Conference Paper

Dendrometrical Characterization of a Common Plant Species (Anogeissus leiocarpa (DC.) Guill. & Perr.) in Pendjari Biosphere Reserve and its Surrounding Land (Benin).

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... Uncontrolled fires could be another reason as trees with one single trunk like P. erinaceus are more sensitive to fire impact than shrubby species like the Combretaceae, that more easily sprout after fire impact (Brookman-Amissah et al., 1980). The mean diameter of A. leiocarpa was slightly higher than those from similar studies in the Pendjari Biosphere Reserve in northern-Benin (Houéhanou et al., 2007), but smaller than those calculated for the species in Wari Maro in the centre of Benin ). ...
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This study aims to assess population structure and ecological indicators of woodland vegetation dominated by Pterocarpus erinaceus and Anogeissus leiocarpa as a basis for sustainable management and conservation strategies. We sampled 34 plots each measuring 30 m × 30 m in W National Park in Niger and analyzed structural parameters (tree density, basal area, Lorey's mean height and size class distribution) and ecological indicators (species richness, Shannon diversity index, Pielou evenness index and Importance Value Index) of woodland in general and for the two key species. Mean tree density was 752.6 stems/ha and basal area was 24.5 m²/ha in woodlands including 145.4 stems/ha and 14.1 m²/ha for A. leiocarpa and 3.3 stems/ha and 0.7 m²/ha for P. erinaceus. The woodland was composed of 59 tree species belonging to 34 genera and 17 families. A. leiocarpa had the highest IVI value (0.93), whereas P. erinaceus was among the species with the lowest IVI value (0.03). The mean diameter of both species was higher (24 cm and 47 cm for A. leiocarpa and P. erinaceus respectively) than the mean diameter in woodlands (16 cm). A “reverse J” shape distribution was found for woodland in general and for A. leiocarpa, but P. erinaceus showed a left dissymmetric distribution. Findings of this study showed that urgent actions are needed for sustainable management and conservation of some key species especially P. erinaceus.
... The exact mechanism of antimalarial action of flavonoids is unclear but some flavonoids are shown to inhibit the influx of L-glutamine and myoinositol into infected erythrocytes 5 . Exiguaflavanone A and exiguaflavanone B from Artemisia indica exhibited in vitro antiplasmodial activities (IC 50 = 4.6 and 7.0 µg/mL) respectively 6 10,11 . Its Leaves are used in Nigeria and in Guinea as antimalarial 12,13 . ...
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Anogeissus leiocarpus Guill. & Perr. (Combretaceae) is an African indigenous tree. It has been of interest to researchers because it is used in Ivory Coast as antimalaria remedy. The in vitro antiplasmodial and antileishmanial activities of the leaf and it major constituents are investigated her for the first time. Chemical composition of ethyl acetate crude extract was analyzed by NMR (1D and 2D), LC–ESI-MS and HPLC reverse phase methods. Results demonstrated that ethyl acetate crude extract from A. leiocarpus presented in vitro antiplasmodial and antileismanial activities (IC 50 : 10 and 25 µg/ml respectively). Eight flavonoids were isolated, among which Procyanidin B2 (8) and Quercetin (3), that showed antiplasmodial activity with IC 50 value of 5.3 and 6.6 µM respectively. With the antileishmanial activity, the best IC 50 value was obtained with Rutin (5) (IC 50 =1.6 µM). Cytotoxicity was also made. These findings demonstrate that the leaves of A. eliocarpus are a reach source of flavonoids with potential antileismanial and antiplasmodial properties. Investigations of this species are in progress for other medicinal properties.
... Bayer & Water-Bayer (1999) noted that pruning strongly influences the quantity of leaves and interferes with the growth of trees. In the present study however, the dendrometric parameters calculated both in low-and high-pressure stands were slightly superior to the ones computed for the same species in the Pendjari Biosphere Reserve in northern Benin (Houehanou et al., 2007). Mean diameter was 17.8 cm in the reserve, while mean height was 9.5 m. ...
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The present study focused on the analysis of the structure of the Anogeissus leiocarpa dominated natural stands in the Wari-Maro forest reserve which are under high and minimal anthropogenic pressures. These stands were considered for forest inventories after carrying out a random sampling scheme of 40 sample units of 30 m × 50 m. In each level pressure stand, the dbh and tree-height of identified tree-species were measured in each plot. Data analyses were based on the computation of structural parameters, establishment of diameter and height distributions and the floristic composition of the two types of stands. Results obtained showed higher values for the overall basal area (9.78 m2 ha-1), mean height (22.37 m) and mean diameter (36.92 cm) for A. leiocarpa in low-pressure stands. In high-pressure stands, some species like Afzelia africana had lower Importance Value Index and the frequency of A. leiocarpa trees in the successive diameter classes dropped rapidly and the value of the logarithmic slope of the height-diameter relationship was lower (9.77) indicating a lanky shape. Results obtained suggest that effective conservation is needed for A. leiocarpa stands under high pressure by limiting human interference and developing appropriate strategy for restoration purposes. © 2009 The Authors. Journal compilation
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