Release of trace elements in wetlands: role of seasonal variability

Autor: Gérard Gruau, Anne Jaffrézic, Aline Dia, Odile Hénin, Gwenaelle Olivié-Lauquet, Christine Riou
Přispěvatelé: Sol Agro et hydrosystème Spatialisation (SAS), AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de la Recherche Agronomique (INRA)
Jazyk: angličtina
Rok vydání: 2001
Předmět:
Geologic Sediments
Environmental Engineering
010504 meteorology & atmospheric sciences
chemistry.chemical_element
Wetland
Fresh Water
Manganese
010501 environmental sciences
Ligands
01 natural sciences
Redox
CONDITION REDOX
[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology
Waste Management and Disposal
Ecosystem
ComputingMilieux_MISCELLANEOUS
0105 earth and related environmental sciences
Water Science and Technology
Civil and Structural Engineering
Hydrology
chemistry.chemical_classification
Total organic carbon
geography
geography.geographical_feature_category
Chemistry
Ecological Modeling
Aquatic ecosystem
HYDROLOGIE
Trace element
15. Life on land
Electron acceptor
Pollution
6. Clean water
Trace Elements
Zinc
13. Climate action
Environmental chemistry
France
Seasons
Cycling
Oxidation-Reduction
Copper
Zdroj: Water Research
Water Research, IWA Publishing, 2001, 35 (4), pp.943-952
ISSN: 0043-1354
Popis: Dissolved concentrations were determined for Fe, Mn, Al, Cu, Zn, La, U, Th, Cd and As in a wetland and its recipient stream to reveal the effect of seasonal changes in environmental conditions on the cycling and transfer of trace elements at the transition between terrestrial and aquatic ecosystems. These preliminary results from the wetland show marked seasonal changes in dissolved concentration for all elements except Zn and Cu. Concentrations are found to be low until about mid-February and then increase abruptly. The onset of trace element release appears to coincide with a marked decline in redox potential and increase of organic carbon content. Because this decline is itself correlated with a pronounced increase in temperature and dissolved Fe, Mn and organic carbon content, we suggest that the microorganisms which use soil iron and manganese oxy-hydroxides as electron acceptors catalyzed the change in redox conditions and induced an increase of DOC. Temporal changes were also observed in the recipient stream which showed marked positive concentration peaks during stormflow events (except Zn). The seasonal processes occurring in the wetland appear to play a major role in determining the amount of trace elements which are transferred from the wetland to the river.
Databáze: OpenAIRE
Externí odkaz: