Exploring distributions of mineral-associated organic carbon age and chemical composition across diverse soil mineralogies
Comunicación oral presentada en AGU Fall Meeting 2022 12 -16 December 2022, Chicago (EEUU)
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| Format: | comunicación de congreso biblioteca |
| Language: | English |
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American Geophysical Union
2022-12
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| Online Access: | http://hdl.handle.net/10261/310681 |
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dig-irnas-es-10261-3106812023-06-05T12:44:39Z Exploring distributions of mineral-associated organic carbon age and chemical composition across diverse soil mineralogies Stoner, Shane Doetterl, Sebastian Trumbore, Susan Sierra, Carlos A. Schrumpf, Marion González-Pérez, José Antonio Hoyt, Alison Comunicación oral presentada en AGU Fall Meeting 2022 12 -16 December 2022, Chicago (EEUU) The dynamics of long-term C stability in soils has been widely attributed to associations with soil minerals, with different minerals displaying a variety of mechanisms and pathways for binding organic C. A growing body of evidence suggests that mineral-associated organic matter (MOM) cycles on a range of timescales from decades to millennia, suggesting a diverse C pool. While numerous methods for further fractionating MOM exist, a recent method utilizing increasing temperature as a proxy for activation energy to assess the stability of soil C has the ability to separate C based on thermal stability and establish a range of ages in MOM. We applied radiocarbon and the “thermal fractionation” technique to B-horizon soil mineral fractions with diverse mineralogical compositions, including short-range order (SRO) poorly-crystalline oxides, crystalline oxides, 1:1 and 2:1 clays, and mixed mineralogies. We found that the presence of 2:1 clay, specifically smectite, was associated with higher thermal stabilities and more diverse ages of MOM. We also applied py-GC/MS to characterize the chemistry of MOM released at each temperature, and found that while most soils were dominated by aromatic compounds, SRO minerals protected more “fresh” C, while SRO and 2:1 clays were associated with nitrogen-bearing compounds, suggesting strong long-term protection with these minerals. While subsoil C is assumed to be very stable, we identified portions of some MOM that may be quite reactive under changing conditions, such as increased [CO2], temperatures, and seasonal moisture. By describing the effects of soil minerals on the age structure of soil C, we can better identify reactive C pools and constrain soil models. No 2023-06-05T12:44:38Z 2023-06-05T12:44:38Z 2022-12 comunicación de congreso AGU Fall Meeting 2022 http://hdl.handle.net/10261/310681 en Sí none American Geophysical Union |
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English |
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Comunicación oral presentada en AGU Fall Meeting 2022 12 -16 December 2022, Chicago (EEUU) |
| format |
comunicación de congreso |
| author |
Stoner, Shane Doetterl, Sebastian Trumbore, Susan Sierra, Carlos A. Schrumpf, Marion González-Pérez, José Antonio Hoyt, Alison |
| spellingShingle |
Stoner, Shane Doetterl, Sebastian Trumbore, Susan Sierra, Carlos A. Schrumpf, Marion González-Pérez, José Antonio Hoyt, Alison Exploring distributions of mineral-associated organic carbon age and chemical composition across diverse soil mineralogies |
| author_facet |
Stoner, Shane Doetterl, Sebastian Trumbore, Susan Sierra, Carlos A. Schrumpf, Marion González-Pérez, José Antonio Hoyt, Alison |
| author_sort |
Stoner, Shane |
| title |
Exploring distributions of mineral-associated organic carbon age and chemical composition across diverse soil mineralogies |
| title_short |
Exploring distributions of mineral-associated organic carbon age and chemical composition across diverse soil mineralogies |
| title_full |
Exploring distributions of mineral-associated organic carbon age and chemical composition across diverse soil mineralogies |
| title_fullStr |
Exploring distributions of mineral-associated organic carbon age and chemical composition across diverse soil mineralogies |
| title_full_unstemmed |
Exploring distributions of mineral-associated organic carbon age and chemical composition across diverse soil mineralogies |
| title_sort |
exploring distributions of mineral-associated organic carbon age and chemical composition across diverse soil mineralogies |
| publisher |
American Geophysical Union |
| publishDate |
2022-12 |
| url |
http://hdl.handle.net/10261/310681 |
| work_keys_str_mv |
AT stonershane exploringdistributionsofmineralassociatedorganiccarbonageandchemicalcompositionacrossdiversesoilmineralogies AT doetterlsebastian exploringdistributionsofmineralassociatedorganiccarbonageandchemicalcompositionacrossdiversesoilmineralogies AT trumboresusan exploringdistributionsofmineralassociatedorganiccarbonageandchemicalcompositionacrossdiversesoilmineralogies AT sierracarlosa exploringdistributionsofmineralassociatedorganiccarbonageandchemicalcompositionacrossdiversesoilmineralogies AT schrumpfmarion exploringdistributionsofmineralassociatedorganiccarbonageandchemicalcompositionacrossdiversesoilmineralogies AT gonzalezperezjoseantonio exploringdistributionsofmineralassociatedorganiccarbonageandchemicalcompositionacrossdiversesoilmineralogies AT hoytalison exploringdistributionsofmineralassociatedorganiccarbonageandchemicalcompositionacrossdiversesoilmineralogies |
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