des Indices de Valeur d’Importance (IVI). Il a été recensé 72 espèces réparties en 59 genres et 23 familles. Les valeurs des indices de diversité sont de 2,53 à 2,90 bits pour l’indice de Shannon; de 0,62 à 0,84 pour l’Equitabilté de Piélou. La densité varie de 448,00 à 1046,70 individus/ha et la surface terrière varie de 639,16 m2/ha à 759 m2/ha par forêt inventoriée. Les espèces les plus régulières sont Combretum collinum Fresen., Detarium microcarpum Guill. et Perr., Anogeissus leiocarpa (DC) Guill. et Perr., Vitellaria paradoxa C.F. Gaertn., Prosopis africana (Guill. et Perr.) Taub. Les aires sacrées de Hori et Koutou se présentent un meilleur état de conservation. Le taux de régénération est faible et les peuplements ligneux subissent une dégradation accrue due à la pression anthropique due à une perte d’autorité des chefs traditionnels.
Author Keywords: forêts sacrées, Tchad, diversité ligneuse, régénération, conservation.
How to Cite this Article
Goy SARADOUM, Mbatal TINGANE, Ibrahima ADAMOU, and Guiguindibaye MADJIMBE, “Woody plant diversity and conservation status of sacred forests in the Middle Chari and Mandoul In Southern Chad,” International Journal of Innovation and Applied Studies, vol. 38, no. 3, pp. 569–583, January 2023.
