Spatial and seasonal contrasts of sedimentary organic matter in floodplain lakes of the central Amazon basin
In this study, we investigated the seasonal and spatial pattern of sedimentary organic matter (SOM) in five floodplain lakes of the central Amazon basin (Cabaliana, Janauaca, Canaçari, Mirituba and Curuai) which have different morphologies, hydrodynamics and vegetation coverages. Surface sediments w...
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doaj-2c45c8107c8745be8d8c5058999b54ea2020-11-24T22:56:48ZengCopernicus PublicationsBiogeosciences1726-41701726-41892016-01-0113246748210.5194/bg-13-467-2016Spatial and seasonal contrasts of sedimentary organic matter in floodplain lakes of the central Amazon basinR. L. Sobrinho0M. C. Bernardes1G. Abril2J.-H. Kim3C. I. Zell4J.-M. Mortillaro5T. Meziane6P. Moreira-Turcq7J. S. Sinninghe Damsté8Universidade Federal Fluminense, Department of Geochemistry, 24020-141, Niteroi, Rio de Janeiro, BrazilUniversidade Federal Fluminense, Department of Geochemistry, 24020-141, Niteroi, Rio de Janeiro, BrazilUniversidade Federal Fluminense, Department of Geochemistry, 24020-141, Niteroi, Rio de Janeiro, BrazilNIOZ Royal Netherlands Institute for Sea Research, Department of Marine Organic Biogeochemistry, P.O. Box 59, 1790 AB Den Burg, Texel, the NetherlandsNIOZ Royal Netherlands Institute for Sea Research, Department of Marine Organic Biogeochemistry, P.O. Box 59, 1790 AB Den Burg, Texel, the NetherlandsUMR-CNRS-IRD-UPMC 7208, BOREA, Département Milieux et Peuplements Aquatiques, MNHN, CP 53, 61 rue Buffon, 75231 Paris CEDEX 05, FranceUMR-CNRS-IRD-UPMC 7208, BOREA, Département Milieux et Peuplements Aquatiques, MNHN, CP 53, 61 rue Buffon, 75231 Paris CEDEX 05, FranceIRD (Institut de Recherche pour le Développement) GET (Géosciences Environnement Toulouse), Casilla 18-1209, Lima 18, PeruNIOZ Royal Netherlands Institute for Sea Research, Department of Marine Organic Biogeochemistry, P.O. Box 59, 1790 AB Den Burg, Texel, the NetherlandsIn this study, we investigated the seasonal and spatial pattern of sedimentary organic matter (SOM) in five floodplain lakes of the central Amazon basin (Cabaliana, Janauaca, Canaçari, Mirituba and Curuai) which have different morphologies, hydrodynamics and vegetation coverages. Surface sediments were collected in four hydrological seasons: low water (LW), rising water (RW), high water (HW) and falling water (FW) in 2009 and 2010. We investigated commonly used bulk geochemical tracers such as the C : N ratio and the stable isotopic composition of organic carbon (<i>δ</i><sup>13</sup>C<sub>org</sub>). These results were compared with lignin phenol parameters as an indicator of vascular plant detritus and branched glycerol dialkyl glycerol tetraethers (brGDGTs) to trace the input of soil organic matter (OM) from land to the aquatic settings. We also applied the crenarchaeol as an indicator of aquatic (rivers and lakes) OM. Our data showed that during the RW and FW seasons, the surface sediments were enriched in lignin and brGDGTs in comparison to other seasons. Our study also indicated that floodplain lake sediments primarily consisted of allochthonous, C<sub>3</sub> plant-derived OM. However, a downstream increase in C<sub>4</sub> macrophyte-derived OM contribution was observed along the gradient of increasing open waters – i.e., from upstream to downstream. Accordingly, we attribute the temporal and spatial difference in SOM composition to the hydrological dynamics between the floodplain lakes and the surrounding flooded forests.http://www.biogeosciences.net/13/467/2016/bg-13-467-2016.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
R. L. Sobrinho M. C. Bernardes G. Abril J.-H. Kim C. I. Zell J.-M. Mortillaro T. Meziane P. Moreira-Turcq J. S. Sinninghe Damsté |
spellingShingle |
R. L. Sobrinho M. C. Bernardes G. Abril J.-H. Kim C. I. Zell J.-M. Mortillaro T. Meziane P. Moreira-Turcq J. S. Sinninghe Damsté Spatial and seasonal contrasts of sedimentary organic matter in floodplain lakes of the central Amazon basin Biogeosciences |
author_facet |
R. L. Sobrinho M. C. Bernardes G. Abril J.-H. Kim C. I. Zell J.-M. Mortillaro T. Meziane P. Moreira-Turcq J. S. Sinninghe Damsté |
author_sort |
R. L. Sobrinho |
title |
Spatial and seasonal contrasts of sedimentary organic matter in floodplain lakes of the central Amazon basin |
title_short |
Spatial and seasonal contrasts of sedimentary organic matter in floodplain lakes of the central Amazon basin |
title_full |
Spatial and seasonal contrasts of sedimentary organic matter in floodplain lakes of the central Amazon basin |
title_fullStr |
Spatial and seasonal contrasts of sedimentary organic matter in floodplain lakes of the central Amazon basin |
title_full_unstemmed |
Spatial and seasonal contrasts of sedimentary organic matter in floodplain lakes of the central Amazon basin |
title_sort |
spatial and seasonal contrasts of sedimentary organic matter in floodplain lakes of the central amazon basin |
publisher |
Copernicus Publications |
series |
Biogeosciences |
issn |
1726-4170 1726-4189 |
publishDate |
2016-01-01 |
description |
In this study, we investigated the seasonal and spatial pattern of
sedimentary organic matter (SOM) in five floodplain lakes of the central
Amazon basin (Cabaliana, Janauaca, Canaçari, Mirituba and Curuai) which
have different morphologies, hydrodynamics and vegetation coverages. Surface
sediments were collected in four hydrological seasons: low water (LW),
rising water (RW), high water (HW) and falling water (FW) in 2009 and 2010.
We investigated commonly used bulk geochemical tracers such as the C : N ratio
and the stable isotopic composition of organic carbon (<i>δ</i><sup>13</sup>C<sub>org</sub>). These results were compared with lignin phenol
parameters as an indicator of vascular plant detritus and branched glycerol
dialkyl glycerol tetraethers (brGDGTs) to trace the input of soil organic
matter (OM) from land to the aquatic settings. We also applied the
crenarchaeol as an indicator of aquatic (rivers and lakes) OM. Our data
showed that during the RW and FW seasons, the surface sediments were
enriched in lignin and brGDGTs in comparison to other seasons. Our study
also indicated that floodplain lake sediments primarily consisted of
allochthonous, C<sub>3</sub> plant-derived OM. However, a downstream increase in
C<sub>4</sub> macrophyte-derived OM contribution was observed along the gradient
of increasing open waters – i.e., from upstream to downstream. Accordingly, we
attribute the temporal and spatial difference in SOM composition to the
hydrological dynamics between the floodplain lakes and the surrounding
flooded forests. |
url |
http://www.biogeosciences.net/13/467/2016/bg-13-467-2016.pdf |
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