The natural regeneration of Isoberlinia doka Craib. & Stapf. in the Nazinon classified forest (Burkina Faso).

摘要

The mechanisms of the natural regeneration of Isoberlinia doka have been studied in the Nazinon forest, South of Ouagadougou (Burkina Faso). This species has been drastically vanishing in this area for a number of years. Given this context, the present study was carried out with the following objectives: to study the structure of the Isoberlinia doka population; to describe the organization of the soil surface; to describe the morphologic development of sexual regeneration; to assess the water content and the life expectancy of the seeds. Results show that Isoberlinia doka seeds with a water content of 15% of dry weight are recalcitrant. Seedlings are cryptogeal and they preferably and quickly develop a deep root down to a depth of 10 to 15 cm before the stem starts developing. They grow better on microsites with a good water balance. Dissemination under the mother tree and suckering encourage an aggregating distribution of the Isoberlinia doka population. The vertical structure has an "L" shape. For a better understanding of the sexual regeneration of Isoberlina doka, complementary studies need to be conducted..