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1.
Cette étude se focalise sur la vérification de l’hypothèse que l’altitude influence l’occurrence de la flore des Fougères et leurs alliées au sein de l’écosystème forestier des montagnes du Parc National de Kahuzi-Biega. Un échantillonnage de la végétation y a été effectué en considérant 24 parcelles localisées par paires le long de 12 transects installés entre 1278?m et 3123?m d’altitude. Les données obtenues ont été traitées par des méthodes statistiques, principalement la régression et des analyses multivariées. Au total, 157 espèces ont été recensées. Les résultats montrent que la richesse spécifique décroît linéairement avec l’augmentation de l’altitude à partir de 2600?m. Cette tendance prévaut à la fois dans les sites perturbés (R 2?=?0.58; P?R 2?=?0.81; P? This study concerns the hypothesis that altitude influences the occurrence of ferns and their allies in the forest ecosystem of the mountains in Kahuzi-Biega National Park. To obtain an inventory of the ferns and their allies, a sampling of the vegetation was made in 24 squares located in pairs along 12 transects lying between 1278 metres and 3123 metres altitude. The data were statistically analysed, mainly with regression methods and multivariate analysis. A total of 157 species were recorded. Species richness decreases in a linear way with higher altitude from 2600 metres. This tendency is observed in disturbed (R 2?=?0.58; P?R 2?=?0.81; P?相似文献   

2.
The objective of this study is to categorize the endogenous knowledge related to Syzygium guineense subsp. macrocarpum, a nectariferous plant in Benin, and to evaluate the impact of the use of different plant parts on its sustainability. The assessment of knowledge was based on the relative frequency of response, diversity index and equity index. In addition, the impact of different uses was measured by the degree of threat in the natural environment. Investigations identified many uses that have been categorized into 7 types, of which the most represented being energy (78%) and medicinal (51%). There is a significant variation in usage knowledge among ethnic groups (P-Value = 0.00). The degree of threat ranged from 15.17% to 46.39%. This study shows that S. guineense subsp. macrocarpum is a species for domestic, medicinal and oral use.  相似文献   

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