ABSTRACT
The studies of regeneration dynamics in tropical forests
continue to be insignificant despite the progress scientific research, leaving
that area of study little misunderstood. The present work examines forest
regeneration in the Okapi Wildlife Reserve, located in the province of Ituri in
the Democratic Republic of the Congo. Its aim was to gather reliable
information on the dynamics of regeneration of abundant tree species in the
permanent forest plots of the Okapi Reserve in the Ituri Forest.
The results obtained on two plots of 20 hectares each for two
successive periods of inventory (1996-2001 and 2001-2007) yielded 54,267
saplings belonging tothirty-seven (37) species. There were 33,752 and 20,515
individuals in Edoro and Lenda, respectively. Shade-tolerant species had a
higher density (abundance) in both study sites and were followed by
light-demanding species,non-pioneer light-demanding species exhibited the
lowest densities.
Measured demographic parameters revealed that the mortality
and recruitment were low in the permanent plots of the Ituri Forest. Mortality
rates variedfrom0.009% to 0.42% and recruitment rates from 0.006% to 0.034%.
Both rates werehigher among light demanding species than other functional
groups.
Population change of the regeneration of abundant species of
the Reserve Okapi minimal throughout the inventory periods. A small increase
was made in the 1996-2001intervalat theEdoro site.
Finally, the wood density of abundant species of Okapi
Wildlife Reserve has no significant impact on the demographic parameters
analyzed in this work, although mortality and recruitment slightly decreased
with increasing wood density.
Keywords: Dynamics, Regeneration, Ituri
Forest, shade tolerant, light demanding, non-pioneer light demanding
vi
Dynamique de la régénération des
espèces abondantes des forêts de l'Ituri : Cas des dispositifs
permanents de
la Réserve de faune à
Okapi
(c)Fiston Ngongo
LISTE DES FIGURES
Figure 2.1. La carte de la Réserve de faune à Okapi
. 9
Figure 3.1. Abondance (individus/ha) de la
régénération des espèces selon les
tempéraments
dans les deux sites 12
Figure 3.2. Corrélation entre le taux de mortalité
de la régénération et la densité du bois des
espèces dans les deux parcelles permanentes de la Reserve de Faune
à
Okapis . 15
Figure 3.3. Corrélation entre le taux de recrutement de la
régénération et la densité du bois des
espèces dans les deux parcelles permanentes de la Reserve de Faune
à
Okapis 16
Figure 3.4. Corrélation entre le taux de changement de
population de la régénération et la densité du bois
des espèces dans les deux parcelles permanentes de la Reserve de
Faune à Okapis 17
vii
Dynamique de la régénération des
espèces abondantes des forêts de l'Ituri : Cas des dispositifs
permanents de
la Réserve de faune à
Okapi
(c)Fiston Ngongo
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