Skip to Main content Skip to Navigation
Journal articles

Rôle des facteurs édaphiques et hydrométéorologiques dans la survie et le transfert de bactéries fécales bovines, à l'échelle bassin versant: cas de pâturages d'altitude

Abstract : This research project entitled « Pastor » is devoted to the study of the survival and dissemination of fecal bacteria contaminants originated from cattle, in soil and surface water. It focuses on microbial contamination by Escherichia coli in relationship with dairy grazing of alpine rangelands. E. coli is considered as a global indicator of fecal contaminations. Studies have been carried both at the plot and at the watershed scale. They deal with : 1) the dynamics of E. coli populations, including pathogenic STEC (Shiga-toxin producing E. coli) strains, released in the mountain environment ; the objective is to characterize survival and storage ompartments of E. coli in soil following their release by cattle feces ; the population dynamics of E. coli in soils is compared with dynamics of typical soil inhabitants (the fluorescent Pseudomonas spp.), in order to reveal specific adaptive strategies of E. coli ;2) the identification and characterization of the grazing areas providing specifically a high contribution to fecal contamination of surface water ; this was carried out by quantifying and modeling E. coli transfers from soil to water, with the aim to link together E. coli fluxes monitored at the watershed outlet, grazing conditions and hydrologic properties of the watershed. The output of the model is of interest to identify the critical source areas. Further assessment of the groundwater compartment is needed to improve our understanding of E. coli ecology especially with regards to the outlet peaks unrelated to stromflows. The operational interest of « Pastor » concerns the prevention of fecal pollution of surface water and the relevance of E. coli as an indicator of fecal contamination. The knowledge of critical source areas is an important information for management of pastured watersheds.
Document type :
Journal articles
Complete list of metadatas

https://hal-univ-lyon1.archives-ouvertes.fr/hal-02540450
Contributor : Depot 1 Lyon 1 <>
Submitted on : Saturday, April 11, 2020 - 9:09:19 AM
Last modification on : Tuesday, July 28, 2020 - 11:56:06 AM

Identifiers

  • HAL Id : hal-02540450, version 1

Collections

Citation

J. M. Dorioz, P. Quetin, C. Prigent-Combaret, D. Trévisan. Rôle des facteurs édaphiques et hydrométéorologiques dans la survie et le transfert de bactéries fécales bovines, à l'échelle bassin versant: cas de pâturages d'altitude. Etude et Gestion des Sols, Association Française pour l'Etude des Sols, 2011, 18 (3), pp.217-236. ⟨hal-02540450⟩

Share

Metrics

Record views

19