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Fast redox switches lead to rapid transformation of goethite in humid tropical soils: A Mössbauer spectroscopy study

Journal Article · · Soil Science Society of America Journal
DOI:https://doi.org/10.1002/saj2.20382· OSTI ID:1854634
 [1];  [2];  [2];  [3];  [4]
  1. Earth and Environmental Sciences Area Lawrence Berkeley National Lab. 1 Cyclotron Rd Berkeley CA 94720 USA, Physical and Life Sciences Directorate Lawrence Livermore National Lab. 7000 East Avenue Livermore CA 94550 USA
  2. Environmental Molecular Sciences Lab. Pacific Northwest National Lab. Richland WA 99354 USA
  3. Physical and Life Sciences Directorate Lawrence Livermore National Lab. 7000 East Avenue Livermore CA 94550 USA, Life and Environmental Sciences Dep. Univ. of California Merced CA USA
  4. Earth and Environmental Sciences Area Lawrence Berkeley National Lab. 1 Cyclotron Rd Berkeley CA 94720 USA
Abstract

Humid tropical forest soils experience frequent rainfall, which limits oxygen diffusion and creates redox heterogeneity in upland soils. In this study we gauged the effect of short‐term anoxic conditions on Fe mineralogy of relatively Fe‐ and C‐rich surface soils (C/Fe mole ratio ∼5) from a humid tropical forest in Puerto Rico. Soils subjected to 4‐d oxic/anoxic oscillation were characterized by selective chemical extractions, Mössbauer spectroscopy (MBS), and X‐ray diffraction. Chemical extraction data suggested that rapidly switching redox conditions had subtle effects on bulk Fe mineralogy. Mössbauer, on the other hand, indicated that (a) the soil Fe is a mixture of goethites of varying characteristics with minor contributions from ferrihydrite (<5%) and Fe(III)‐organic matter (OM) phases (∼10%), and (b) anoxic conditions rapidly transformed all forms of goethite to relatively stable Fe oxides. Such fast changes in goethite features could be due to rapid depletion and sorption of bio‐released structural Al or sorbed OM onto residual soil components. The rapid temporal changes in MBS parameters and corresponding pore water nominal oxidation state of C values suggest that Fe‐C transformations in these upland tropical soils are complex and intricately coupled. A comprehensive understanding of the fate of Fe, Al, and OM (Fe‐organic moieties) during redox switches and concurrent changes in pore water chemistry is critical for development of robust transport models in humid tropical soils, which are subject to episodic low‐redox events.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231; AC05-76RL01830; AC52-07NA27344
OSTI ID:
1854634
Alternate ID(s):
OSTI ID: 1854635
OSTI ID: 1861783
OSTI ID: 1959323
Report Number(s):
PNNL-SA-164689
Journal Information:
Soil Science Society of America Journal, Journal Name: Soil Science Society of America Journal Journal Issue: 2 Vol. 86; ISSN 0361-5995
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
United States
Language:
English

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