Title:
Rock magnetic, chemical and bacterial community analysis of a modern soil from Nebraska

Authors:
Guyodo, Y; LaPara, TM; Anschutz, AJ; Penn, RL; Banerjee, SK; Geiss, CE; Zanner, W

Author Full Names:
Guyodo, Yohan; LaPara, Timothy M.; Anschutz, Amy J.; Penn, R. Lee; Banerjee, Subir K.; Geiss, Christoph E.; Zanner, William

Source:
EARTH AND PLANETARY SCIENCE LETTERS 251 (1-2): 168-178 NOV 15 2006

Language:
English

Document Type:
Article

Author Keywords:
rock magnetism; mineral magnetism; iron reducing bacteria

Keywords Plus:
FE(III) REDUCTION; CHINESE LOESS; IRON; SUSCEPTIBILITY; GOETHITE; BEHAVIOR; ORIGIN; GENES; FIELD; SIZE

Abstract:
Detailed rock-magnetic and bacterial community analyses have been conducted on a 2.2 m-long soil profile developed over loess in Nebraska. Results show magnetic enhancement in the A-horizon of the soil profile, in part due to increased concentration of pedogenic superparamagnetic (SP) ferrimagnetic minerals (i.e., magnetite, maghemite). The magnetic enhancement correlates well with higher microbial biomass and lower iron hydroxide concentrations (here determined using a goethite-specific magnetic method), therefore supporting the idea of bacterially-mediated topsoil magnetite formation through iron-reduction of iron hydroxides. Cultivation-independent bacterial community analysis biased towards the Geobacteraceae (common dissimilatory iron-reducing bacteria) failed to show the involvement of this phylogenetic group in SP magnetite formation at this site. Although preliminary in nature, our failure to implicate dissimilatory Geobacteraceae with magnetic enhancement in modem N!
 ebraskan soil and Dearing et al. (Dearing, Hannam, Anderson, Wellington, Geophysical Journal International 144 (2001) 183-196) earlier failure to detect magnetotactic bacteria in enhanced British soils points to the need to focus further multidisciplinary investigations on the possible roles of other dissimilatory iron reducing bacteria in contributing to magnetic enhancement. Many authors have produced strong circumstantial evidence of a microbial role in causing magnetic enhancement in topsoils of temperate climate zones, yet a precise role of specific cultured microbes in enhancing soil magnetism is still lacking. (c) 2006 Elsevier B.V All rights reserved.

Reprint Address:
Guyodo, Y, UVSQ, CNRS, Lab CEA, IPSL,LSCE, Campus CNRS,12 Ave Terrasse, F-91198 Gif Sur Yvette, France.

Research Institution addresses:
UVSQ, CNRS, Lab CEA, IPSL,LSCE, F-91198 Gif Sur Yvette, France; Univ Minnesota, Dept Civil Engn, Minneapolis, MN 55455 USA; Univ Minnesota, Dept Chem, Minneapolis, MN 55455 USA; Univ Minnesota, Dept Geol & Geophys, Inst Rock Magnetism, Minneapolis, MN 55455 USA; Trinity Coll, Dept Phys, Hartford, CT 06106 USA; Univ Minnesota, Dept Soil Water & Climate, St Paul, MN 55108 USA

E-mail Address:
guyodo@lsce.cnrs-gif.fr

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Cited Reference Count:
38

Times Cited:
0

Publisher:
ELSEVIER SCIENCE BV; PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS

Subject Category:
Geochemistry & Geophysics

ISSN:
0012-821X

IDS Number:
109HJ