A study on Iroko’s regeneration was done under four seed-trees (two in a young fallow and two in a secondary forest). The aim was to know ecological factors what are influencing his spatial distribution and ecological recruitment pattern of juveniles under its seed-trees. Under each seeder, eight directions were selected according to the wind rose on 1 ha. The light, slope, and litter thickness were measured over the eight directions divided into 5m x 3m plots. For each found juvenile, its high and distance to the seeder were measured. Seventy-three juveniles were found, 47 in the young fallow and 16 in the secondary forest. More juveniles were found in young fallow under seeder 2 (28 juveniles) and few juveniles under seeder 3 in the secondary forest (5 individuals). Means of 23.5 ± 4.5 and 8 ± 3 juveniles were found in young fallow and secondary forest respectively. The overall average of juveniles per seeder was 15.75 ± 7.75 juveniles.
This study aims to analyse spatial distribution and interactions that can exist between different Growth stages of Milicia excelsa (Iroko) and also, between its seedlings and adults of other species in order to provide to forest managers a tool for sustainable management of the natural population of this species. A full inventory was carried out in a semi-deciduous and anthropized forest of Central Africa in the north-east of DR Congo in six hectares with the Cartesian coordinates of all tree individual species taken. Data from this inventory were encoded and statistically analysed using the «ads» package of R Software to determine the point processes observed in this habitat. Results showed that Iroko trees have a random spatial distribution with low aggregations in the ecosystem. Individuals of the same growth stage live in aggregate while those of different growth stage have negative interactions (Competition - repulsion) on non-negligible radius. The diametric structure of its individuals is well balanced but showing a regeneration significantly low.
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