Iron and iron-bound phosphate accumulate in surface soils of ice-wedge polygons in arctic tundra
Abstract
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 (Pi) were most enriched atmore »
- Authors:
-
[1];
[2];
[3];
[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
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1649274
- Alternate Identifier(s):
- OSTI ID: 1631372
- Grant/Contract Number:
- AC05-00OR22725; AC02-06CH11357; EAR-1609027; ERPK757
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Environmental Science: Processes & Impacts
- Additional Journal Information:
- Journal Volume: 22; Journal Issue: 7; Journal ID: ISSN 2050-7887
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES
Citation Formats
Herndon, Elizabeth, Kinsman-Costello, Lauren, Di Domenico, Nicolle, Duroe, Kiersten, Barczok, Maximilian, Smith, Chelsea, and Wullschleger, Stan D. Iron and iron-bound phosphate accumulate in surface soils of ice-wedge polygons in arctic tundra. United States: N. p., 2020.
Web. doi:10.1039/d0em00142b.
Herndon, Elizabeth, Kinsman-Costello, Lauren, Di Domenico, Nicolle, Duroe, Kiersten, Barczok, Maximilian, Smith, Chelsea, & Wullschleger, Stan D. Iron and iron-bound phosphate accumulate in surface soils of ice-wedge polygons in arctic tundra. United States. https://doi.org/10.1039/d0em00142b
Herndon, Elizabeth, Kinsman-Costello, Lauren, Di Domenico, Nicolle, Duroe, Kiersten, Barczok, Maximilian, Smith, Chelsea, and Wullschleger, Stan D. Thu .
"Iron and iron-bound phosphate accumulate in surface soils of ice-wedge polygons in arctic tundra". United States. https://doi.org/10.1039/d0em00142b. https://www.osti.gov/servlets/purl/1649274.
@article{osti_1649274,
title = {Iron and iron-bound phosphate accumulate in surface soils of ice-wedge polygons in arctic tundra},
author = {Herndon, Elizabeth and Kinsman-Costello, Lauren and Di Domenico, Nicolle and Duroe, Kiersten and Barczok, Maximilian and Smith, Chelsea and Wullschleger, Stan D.},
abstractNote = {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 (Pi) were most enriched at the soil surface and decreased gradually with depth, and Fe-bound Pi was >4× greater than water-soluble Pi. These results demonstrate that Fe-bound Pi is a large and ecologically important reservoir of phosphate. We contend that Fe oxyhydroxides and other minerals may regulate Pi solubility under fluctuating redox conditions in organic surface soils on the arctic tundra.},
doi = {10.1039/d0em00142b},
journal = {Environmental Science: Processes & Impacts},
number = 7,
volume = 22,
place = {United States},
year = {Thu May 21 00:00:00 EDT 2020},
month = {Thu May 21 00:00:00 EDT 2020}
}
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