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LCZO -- Phosphorus fractionation responds to dynamic redox conditions in a humid tropical forest soil -- El Verde Field Station -- (2016-2018)


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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 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.

The full paper is available here https://doi.org/10.1029/2018JG004420

Subject Keywords

Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Longitude
-65.8175°
Latitude
18.3211°

Content

ReadMe.md

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


OVERVIEW

Description/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 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.

Creator/Author

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

CZOs

Luquillo

Contact

MIguel Leon, Miguel.Leon@unh.edu




SUBJECTS

Disciplines

Biogeochemistry

Topics

Soil Biogeochemistry

Subtopic

Phosphorus fractionation response to dynamic redox

Keywords

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

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|

Variables ODM2

Depth, unsaturated zone|Iron|Phosphorus, total|Phosphorus, inorganic|Phosphorus, organic




TEMPORAL

Date Start

2016-01-01

Date End

2018-03-11




SPATIAL

Field Areas

El Verde Field Station

Location

El Verde Field Station

North latitude

18.3211

South latitude

18.3211

West longitude

-65.8175

East longitude

-65.8175




REFERENCE

Citation

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, http://www.hydroshare.org/resource/17d08a700064431180c55fc342bec839

CZO ID

6803



Additional Metadata

Name Value
czos Luquillo
czo_id 6803
citation 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, http://www.hydroshare.org/resource/17d08a700064431180c55fc342bec839
keywords Luquillo CZO and LTER, Puerto Rico, Ultisols, plant available phosphorous, Hedley fractionation, Olsen P, redox oscillation, iron reduction
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
disciplines Biogeochemistry

Related Resources

The content of this resource is derived from https://doi.org/10.1029/2018JG004420

Credits

Funding Agencies

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
NSF DEB Collaborative Research: The Role of Iron Redox Dynamics in Carbon Losses from Tropical Forest Soils 1457805
NSF EAR Luquillo CZO 1331841
NSF DEB Luquillo LTER 0620910

How to Cite

Lin, Y., A. Bhattacharyya, A. N. Campbell, P. S. Nico, J. Pett-Ridge, W. L. Silver (2020). LCZO -- Phosphorus fractionation responds to dynamic redox conditions in a humid tropical forest soil -- El Verde Field Station -- (2016-2018), HydroShare, http://www.hydroshare.org/resource/17d08a700064431180c55fc342bec839

This resource is shared under the Creative Commons Attribution CC BY.

http://creativecommons.org/licenses/by/4.0/
CC-BY

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