Variabilité Structurale Des Peuplements D’arbres En Forêt De Montagne Du Parc National De Kahuzi-Biega Et Ses Environs, RD. Congo

Abstract

This work aims to determine the change in the diametric structure, density, basal area, height and dominance of trees dbh ≥ 10 cm depending on altitude range or forest types. The study was conducted in 30 ha in Kahuzi Biega National Park and surrounding areas in DR Congo. In total, 16,797 individual trees were surveyed. The number of family, genus and species regress following the altitudinal gradient as the density increases. Mountain ecosystems in Kahuzi-Biega and its surroundings are dominated by Meliaceae, Euphorbiaceae, Moraceae, Fabaceae and Rubiaceae families. The Chi square analysis showed that the diametric structure of vegetation European Scientific Journal August 2016 edition vol.12, No.23 ISSN: 1857 -7881 (Print) e -ISSN 1857 89 succession following a progressive dynamic and varies according to altitude gradient. The average basal area was 35 m²/ha. The analysis of variance (ANOVA) and post hoc Tukey test does not prove the impact of altitude on the basal area. But it becomes low in elevation due to the reduced diameter of the trees. The vertical structure was analyzed according to the classification IUFRO (International Union of Forest Research Organizations). The maximum height was 48 m and becomes lower in altitude. The tree height diameter relationship varies according altitude range so that the models H/D in this area should be developed for each forest type. We determine that the dominance of woody species following the altitude effect; only Strombosia scheffleri and Xymalos monospora dominated by its basal area, abundance and frequency of the various altitude horizons.

Evolution of Floristic Composition and Structural Parameters between Two Management Inventories in a Tropical Forest in the East Cameroon Region

“…Indeed, the density is higher in the "Amé" zone (140 stems/ha) followed by the NonAme zone (132 stems/ha) and lower in the "NonExpl" zone (127 stems/ha) under the first inventory. This variation in distribution could reveal the fact that the operator favors the richest areas for exploitation during the plot and the provisional agreement (Gérard et al, 2016).…”

“…It is essential in the framework of the revi- Questions remain on the effectiveness of reconstitution formulas, the maintenance of diversity indices and other parameters such as density, basal area and diameter structure in a perspective of the implementation of sustainable forest management (Bolia et al, 2019). Studies on the variability of forest structure and diversity between different sites of the same forest according to local conditions are rare and poorly documented (Gérard et al, 2016). However, these parameters are essential in determining the indicators of the dynamics of forest ecosystems, an essential basis in their development.…”