Articles | Volume 12, issue 1
https://doi.org/10.5194/soil-12-521-2026
© Author(s) 2026. 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-12-521-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Original research article
| 
01 May 2026
Original research article |
| 01 May 2026
| 01 May 2026
Formation of mineral-associated organic matter via rock weathering: an experimental test for the organo-metallic glue hypothesis
Kaori Matsuoka
CORRESPONDING AUTHOR
Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization, Tsukuba, 305-8604, Japan
Jo Jinno
Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization, Tsukuba, 305-8604, Japan
Hiroaki Shimada
Research Center for Global Agromedicine, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, 080-8555, Japan
Emi Matsumura
Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization, Tsukuba, 305-8604, Japan
Ryo Shingubara
Research Center for Advanced Analysis, National Agriculture and Food Research Organization, Tsukuba, 305-8604, Japan
Puu-Tai Yang
Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization, Tsukuba, 305-8604, Japan
Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization, Tsukuba, 305-8604, Japan
present address: Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, 113-8657, Japan
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Shigeyuki Ishidoya, Takahisa Maeda, Hidehiko Kikuno, Jumpei Fukumasu, Shinya Iwasaki, Sadao Eguchi, Rota Wagai, Kei Asada, Taku Nishimura, Takuhei Yamasaki, Shinji Suzuki, Shohei Murayama, Atsushi Yamamoto, Asaka Hasegawa, Satoshi Sugawara, Shuji Aoki, and Takakiyo Nakazawa
EGUsphere, https://doi.org/10.5194/egusphere-2026-2751, https://doi.org/10.5194/egusphere-2026-2751, 2026
This preprint is open for discussion and under review for Biogeosciences (BG).
Short summary
Short summary
Soil chamber measurements of O2 and its δ(18O) and CO2 were conducted at a forest site and at agricultural fields. The O2:CO2 exchange ratios for soil–air fluxes were stable at the forest site but variable at agricultural fields. We partitioned measured CO2 fluxes into soil respiration and abiotic reactions to evaluate carbon dioxide removal rate for enhanced rock weathering. The isotopic effect of O2 for soil respiration was evaluated and we estimated its impact on the Dole–Morita effect.
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Short summary
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.
The organo-mineral assemblage formation from the mixture of crushed rocks and leaf compost was...
