The aim of the present work was to evaluate the regeneration of Gilbertiodendron dewevrei in the Botanical garden of the Faculty of Science, University of Kisangani/DR Congo. 1.439 individuals were listed and gathered in various classes of size, diameter of stem and distribution around the carrying foot. 33 years after the establishment of this botanical garden, Gilbertiodendron dewevrei was transformed into a forest species. Indeed, it found ecological conditions similar to those of its medium of origin and which favor its optimal ex situ development. The individuals having the size ≤ 50 cm, are the most represented with 1055 individuals (73,3%) and numbers it individuals having a diameter ≤ 10 cm are higher with 1358 individuals (94,3%). The data on the carrying foot showed a good regeneration of the species. The number of individuals falls when classes progress in the ascending order. It is thus desirable that studies are regularly carried out on the species headlights of the botanical garden for a permanent follow-up of the evolution of their florula.
Democratic Republic of the Congo is among the countries who attach great importance to the conservation and sustainable management of natural resources. The aim of this floristic study was to evaluate the plant diversity of the Rubi-télé hunting area for a good sustainable management. This area is located in the Bas Uele province, Territory of Buta and the Community of Monganzulu village Sukisa (N: 02 ° 19 '072 "E: 024 ° 58' 368'; altitude: 471m). This reserve has an area of 9080 km2.
All individuals with a diameter ≥ 10 cm were inventoried and measured 1.30 m above the grade. We opted for a targeted sampling of delineating the 50 m X 50 m plots (mixed forest) and where the Gilbertiodendron dewevrei (mono forest dominant) was abundant. The study conducted in the field hunting Rubi-Télé an area of 2ha led us census 452 individuals in the mixed forest divided into 79 species, 28 families; 267 individuals in the forest Gilbertiodendron dewevrei divided into 30 species, 14 families.
Basal area for forest Gilbertiodendron dewevrei is 32,3m2/ha and mixed forest as basal area 23m2/ha. Julbernadia seretii is more abundant with a rate of 11.95%, in the mixed forest. Family Fabaceae leads with 30.87%.
For Gilbertiodendron dewevrei forest species abounds its habitat, first with 46.44% of the family Fabaceae is leading with 64.12%, it appears that the mixed forest shows the scattering of the forest wealth specific Gilbertiodendron dewevrei because its diversity index values are low.
An ecological study based on the natural regeneration of the undergrowth was carried out in the S. Lisowski botanical garden of the Faculty of Science, Kisangani University. A floristic inventory was conducted taking into account the height and diameter of all individuals. From this inventory, 3901 individuals have been recorded and grouped into 6 species, 6 genera, and 5 families; for the species assessed according to the scale of abundance – dominance of BRAUN BLANQUET, 8 species grouped into 8 genre and 7 families were counted. The obtained result show the dominance of the Leptonychia tokana (1232 feet or 31.58%) species, followed by Costus lucanusianus (881 individuals or 22.58%) and finally Tricalysia bequaertii (741 feet or 18, 29%). Among the Spectra evaluated according to the scale of abundance-dominance of BRAUN BLANQUET, Trachyphrynium braunianum and Anthurium ferrierense are the most abundant. The most represented families in the undergrowth of the garden are the Rubiaceae, Marantaceae, Malvaceae and Costaceae.
The present work carried out in Masako forest reserve, updates the data on regeneration of Gilbertiodendron dewevrei through its youthful (1 ≤ dbh < 10 cm). To carry out our study, twelve 50 m × 50 m plots were established on a 2100 m transect in G. dewevrei based mono-dominant forest. The aim in view was to see how is held the regeneration of this last through its youthful in the Masako forest reserve. We hypothesized that the youthful ones would develop under canopée in a uniform way in all the pieces. To this end, 1652 individuals grouped in five diameter classes : class 1 with 1364 individuals (83%), followed by class 2 with 241 individuals (15%), class 3 with 34 individuals (2%), class 4 with 9 individuals (1%) and then class 5 with 4 individuals (0.2%). This result shows that regeneration of G. dewevrei at youthful stage is not uniform, according to their heterogeneous distribution (Coefficient of variation: 63.5%). Individuals in classes 4 and 5 are less represented because they are exploited much by the local community for the building work.