The aim of this study was to assess the influence of some abiotic factors monitoring abundances of Pseudomonas aeruginosa, in open and closed wells in sandy and clayey-lateritic soils in Cameroon (Central Africa). In closed wells, the abundance of P. aeruginosa varied from 1 to 153 CFU/100 ml in sandy soil, and from 1 to 60 CFU/100 ml in clayey-lateritic soil. In open wells, it varied from 1 to 200 CFU/100 ml in sandy soil, and from 1 to 58 CFU/100 ml in clayey-lateritic soil. Abundances of P. aeruginosa underwent temporal variations in wells. Meteorological, physicochemical and hydrological factors impacts at different magnitudes the abundance dynamic of cells. Positive correlation (P<0.05) between rainfall and P. aeruginosa abundances were more observed in wells in clayey-lateritic soil than those of sandy soil. Lower cells abundances observed in some open wells were related to the high insolation periods (P<0.05). The hierarchical organization was made by expressing percentage and ranking in descending order of the mean of sum of squares of each MANOVA test factor showed that in open wells, the water electrical conductivity and alkalinity seems to be the main factors controlling the P. aeruginosa abundance dynamics in sandy soil whereas the total suspended solids seems the main factors in clayey-lateritic soils. In closed wells, this bacteria abundance dynamics seems to be mainly controlled by the dissolved oxygen and carbon dioxide content in clayey-lateritic soils whereas the main factors in sandy soil are the dissolved oxygen content and the well depth.
