Ecological diversity and pulp, seed and kernel production of the Baobab (Adansonia digitata) in Benin

This study was carried out in the Sudanian (9 degrees 45'-12 degrees N), Sudano-Guinean (7 degrees 30'-9 degrees 45' N) and Guinean (6 degrees 25' - 7 degrees 30' N) zones of Benin. The distribution and relative abundance of the baobab was studied by means of megatransects and by surveying a number of selected sites. In each zone, an estimate was made of pulp, seed and kernel production from 1200 fruits harvested from 30 individuals. In the Sudanian zone and in some regions of the Dahomey-Gap in the Guinean zone, a population density of 5 baobabs per km(2) was recorded. In the Guinean zone, a density of only 1 baobab per km2 was recorded. The baobab population's occurred on sandy soils in the Sudanian and Guinean zones and on sandy-clayey soils in the Sudano-Guinean zone. Flowering and fruiting of the baobab is seasonal. The morphology and productivity of individual baobabs varied significantly from one zone to another. The zones with high values of potential evaporation, rainfall, relative humidity, temperature, pH(water) and percentage of fine silt are associated with a low seed and fruit pulp production. The higher the pH(KCl), the percentage of total nitrogen, organic carbon and organic matter, the higher the number of seeds produced by an individual baobab. The higher the clay and crude silt content of the soil, the better the productivity.