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

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-Pt) 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 Pt 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-Pt, AO-Fe, and HCl-extractable Fe(II) increased (within 30 min) but fell back to initial levels by 180 min.more » 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.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4]; ORCiD logo [3]; ORCiD logo [1]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Environmental Science, Policy, and Management
  2. 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
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physical and Life Sciences Directorate
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth and Environmental Sciences Area
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1512601
Alternate Identifier(s):
OSTI ID: 1472184
Report Number(s):
[LLNL-JRNL-738828]
[Journal ID: ISSN 2169-8953; 892107]
Grant/Contract Number:  
[AC52-07NA27344; SCW1478; CA-B-ECO-7673-MS; DEB-0620910; EAR-1331841]
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Biogeosciences
Additional Journal Information:
[ Journal Volume: 123; Journal Issue: 9]; Journal ID: ISSN 2169-8953
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Lin, Yang, Bhattacharyya, Amrita, Campbell, Ashley N., Nico, Peter S., Pett-Ridge, Jennifer, and Silver, Whendee L. Phosphorus Fractionation Responds to Dynamic Redox Conditions in a Humid Tropical Forest Soil. United States: N. p., 2018. Web. doi:10.1029/2018JG004420.
Lin, Yang, Bhattacharyya, Amrita, Campbell, Ashley N., Nico, Peter S., Pett-Ridge, Jennifer, & Silver, Whendee L. Phosphorus Fractionation Responds to Dynamic Redox Conditions in a Humid Tropical Forest Soil. United States. doi:10.1029/2018JG004420.
Lin, Yang, Bhattacharyya, Amrita, Campbell, Ashley N., Nico, Peter S., Pett-Ridge, Jennifer, and Silver, Whendee L. Wed . "Phosphorus Fractionation Responds to Dynamic Redox Conditions in a Humid Tropical Forest Soil". United States. doi:10.1029/2018JG004420. https://www.osti.gov/servlets/purl/1512601.
@article{osti_1512601,
title = {Phosphorus Fractionation Responds to Dynamic Redox Conditions in a Humid Tropical Forest Soil},
author = {Lin, Yang and Bhattacharyya, Amrita and Campbell, Ashley N. and Nico, Peter S. and Pett-Ridge, Jennifer and Silver, Whendee L.},
abstractNote = {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 N2 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-Pt) by 10% and 38%, respectively, relative to a static oxic headspace. Persistent anoxia also increased NaHCO3-extractable total P (NaHCO3-Pt) toward the end of the experiment. Effects of redox fluctuation were more complex and dependent on temporal scales. Ammonium oxalate-extractable Fe and Pt 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-Pt, 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 (NaHCO3-Pt) 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.},
doi = {10.1029/2018JG004420},
journal = {Journal of Geophysical Research. Biogeosciences},
number = [9],
volume = [123],
place = {United States},
year = {2018},
month = {8}
}

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