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Detarium senegalense J. F.
Gmel., of the family of Fabaceae is one of the most exploited tree species in
Togo. However, there are only few scientific studies on the distribution of
this specie. This study is a contribution to the promotion of multi-purpose
tree species in Togo with particular emphasis on a better knowledge of Detarium senegalense. It provides data
on the ecology of the specie and his state of regeneration. The data on the
specie are based on sample plots in the areas identified as hosts of the specie
in Togo. A total of 77 circular plots of 1000 m2 (17.8 m radius)
were established in ecological zones II, IV and V of Togo. The dendrometric
parameters identified are: the total height and diameter at breast height (DBH)
of Detarium senegalense and of all
species found in each plot. Detarium
senegalense trees of DBH < 10 cm are considered as potential
regenerations. Detarium senegalense is
more abundant in zones IV (forest area), followed by zone II. In zone V, Detarium senegalense is located only in
the forest of “Have”. The structure of Detarium
senegalense has a bell-shaped distribution with predominance of trees with
large and intermediate diameters ranging between 30 and 70 cm. Trees of small
DBH (<30 cm) are often lacking in natural forest stands where Detarium senegalense occurs. This
indicates a low regeneration rate of the specie. However, the structure of all
species inventoried has a negative exponential distribution with predominance
of small diameter trees. The sustainable management of Detarium senegalense in the forest can
Nauclea diderrichii is a tropical African hardwood species and a suitable candidate for plantation development. However, attack by the Orygmophora mediofoveata, Hamps shoot borer threatens establishment of the species in plantations. A genotype * environment assessment of 15 N. diderrichii progenies from Ghana and Togo was conducted in the Wet Evergreen, Moist Semi-deciduous and Dry Semi-deciduous forest zones. Progeny performance (Attack intensity, survival and growth) varied significantly between sites, and marginally within sites after 2.7 years. Overall, incidence of shoot borer attack was lower at the wet zone than at the moist or dry zones. Percent survival was higher at the wet (79.5%) than at the moist (50.8%) or dry (55.0%) forest zones. Mean height across the 15 progenies was 5.40 m, 4.30 m, and 2.73 m at the wet, dry and moist forests, respectively. Similarly, mean diameter was 5.31 cm, 4.58 cm, and 2.83 cm at the wet, dry and moist zones, respectively. The relatively low growth rate recorded at the moist zone was attributed to the paucity of soil conditions at the experimental site. Three wet forest zone progenies (BS9, BS3 and BS2) and two moist forest zone progenies (BE2 and GA1) performed better than average and have been recommended for planting.
tropical forests spread from Senegal to Togo. They are considered as one of the
world biodiversity hotspots. But these forests are disappearing very quickly
because of human activities. In Togo, tropical forests degradation has been
increased since 1980 because of improved coffee cultivation; about 67% of
forests in the sub-humid mountains zone disappeared between 1978 and 2000.
Facing this fast deterioration of the forests, populations begin to plant teak
(an exotic species) that is the only choice proposed by local forest service.
This survey consists in valuing the potentialities to restore the Togolese
tropical forest using the local commercial species, recognized on the wood
market. The first species retained is Nauclea
diderrichii (De Wild. & Th. Dur.) Merrill, that spreads in the African
tropical forest from the Sierra Leonne to Uganda and through the Congo basin.
In Togo, this plant species colonises the plain of the Litimé. The objective of
the present study is to analyze the distribution of the natural populations in
the plain of Litimé forest but also natural and artificial regeneration of the
species. The perspective is to repeat this experiment with other local species
in other regions of Togo in order to diversify the plantations and to protect
the local forest biodiversity.