Phosphorus Fractionation Responds to Dynamic Redox Conditions in a Humid Tropical Forest Soil

Lin, Yang; Bhattacharyya, Amrita; Campbell, Ashley N.; Nico, Peter S.; Pett-Ridge, Jennifer; Silver, Whendee L.

doi:10.1029/2018JG004420

Title: Phosphorus Fractionation Responds to Dynamic Redox Conditions in a Humid Tropical Forest Soil

Journal Article · Wed Aug 22 00:00:00 EDT 2018 · Journal of Geophysical Research. Biogeosciences

DOI:https://doi.org/10.1029/2018JG004420· OSTI ID:1512601

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

Abstract Phosphorus (P) is a key limiting nutrient in highly weathered soils of humid tropical forests. A large proportion of P in these soils is bound to redox‐sensitive iron (Fe) minerals; however, little is known about how Fe redox interactions affect soil P cycling. In an incubation experiment, we changed bulk soil redox regimes by varying headspace conditions (air versus N ₂ gas) and examined the responses of soil P and Fe species to two fluctuating treatments (4‐ or 8‐day oxic followed by 4‐day anoxic) and two static redox treatments (oxic and anoxic). A static anoxic headspace increased NaOH‐extractable inorganic P and ammonium oxalate‐extractable total P (AO‐P _t ) by 10% and 38%, respectively, relative to a static oxic headspace. Persistent anoxia also increased NaHCO ₃ ‐extractable total P (NaHCO ₃ ‐P _t ) toward the end of the experiment. Effects of redox fluctuation were more complex and dependent on temporal scales. Ammonium oxalate‐extractable Fe and P _t concentrations responded to redox fluctuation early in the experiment, but not thereafter, suggesting a depletion of reductant over time. Immediately following a switch from an oxic to anoxic headspace, concentrations of AO‐P _t , AO‐Fe, and HCl‐extractable Fe(II) increased (within 30 min) but fell back to initial levels by 180 min. Surprisingly, the labile P pool (NaHCO ₃ ‐P _t ) decreased immediately after reduction events, potentially due to resorption and microbial uptake. Overall, our data demonstrate that P fractions can respond rapidly to changes in soil redox conditions, and in environments where redox oscillation is common, roots and microbes may benefit from these rapid P dynamics.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; DE‐AC52‐07NA27344; SCW1478

OSTI ID:: 1512601

Alternate ID(s):: OSTI ID: 1472184

Report Number(s):: LLNL-JRNL-738828; 892107

Journal Information:: Journal of Geophysical Research. Biogeosciences, Vol. 123, Issue 9; ISSN 2169-8953

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 23 works

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