SOIL
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SOIL
Articles | Volume 6, issue 2
Articles | Volume 6, issue 2
https://doi.org/10.5194/soil-6-597-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/soil-6-597-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 6, issue 2
Original research article
 | Highlight paper
 | 
07 Dec 2020
Original research article | Highlight paper |  | 07 Dec 2020

Iron and aluminum association with microbially processed organic matter via meso-density aggregate formation across soils: organo-metallic glue hypothesis

Rota Wagai, Masako Kajiura, and Maki Asano

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Short summary
Global significance of metals (extractable Fe and Al phases) to control organic matter (OM) in recognized. Next key questions include the identification of their localization and mechanism behind OM–metal relationships. Across 23 soils of contrasting mineralogy, Fe and Al phases were mainly associated with microbially processed OM as meso-density microaggregates. OM- and metal-rich nanocomposites with a narrow OM :  metal ratio likely acted as binding agents. A new conceptual model was proposed.
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