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.
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.
the Creative Commons Attribution 4.0 License.
Original research article
| Highlight paper
| 
07 Dec 2020
Original research article | Highlight paper |
| 07 Dec 2020
| 07 Dec 2020
Iron and aluminum association with microbially processed organic matter via meso-density aggregate formation across soils: organo-metallic glue hypothesis
National Agriculture and Food Research Organization, Institute for
Agro-Environmental Sciences, 3-1-3 Kan-nondai, Tsukuba, Ibaraki, 305-8604,
Japan
Masako Kajiura
National Agriculture and Food Research Organization, Institute for
Agro-Environmental Sciences, 3-1-3 Kan-nondai, Tsukuba, Ibaraki, 305-8604,
Japan
Maki Asano
Faculty of Life and Environmental Sciences, University of Tsukuba,
1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan
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The organo-mineral assemblage formation from the mixture of crushed rocks and leaf compost was promoted by (i) microbial re-working of OM (indicated by lower C:N and higher δ13C and δ15N compared to the original leaf compost) and (ii) the supply of extractable metals (esp. oxalate-extractable Fe phase) from the rock weathering. These findings supported the organo-metallic glue hypothesis (Wagai et al., 2020) and suggest that C accretion during early pedogenesis.
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The feasibility of REOs as effective tracers for Andisols aggregate dynamics was estimated from (1) the impact of the labeling processes on soil organic matters, and (2) the ability of REOs to track Andisol aggregates turnover. In this study, REOs were also applied to quantify the relationship between aggregates and soil organic carbon dynamics. Overall, this approach provides considerable opportunity for further studies to explore the interaction between C and aggregate dynamics in Andisols.
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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.
Global significance of metals (extractable Fe and Al phases) to control organic matter (OM) in...
