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(Article of periodic en Anglais - 2014)

Document title

Carbon sinks in small Sahelian lakes as an unexpected effect of land use changes since the 1960s (Saga Gorou and Dallol Bosso, SW Niger)

Authors(s) and Affiliation(s)

MABICKA OBAME R. (1 2) ; COPARD Y. (1 3) ; SEBAG D. (1 4) ; ABDOURHAMANE TOURÉ A. (5) ; BOUSSAFIR M. (3) ; BICHET V. (6) ; GARZA Z. (5) ; GUILLON R. (7) ; PETIT C. (8) ; RAJOT J.-L. (9 10) ; DURAND A. (1) ;
(1) Lab. M2C, UMR CNRS 6143, Univ. Rouen, Mont Saint Aignan, FRANCE
(2) Lab. URESTE, Univ. Masuku, Franceville, GABON
(3) Lab. ISTO, UMR CNRS 7327, Univ., Orléans, FRANCE
(4) Lab. HydroSciences Montpellier, UMR IRD 5569, Univ., Ngaoundéré, CAMEROUN
(5) Dept. of Earth Sciences, Univ. Abdou Moumouni, Niamey, NIGER
(6) Lab. Chrono-Environnement, UMR CNRS 6249, Univ. Franche-Comté, Besançon, FRANCE
(7) Lab. ArTeHis, UMR CNRS 6298, Univ. Bourgogne, Dijon, FRANCE
(8) Lab. ArScAn, UMR CNRS 7041, Univ. Paris 1, Paris, FRANCE
(9) Lab. Bioemco, UMR IRD 211, Niamey, NIGER
(10) Lab. LISA, UMR CNRS 7583, Univ. Paris-Est Créteil, Créteil, FRANCE

Abstract

The origins of particulate organic matter (OM) preserved within lacustrine sediments of 3 lakes were investigated by coupling optical observations (palynofacies) and bulk geochemistry (Rock-Eval 6 pyrolysis). Soil organic matter (SOM) was sampled from the surface of various land-use and land-cover areas and was characterized and compared with sedimentary organic matter. The results reveal that Lake Tankalawal is subjected to high autochthonous organic sedimentation, while lakes Bangou Kirey and Bi are characterized by weak sedimentation of non-indigenous OM originating from the soil erosion and shore vegetation. In sediments, the effects of early diagenesis on the OM induce not only a loss of labile and aquatic OM but also a significant loss of terrestrial OM. Both the preservation of OM in top sediments and the relative preservation of terrestrial OM impact the OC storage in lakes. Accordingly, in these Sahelian environments that are generally viewed as non-efficient in storing OC, the AA. claim that global change could promote a new OC sink.

Source

Article of periodic

published at : Catena / ISSN 0341-8162

Editor : Catena, Cremlingen-Destedt - ALLEMAGNE (1973)

Millesime : 2014, vol. 114 [pp. 1-10]

Bibliographic references : 1 p.

Collation : 5 fig., 2 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 16767

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1016/j.catena.2013.10.008

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
Refdoc record number (ud4) : 28337762 : Permanent link - XML version
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