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