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

Auteur(s) et Affiliation(s)

Lab. M2C, UMR CNRS 6143, Univ. Rouen, Mont Saint Aignan, France
Lab. URESTE, Univ. Masuku, Franceville, Gabon
COPARD, Y.
Lab. M2C, UMR CNRS 6143, Univ. Rouen, Mont Saint Aignan, France
Lab. ISTO, UMR CNRS 7327, Univ., Orléans, France
SEBAG, D.
Lab. M2C, UMR CNRS 6143, Univ. Rouen, Mont Saint Aignan, France
Lab. HydroSciences Montpellier, UMR IRD 5569, Univ., Ngaoundéré, Cameroun
Dept. of Earth Sciences, Univ. Abdou Moumouni, Niamey, Niger
BOUSSAFIR, M.
Lab. ISTO, UMR CNRS 7327, Univ., Orléans, France
BICHET, V.
Lab. Chrono-Environnement, UMR CNRS 6249, Univ. Franche-Comté, Besançon, France
GARZA, Z.
Dept. of Earth Sciences, Univ. Abdou Moumouni, Niamey, Niger
GUILLON, R.
Lab. ArTeHis, UMR CNRS 6298, Univ. Bourgogne, Dijon, France
PETIT, C.
Lab. ArScAn, UMR CNRS 7041, Univ. Paris 1, Paris, France
RAJOT, J.-L.
Lab. Bioemco, UMR IRD 211, Niamey, Niger
Lab. LISA, UMR CNRS 7583, Univ. Paris-Est Créteil, Créteil, France
DURAND, A.
Lab. M2C, UMR CNRS 6143, Univ. Rouen, Mont Saint Aignan, France


Description :
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.


Type de document :
Article de périodique

Source :
Catena (Giessen), issn : 0341-8162, 2014, vol. 114, p. 1-10, nombre de pages : 10, Références bibliographiques : 1 p.

Date :
2014

Editeur :
Pays édition : Allemagne, Cremlingen-Destedt, Catena

Langue :
Anglais
Droits :
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