Skip to Main Content
Iron (Oxyhydr)Oxides Serve as Phosphate Traps in Tundra and Boreal Peat SoilsAuthor(s): Elizabeth M. Herndon; Lauren Kinsman-Costello; Kiersten A. Duroe; Jonathan Mills; Evan S. Kane; Stephen D. Sebestyen; Aaron A. Thompson; Stan D. Wullschleger
Source: Journal of Geophysical Research: Biogeosciences
Publication Series: Scientific Journal (JRNL)
Station: Northern Research Station
Download Publication (1.0 MB)
DescriptionArctic 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. 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.
- Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat.
- During the capture process some typographical errors may occur.
- Please contact Sharon Hobrla, email@example.com if you notice any errors which make this publication unusable.
CitationHerndon, Elizabeth M.; Kinsman-Costello, Lauren; Duroe, Kiersten A.; Mills, Jonathan; Kane, Evan S.; Sebestyen, Stephen D.; Thompson, Aaron A.; Wullschleger, Stan D. 2019. Iron (Oxyhydr)Oxides Serve as Phosphate Traps in Tundra and Boreal Peat Soils. Journal of Geophysical Research: Biogeosciences. 124(2): 227-246. https://doi.org/10.1029/2018JG004776.
- Iron addition to soil specifically stabilized lignin
- Geochemical processes and nutrient uptake by plants in hydric soils
- Does clear-cut harvesting accelerate initial wood decomposition? A five-year study with standard wood material
XML: View XML