Redox Fluctuations Control the Coupled Cycling of Iron and Carbon in Tropical Forest Soils

Bhattacharyya, Amrita; Campbell, Ashley N.; Tfaily, Malak M.; Lin, Yang; Kukkadapu, Ravi K.; Silver, Whendee L.; Nico, Peter S.; Pett-Ridge, Jennifer

doi:10.1021/acs.est.8b03408

Redox Fluctuations Control the Coupled Cycling of Iron and Carbon in Tropical Forest Soils

Journal Article · Mon Nov 19 00:00:00 EST 2018 · Environmental Science and Technology

DOI:https://doi.org/10.1021/acs.est.8b03408· OSTI ID:1561901

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Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth and Environmental Sciences Area; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physical and Life Sciences Directorate
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physical and Life Sciences Directorate
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab.
Univ. of California, Berkeley, CA (United States). Dept. of Environmental Science, Policy, and Management
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab.
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth and Environmental Sciences Area

In this paper, oscillating redox conditions are a common feature of humid tropical forest soils, driven by an ample supply and dynamics of reductants, high moisture, microbial oxygen consumption, and finely textured clays that limit diffusion. However, the net result of variable soil redox regimes on iron (Fe) mineral dynamics and associated carbon (C) forms and fluxes is poorly understood in tropical soils. Using a 44-day redox incubation experiment with humid tropical forest soils from Puerto Rico, we examined patterns in Fe and C transformations under four redox regimes: static anoxic, "flux 4-day" (4d oxic, 4d anoxic), "flux 8-day" (8d oxic, 4d anoxic) and static oxic. Prolonged anoxia promoted reductive dissolution of Fe-oxides, and led to an increase in soluble Fe(II) and amorphous Fe oxide pools. Preferential dissolution of the less-crystalline Fe pool was evident immediately following a shift in bulk redox status (oxic to anoxic), and coincided with increased dissolved organic C, presumably due to acidification or direct release of organic matter (OM) from dissolving Fe(III) mineral phases. The average nominal oxidation state of water-soluble C was lowest under persistent anoxic conditions, suggesting that more reduced organic compounds were metabolically unavailable for microbial consumption under reducing conditions. Anoxic soil compounds had high H/C values (and were similar to lignin-like compounds) whereas oxic soil compounds had higher O/C values, akin to tannin- and cellulose-like components. Cumulative respiration derived from native soil organic C was highest in static oxic soils. These results show how Fe minerals and Fe-OM interactions in tropical soils are highly sensitive to variable redox effects. Shifting soil oxygen availability rapidly impacted exchanges between mineral-sorbed and aqueous C pools, increased the dissolved organic C pool under anoxic conditions implying that the periodicity of low-redox events may control the fate of C in wet tropical soils.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515; AC52-07NA27344

OSTI ID:: 1561901

Alternate ID(s):: OSTI ID: 1647140
OSTI ID: 1497008

Report Number(s):: LLNL-JRNL-750645; ark:/13030/qt9ht6z28p

Journal Information:: Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 24 Vol. 52; ISSN 0013-936X

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Redox Fluctuations Control the Coupled Cycling of Iron and Carbon in Tropical Forest Soils

Journal Article · Sun Nov 18 23:00:00 EST 2018 · Environmental Science and Technology · OSTI ID:1497008

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redox reactions
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Redox Fluctuations Control the Coupled Cycling of Iron and Carbon in Tropical Forest Soils

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