Title
Sedimentary evidence of soil organic matter input to the curuai amazonian floodplain
Date Issued
01 October 2013
Access level
open access
Resource Type
journal article
Author(s)
Zocatelli R.
Moreira-Turcq P.
Bernardes M.
Cordeiro R.C.
Gogo S.
Disnar J.R.
Boussafir M.
Universidad Federal Fluminense
Abstract
A multi-proxy study has been performed on a sediment core from the Curuai floodplain, Central Amazonia. The combination of elemental, isotopic and molecular analysis of a 110. cm core (a record of ca. the last 100. yr) allowed reconstruction of the hydrological conditions of organic matter (OM) deposition. Two units could be delineated. The first (UI) was composed of three sub-units: UIa (0-15. cm), composed of highly degraded organic particles originating from the surrounding soil and indicative of restricted transport; UIb (15-48. cm), during which the region was permanently flooded and the material stored came from soil runoff, mainly from alluvial forest; and UIc (48-88. cm) composed of material from Amazon River suspended sediment, itself originating from OM degradation in forest soil. In UII (88-111. cm), the OM originated mainly from the forest soil and other plant remains in the floodplain. The data reveal that, during the four distinct depositional periods, the sedimentary OM alternated between land derived soil and alluvial vegetation due to changes in hydrodynamics. © 2013 Elsevier Ltd.
Start page
40
End page
47
Volume
63
Language
English
OCDE Knowledge area
OceanografÃa, HidrologÃa, Recursos hÃdricos
Geociencias, Multidisciplinar
Scopus EID
2-s2.0-84883381543
Source
Organic Geochemistry
ISSN of the container
01466380
Sponsor(s)
The study was accomplished as part of a collaborative project between the IRD-France, CNPq-Brasil and ISTO/CNRS. Varzea de Curuai is being studied within the framework of the HYBAM network. The research was also supported by a CNRS/INSU/PALEO2 – PASCAL project (PASt climate change impacts on Carbon Accumulation in Amazonia floodplain Lakes). One of us (R.Z.) received financial support from the CNPq and CAPES. We acknowledge support from ANR 2010 BLANC 608 01 ELPASO. We thank M. Hatton and R. Boscardin for assistance during different phases of the study. We would also like to thank two anonymous reviewers for constructive comments.
Sources of information:
Directorio de Producción CientÃfica
Scopus