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| Titel |
Stable (O, H) and strontium isotope tracing of the Narces de la Sauvetat peatland (Massif Central, France) water fluxes |
| VerfasserIn |
Agnès Brenot, Philippe Négrel, Romain Millot, Clotilde Bertin |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250048938
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| Zusammenfassung |
| Increasing efforts were engaged to restore degraded or lost wetlands and to manage wetlands
sustainably in order to assess their multiple benefits during the past decades. In this context,
important knowledge on the water cycle in the wetlands is required to manage specific
actions to restore and preserve these areas. In this study, we propose to use chemical and
multi-isotopic approaches combined with hydrological measurements (piezometric level and
stream flow measurements) to trace the fluxes of water and dissolved element involved in the
“Narces de la Sauvetat” peatland (France) and for the stream draining the area. Aims are to
evaluate the water status of this ecosystem as well as the origin of dissolved elements
and possible anthropogenic impacts. These approaches clearly demonstrated their
effectiveness to improve the knowledge on the hydrological functioning of wetlands
ecosystems.
Main results are (1) at least three fluxes with distinct chemical and isotopic
signatures are providing water supplies to peatland, (2) water flow that comes out of the
peatland through the stream is certainly negligible and 3) water within the peat land
exhibits isotopes values consistent with carbonate amendments inputs used in local
agriculture.
The outcomes of this study are that peatland ecosystem water balance is poorly affected
by its outlet but are strongly controlled by groundwater replenishment. This could lead
to a better adjustment of decision maker choices to maintain the water balance
of the peatland, which is essential for the preservation of this fragile ecosystem. |
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