�TUDE QUANTITATIVE ET QUALITATIVE DE LA POLLUTION M�TALLIQUE ET MICROBIOLOGIQUE DES EAUX DE SURFACE, R�GION DE TAZA (MAROC).La pr�sente �tude constitue une analyse multidisciplinaire, men�e dans le bassin versant de l'Oued Larbaa qui occupe une superficie de 772,9 Km� et limit� par un p�rim�tre de 180,6 Km. Il s'ins�re dans le cadre de l'�tude et l'�valuation de la qualit� environnementale de l'Oued Larbaa et de ses affluents principaux (Oued Jaouna, Oued Dfali et Oued Taza), r�gion de Taza (Maroc). Elle a fait l'objet de cinq volets qui s'articulent autour de :- L'�valuation de la qualit� hydrochimique du milieu et son aptitude � l'irrigation.- L'�valuation de la qualit� physicochimique et min�ralogique des s�diments superficiels de l'Oued Larbaa.- L'estimation du degr� de contamination m�tallique des eaux et des s�diments.- L'�valuation de la qualit� microbiologique des eaux de surface de l'Oued Larbaa. - La r�partition des germes indicateurs d'une pollution microbienne en r�ponse aux diff�rentes perturbations de l'�cosyst�me.

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