Dataset Listing

El Verde Field Station - Soil Biogeochemistry - Phosphorus fractionation response to dynamic redox (2016-2018)

Variables:  redox treatments, labelled vs unlabelled ryegrass, anoxic vs oxic headspace, day of experiment, mintues after swtiching headspace, NaHCO3 extractable total Phosphorus, NaOH extractable inorganic Phosphorus, NaOH extractable organic Phosphorus, HCl extractable Iron (II), Iron in ammonium oxalate extract, Phosphorus in ammonium oxalate extract,

Standard Variables:  Depth, unsaturated zone|Iron|Phosphorus, total|Phosphorus, inorganic|Phosphorus, organic

Date Range:  (2016-2018)

Dataset Creators/Authors:  Lin, Yan; Bhattacharyya, Amrita; Campbell, Ashley N.; Nico, Peter S.; Pett-Ridge, Jennifer; Silver, Whendee L.

Contact:  MIguel Leon,

Field Area:   El Verde Field Station

Keywords & XML
  • Description

    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 vs. 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 (NaOH‐Pi) 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) towards 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 reductants 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.
  • Keywords

    Luquillo CZO and LTER, Puerto Rico, Ultisols, plant available phosphorous, Hedley fractionation, Olsen P, redox oscillation, iron reduction

    XML Metadata

    XML is in ISO-19115 geographic metadata format, compatible with ESRI Geoportal Server.

  • Citation for This Dataset

    Lin, Y., A. Bhattacharyya, A. N. Campbell, P. S. Nico, J. Pett-Ridge, W. L. Silver (2018). Phosphorus fractionation responds to dynamic redox conditions in a humid tropical forest soil, HydroShare,

    Citation for This Webpage

    Lin, Yan; Bhattacharyya, Amrita; Campbell, Ashley N.; Nico, Peter S.; Pett-Ridge, Jennifer; Silver, Whendee L. (2018). "CZO Dataset: El Verde Field Station - Soil Biogeochemistry (2016-2018) - Phosphorus fractionation response to dynamic redox." Retrieved 25 Feb 2020, from


El Verde Field Station - Phosphorus fractionation response to dynamic redox

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