HAL: ird-00363984, version 1

DOI: 10.1016/j.scitotenv.2007.08.003

IRD Horizon id: fdi:010040905

Detailed view

Export this paper BibTeX - EndNote - TEI - RefWorks -

Science of The Total Environment 388, 1-3 (2007) 184-193

Dissolved organic matter fluorescence as a water-flow tracer in the tropical wetland of Pantanal of Nhecolandia, Brazil

M. Mariot 1, Y. Dudal 2, S. Furian 3, A. Sakamoto 4, V. Valles 1, M. Fort 5, Laurent Barbiero (  Corresponding author ) 6

(2007)

The Nhecolandia is a sub-region of the Brazilian Pantanal wetland, where saline and freshwater lakes coexist in close proximity. Measurements of dissolved organic carbon (DOC) content and analysis of fluorescence excitation-emission matrices (EEM) were conducted in an effort to characterize spatial variability in concentration and source of dissolved organic matter (DOM) and to further understand the hydrochemical functioning of this complex environment. Increasing pH under the influence of evaporation resulted in an increasing DOC solubility ranging from 50 to over 300 mgC L-1 in surface water. Spectrofluorescence characterisation indicates the presence of several families of dissolved organic matter (fulvic and humic-type and proteinaceous materials), which are related to the type of lake and its hydro-bio-geochemical functioning. Moreover, the fluorescence signatures from lake water DOM and from surrounding soil-water-extracted organic matter (WEOM) show strong similarities although some labile proteinaceous compounds disappeared during humification. Results from the characterisation of DOM and WEOM not only suggest that spectrofluorescence is a reliable technique for the tracing of water flows, but also for the marking of the origin of organic horizons in this environment.

1:	Laboratoire d'Hydrogéologie d'Avignon (LHA)
	Université d'Avignon : EA2665
2:	Unité mixte de recherche Climat Sol et Environnement (UMR CSE 1114)
	Institut national de la recherche agronomique (INRA) – Université d'Avignon
3:	Laboratorio de pedologia (Laboped)
	Universidade de São Paulo
4:	Laboratório de Pedologia, Departamento de Geografia
	Universidade Federal do Mato Grosso do Sul
5:	Pole de recherche pour l'organisation et la diffusion de l'information géographique (PRODIG)
	CNRS : UMR8586 – Université Paris I - Panthéon-Sorbonne – Université Paris IV - Paris Sorbonne – Université Paris VII - Paris Diderot – Ecole Pratique des Hautes Etudes – Institut de recherche pour le développement [IRD] : UR215
6:	Laboratoire des Mécanismes et Transfert en Géologie (LMTG)
	CNRS : UMR5563 – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III – Institut de recherche pour le développement [IRD] : UMR154

subject

:

Life Sciences/Agricultural sciences/Soil study

keyword(s): spectrofluorecence – organic matter – tracing – alkaline wetland – pantanal – Brazil

ird-00363984, version 1

http://hal.ird.fr/ird-00363984

oai:hal.ird.fr:ird-00363984

From: Laurent Barbiero <>

Submitted on: Wednesday, 25 February 2009 07:31:44

Updated on: Wednesday, 25 February 2009 09:23:08