Study of the effects allelopathic of the exotic plants on natural regeneration. Case of Eucalyptus déglupta (B.), 1863, E. urophilla( S. T. B.), 1977, E. camaldulensis (D.), 1832, E. citriodora( H.), 1848, Pinus caribaea ( M.), 1851 et Gmelina arborea (R.), 1814 on the growth of Cesalpina pulcherima( L.), Sw., 1791, at hill of Gbazoubangui, (Central African Republic) (Published)
In the optics of stage to problems of deforestation and desertification in the threatened areas tropical, of monocultures of the species of the exotic plants are used in the natural environments. The objective of this study is to evaluate the impact of the pastes of the sheets of 4 species of Eucalyptus, of Pinus caribaea (Mr.) and of Gmellina arborea ( R.) on the growth of Cesalpina pulcherima (L.) and to check the influence of exudates roots of these plants in Co-culture with Cesalpina pulcherima (L.) a device of experimental culture was used, as well as a variance analysis (ANOVA) to a factor (test of Shapiro, P<0.005) and an analysis by a linear model generalized (GLM) with the distribution of errors of the family of Poisson for the analyses. All these tests have been carried out with the software R version 3.4.4. The results of the tests go up that the pastes of E. urophilla (S. T. B ), E. deglupta (B.) and E. camaldulensis (D.) significantly accelerate the growth in height of C pulcherima (L.), on the other hand the pastes of Ecitriodora (H.), no effect has. No effect on the diameter of the stems of C. pulcherima (L.), (ANOVA, P>0.05, n=40). A significant result of the growth with E. urophila (S;T.B.) .,< https://en.wikipedia.org/wiki/Stanley_Thatcher_Blake >. and G. arborea (R.) then no effect with P. caribaea (M.) No effect on the growth in thickness of the stems of C. pulcherima (L.), (ANOVA, P>0.05, n=40)..A significant inhibition of the growth in length of C pulcherina (L.) in Co-culture with E. deglupta (B.),P. caribaea (Mr.) and G. arborea (R.). Theaverage heights of C. pulcherina (L.) in Co-cultivated are significantly lower than that of the witness (P<0.005).
Keywords: Allelopathy, Central African Republic., Cesalpina pulchrima (L.) hill of Gbazoubangui, exotic plants