Iron and iron-bound phosphate accumulate in surface soils of ice-wedge polygons in arctic tundra

Herndon, Elizabeth; Kinsman-Costello, Lauren; Di Domenico, Nicolle; Duroe, Kiersten; Barczok, Maximilian; Smith, Chelsea; Wullschleger, Stan D.

doi:10.1039/d0em00142b

Iron and iron-bound phosphate accumulate in surface soils of ice-wedge polygons in arctic tundra

Journal Article · Thu May 21 00:00:00 EDT 2020 · Environmental Science: Processes & Impacts

DOI:https://doi.org/10.1039/d0em00142b· OSTI ID:1649274

^[1]; ^[2]; ^[3]; Duroe, Kiersten ^[3]; Barczok, Maximilian ^[3]; Smith, Chelsea ^[2]; ^[4]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Environmental Sciences Division; Kent State Univ., Kent, OH (United States). Dept. of Geology
Kent State Univ., Kent, OH (United States). Dept. of Biological Sciences
Kent State Univ., Kent, OH (United States). Dept. of Geology
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Environmental Sciences Division

Phosphorus (P) is a limiting or co-limiting nutrient to plants and microorganisms in diverse ecosystems that include the arctic tundra. Certain soil minerals can adsorb or co-precipitate with phosphate, and this mineral-bound P provides a potentially large P reservoir in soils. Iron (Fe) oxyhydroxides have a high capacity to adsorb phosphate; however, the ability of Fe oxyhydroxides to adsorb phosphate and limit P bioavailability in organic tundra soils is not known. In this study, we examined the depth distribution of soil Fe and P species in the active layer (<30 cm) of low-centered and high-centered ice-wedge polygons at the Barrow Environmental Observatory on the Alaska North Slope. Soil reservoirs of Fe and P in bulk horizons and in narrower depth increments were characterized using sequential chemical extractions and synchrotron-based X-ray absorption spectroscopy (XAS). Organic horizons across all polygon features (e.g., trough, ridge, and center) were enriched in extractable Fe and P relative to mineral horizons. Soil Fe was dominated by organic-bound Fe and short-range ordered Fe oxyhydroxides, while soil P was primarily associated with oxides and organic matter in organic horizons but apatite and/or calcareous minerals in mineral horizons. Iron oxyhydroxides and Fe-bound inorganic P (P_i) were most enriched at the soil surface and decreased gradually with depth, and Fe-bound P_i was >4× greater than water-soluble P_i. These results demonstrate that Fe-bound P_i is a large and ecologically important reservoir of phosphate. We contend that Fe oxyhydroxides and other minerals may regulate P_i solubility under fluctuating redox conditions in organic surface soils on the arctic tundra.

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

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC02-06CH11357; AC05-00OR22725

OSTI ID:: 1649274

Alternate ID(s):: OSTI ID: 1631372
OSTI ID: 1642242

Journal Information:: Environmental Science: Processes & Impacts, Journal Name: Environmental Science: Processes & Impacts Journal Issue: 7 Vol. 22; ISSN 2050-7887

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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