LCZO -- Soil Biogeochemistry -- Enrichment of Lignin-Derived Carbon in SOM -- Luquillo Mountains -- (2019-2019)
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| Owners: | CZO Luquillo |
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| Created: | Apr 24, 2020 at 3:27 p.m. |
| Last updated: | Apr 24, 2020 at 3:41 p.m. |
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Abstract
A modern paradigm of soil organic matter proposes that persistent carbon (C) derives primarily from microbial residues interacting with minerals, challenging older ideas that lignin moieties contribute to soil C because of inherent recalcitrance. We proposed that aspects of these old and new paradigms can be partially reconciled by considering interactions between lignin decomposition products and redox-sensitive iron (Fe) minerals. An Fe-rich tropical soil (with C4 litter and either 13C-labeled or unlabeled lignin) was pretreated with different durations of anaerobiosis (0–12 days) and incubated aerobically for 317 days. Only 5.7 ± 0.2% of lignin 13C was mineralized to CO2 versus 51.2 ± 0.4% of litter C. More added lignin-derived C (48.2 ± 0.9%) than bulk litter-derived C (30.6 ± 0.7%) was retained in mineral-associated organic matter (MAOM; density >1.8 g cm–3), and 12.2 ± 0.3% of lignin-derived C vs 6.4 ± 0.1% of litter C accrued in clay-sized (<2 μm) MAOM. Longer anaerobic pretreatments increased added lignin-derived C associated with Fe, according to extractions and nanoscale secondary ion mass spectrometry (NanoSIMS). Microbial residues are important, but lignin-derived C may also contribute disproportionately to MAOM relative to bulk litter-derived C, especially following redox-sensitive biogeochemical interactions.
https://doi.org/10.1021/acs.est.9b01834
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| The content of this resource is derived from | https://doi.org/10.1021/acs.est.9b01834 |
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Funding Agencies
This resource was created using funding from the following sources:
| Agency Name | Award Title | Award Number |
|---|---|---|
| NSF | DEB-1457805 | |
| NSF | DEB-1802745 | |
| NSF | EAR-1331841 | |
| DOE | BER DE-FC02-07ER64494 | |
| DOE | BER DE-SC0012742 | |
| National Natural Science Foundation of China | 31670487 |
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This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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