The plant diversity of wetlands was analysed by two principal descriptors which are the bioclimate and the anthropic action. The impact of these factors was widely expressed by degradation and rapid substitution of the rug vegetal species. Dominated by the mediteranean elements (42%), that relatively poor flora (A total of 131species) was biologically characterized by a neat abundance of Therophytes (39%), the Chamaephytes (29%), the Hemicryptophytes (15%) and Geophytes (11%) to the detriment of the Phanerophytes (5%). The interpretation of the vegetation by the relevance factors has permitted to define the affinities between the different groups. This multidimensional treatment demonstrated the major importance of the anthropic and the bioclimatic factors that govern this dynamic. At the end of this study, the degradation of the soil privileged has been demonstrated by the anthropozoic action and the smaller amount of rain that caused the therophytisation; consequently, the quality of the soil could be described.
Key words: Plant diversity, flora, relevance factor, bioclimate, anthropic action.
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