Assessment of nitrogen and phosphate balance and the roles of bacteria and viruses at the water-sediment interface in the Allal El Fassi reservoir (Morocco) - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Environmental Monitoring and Assessment Année : 2014

Assessment of nitrogen and phosphate balance and the roles of bacteria and viruses at the water-sediment interface in the Allal El Fassi reservoir (Morocco)

Mohamed Alaoui-Mhamdi
  • Fonction : Auteur
Amel Dhib
  • Fonction : Auteur
  • PersonId : 773006
  • IdRef : 223402699
Abderrahim Bouhaddioui
  • Fonction : Auteur
Boutheina Ziadi
  • Fonction : Auteur
Souad Turki
  • Fonction : Auteur
Lotfi Aleya
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  • PersonId : 865719

Résumé

Balances of nitrogen and phosphate were studied in the Allal El Fassi reservoir (Morocco); the results showing that nitrogen input (296 mg m−2 d−1) was 161 % higher than output (183 mg m−2 d−1). Phos-phate input (35.65 mg m−2 d−1) was 865 % higher thanoutput (4.12 mg m−2 d−1), causing a progressive increase in the internal phosphate stock. Sedimentation flux was equally high (53.80 and 18 mg m−2 d−1) for both nitrogen and phosphate input, mainly from the Sebou River and in particulate form which immediately settles upon arrival in the reservoir. The release of nitrogen and phosphate from the sediment (5.40 and1.15 mg m−2 d−1, respectively) depended on physico-chemical and biological (bacteria and viruses) variability and the calcareous nature of the catchment basin. Calcium-bound phosphate prevailed in the reservoir. Drastic control of phosphate input is suggested to avoid accumulation of calcium-bound phosphate which may dissociate and thereby contribute to eutrophication.
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Dates et versions

hal-01105114 , version 1 (19-01-2015)

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Mohamed Alaoui-Mhamdi, Amel Dhib, Abderrahim Bouhaddioui, Boutheina Ziadi, Souad Turki, et al.. Assessment of nitrogen and phosphate balance and the roles of bacteria and viruses at the water-sediment interface in the Allal El Fassi reservoir (Morocco). Environmental Monitoring and Assessment, 2014, 186 (9), pp.5817-5829. ⟨10.1007/s10661-014-3821-7⟩. ⟨hal-01105114⟩
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