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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
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
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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