Iron (Oxyhydr)Oxides Serve as Phosphate Traps in Tundra and Boreal Peat Soils
Arctic and boreal ecosystems are experiencing pronounced warming that is accelerating decomposition of soil organic matter and releasing greenhouse gases to the atmosphere. Future carbon storage in these ecosystems depends on the balance between microbial decomposition and primary production, both o...
Published in: | Journal of Geophysical Research: Biogeosciences |
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Online Access: | http://www.osti.gov/servlets/purl/1530116 https://www.osti.gov/biblio/1530116 https://doi.org/10.1029/2018JG004776 |
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ftosti:oai:osti.gov:1530116 2023-07-30T04:01:32+02:00 Iron (Oxyhydr)Oxides Serve as Phosphate Traps in Tundra and Boreal Peat Soils Herndon, Elizabeth M. Kinsman‐Costello, Lauren Duroe, Kiersten A. Mills, Jonathan Kane, Evan S. Sebestyen, Stephen D. Thompson, Aaron A. Wullschleger, Stan D. 2021-08-31 application/pdf http://www.osti.gov/servlets/purl/1530116 https://www.osti.gov/biblio/1530116 https://doi.org/10.1029/2018JG004776 unknown http://www.osti.gov/servlets/purl/1530116 https://www.osti.gov/biblio/1530116 https://doi.org/10.1029/2018JG004776 doi:10.1029/2018JG004776 59 BASIC BIOLOGICAL SCIENCES 2021 ftosti https://doi.org/10.1029/2018JG004776 2023-07-11T09:34:25Z Arctic and boreal ecosystems are experiencing pronounced warming that is accelerating decomposition of soil organic matter and releasing greenhouse gases to the atmosphere. Future carbon storage in these ecosystems depends on the balance between microbial decomposition and primary production, both of which can be regulated by nutrients such as phosphorus. Phosphorus cycling in tundra and boreal regions is often assumed to occur through biological pathways with little interaction with soil minerals; that is, phosphate released from organic molecules is rapidly assimilated by plants or microorganisms. In contrast to this prevailing conceptual model, we use sequential extractions and spectroscopic techniques to demonstrate that iron (oxyhydr)oxides sequester approximately half of soil phosphate in organic soils from four arctic and boreal sites. Iron (III) (oxyhydr)oxides accumulated in shallow soils of low–lying, saturated areas where circumneutral pH and the presence of a redox interface promoted iron oxidation and hydrolysis. Soils enriched in short–range ordered iron oxyhydroxides, which are susceptible to dissolution under anoxic conditions, had high phosphate sorption capacities and maintained low concentrations of soluble phosphate relative to soils containing mostly organic–bound iron or crystalline iron oxides. Thus, substantial quantities of phosphorus in these organic soils were associated with minerals that could reduce bioavailability but potentially also serve as phosphorus sources under anoxic conditions. Furthermore, the implication of this finding is that mineral surfaces effectively compete with biological processes for phosphate and must be considered as a nutrient regulator in these sensitive ecosystems. Other/Unknown Material Arctic Tundra SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic Journal of Geophysical Research: Biogeosciences 124 2 227 246 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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ftosti |
language |
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59 BASIC BIOLOGICAL SCIENCES |
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59 BASIC BIOLOGICAL SCIENCES Herndon, Elizabeth M. Kinsman‐Costello, Lauren Duroe, Kiersten A. Mills, Jonathan Kane, Evan S. Sebestyen, Stephen D. Thompson, Aaron A. Wullschleger, Stan D. Iron (Oxyhydr)Oxides Serve as Phosphate Traps in Tundra and Boreal Peat Soils |
topic_facet |
59 BASIC BIOLOGICAL SCIENCES |
description |
Arctic and boreal ecosystems are experiencing pronounced warming that is accelerating decomposition of soil organic matter and releasing greenhouse gases to the atmosphere. Future carbon storage in these ecosystems depends on the balance between microbial decomposition and primary production, both of which can be regulated by nutrients such as phosphorus. Phosphorus cycling in tundra and boreal regions is often assumed to occur through biological pathways with little interaction with soil minerals; that is, phosphate released from organic molecules is rapidly assimilated by plants or microorganisms. In contrast to this prevailing conceptual model, we use sequential extractions and spectroscopic techniques to demonstrate that iron (oxyhydr)oxides sequester approximately half of soil phosphate in organic soils from four arctic and boreal sites. Iron (III) (oxyhydr)oxides accumulated in shallow soils of low–lying, saturated areas where circumneutral pH and the presence of a redox interface promoted iron oxidation and hydrolysis. Soils enriched in short–range ordered iron oxyhydroxides, which are susceptible to dissolution under anoxic conditions, had high phosphate sorption capacities and maintained low concentrations of soluble phosphate relative to soils containing mostly organic–bound iron or crystalline iron oxides. Thus, substantial quantities of phosphorus in these organic soils were associated with minerals that could reduce bioavailability but potentially also serve as phosphorus sources under anoxic conditions. Furthermore, the implication of this finding is that mineral surfaces effectively compete with biological processes for phosphate and must be considered as a nutrient regulator in these sensitive ecosystems. |
author |
Herndon, Elizabeth M. Kinsman‐Costello, Lauren Duroe, Kiersten A. Mills, Jonathan Kane, Evan S. Sebestyen, Stephen D. Thompson, Aaron A. Wullschleger, Stan D. |
author_facet |
Herndon, Elizabeth M. Kinsman‐Costello, Lauren Duroe, Kiersten A. Mills, Jonathan Kane, Evan S. Sebestyen, Stephen D. Thompson, Aaron A. Wullschleger, Stan D. |
author_sort |
Herndon, Elizabeth M. |
title |
Iron (Oxyhydr)Oxides Serve as Phosphate Traps in Tundra and Boreal Peat Soils |
title_short |
Iron (Oxyhydr)Oxides Serve as Phosphate Traps in Tundra and Boreal Peat Soils |
title_full |
Iron (Oxyhydr)Oxides Serve as Phosphate Traps in Tundra and Boreal Peat Soils |
title_fullStr |
Iron (Oxyhydr)Oxides Serve as Phosphate Traps in Tundra and Boreal Peat Soils |
title_full_unstemmed |
Iron (Oxyhydr)Oxides Serve as Phosphate Traps in Tundra and Boreal Peat Soils |
title_sort |
iron (oxyhydr)oxides serve as phosphate traps in tundra and boreal peat soils |
publishDate |
2021 |
url |
http://www.osti.gov/servlets/purl/1530116 https://www.osti.gov/biblio/1530116 https://doi.org/10.1029/2018JG004776 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Tundra |
genre_facet |
Arctic Tundra |
op_relation |
http://www.osti.gov/servlets/purl/1530116 https://www.osti.gov/biblio/1530116 https://doi.org/10.1029/2018JG004776 doi:10.1029/2018JG004776 |
op_doi |
https://doi.org/10.1029/2018JG004776 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
124 |
container_issue |
2 |
container_start_page |
227 |
op_container_end_page |
246 |
_version_ |
1772812312136122368 |