(Article of periodic en Anglais - 2012)

Document title

Spatial distribution of chloride and nitrate within an unsaturated dune sand of a cold-arid desert : Implications for paleoenvironmental records

Authors(s) and Affiliation(s)

MA J. (1) ; WANG Y. (1) ; ZHAO Y. (1) ; JIN X. (1) ; NING N. (1) ; EDMUNDS W.M. (2) ; ZHOU X. (1) ;
(1) Key Lab. of Western China's Environmental Systems, Univ., Lanzhou, CHINE
(2) Oxford Centre for Water Research, Univ., Oxford, ROYAUME-UNI


Based on chloride mass balance approach, the AA. used two tracers (Cl− and NO3−) to study the interstitial water in four profiles of an unsaturated dune sand. The aim was to reconstruct the recharge history and use this to infer the long-term related climate changes and vegetation transitions in a cold-arid desert region of northwestern China, the western Badain Jaran desert. The orientation of a megadune's slopes appeared to greatly affect recharge variability. The near-surface peaks in NO3–N, with larger NO3–N/Cl− molar ratios, reflected active modern N-fixation by cyanobacteria, and the nitrate enrichment deeper in the unsaturated moisture zone indicated drier periods with less vegetation, limited nitrate fixation, or a combination of the two


Article of periodic

published at : Catena / ISSN 0341-8162

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

Millesime : 2012, vol. 96 [pp. 68-75]

Bibliographic references : 43 ref.

Collation : 5 fig., 3 tabl.



INIST-CNRS, Cote INIST : 16767

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1016/j.catena.2012.04.012

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2012
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