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.

doi:10.1029/2018JG004776

Iron (Oxyhydr)Oxides Serve as Phosphate Traps in Tundra and Boreal Peat Soils

Journal Article · Tue Jan 15 00:00:00 EST 2019 · Journal of Geophysical Research. Biogeosciences

DOI:https://doi.org/10.1029/2018JG004776· OSTI ID:1530116

^[1]; Kinsman‐Costello, Lauren ^[1]; Duroe, Kiersten A. ^[1]; Mills, Jonathan ^[1]; Kane, Evan S. ^[2]; Sebestyen, Stephen D. ^[3]; ^[4]; ^[5]

Kent State Univ., Kent, OH (United States)
Michigan Technical Univ., Houghton, MI (United States)
USDA Forest Service, Grand Rapids, MN (United States)
Univ. of Georgia, Athens, GA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1530116

Alternate ID(s):: OSTI ID: 1499787

Journal Information:: Journal of Geophysical Research. Biogeosciences, Journal Name: Journal of Geophysical Research. Biogeosciences Journal Issue: 2 Vol. 124; ISSN 2169-8953

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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