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Title: Enrichment of lignin-derived carbon in mineral-associated soil organic matter

Source: Environmental Science & Technology. 53(13): 7522-7531.

Author(s)Huang, Wenjuan ; Hammel, Kenneth E.; Hao, Jialong ; Thompson, Aaron ; Timokhin, Vitaliy I; Hall, Steven J.

Publication Year: 2019  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4712-2B

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 ?m) 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.

Keywords: Lignin; carbon; soil organic matter; iron; microbial residues

Publication Review Process: Formally Refereed

File size: 2,048 kb(s)

Date posted: 05/28/2020

This publication is also viewable on Treesearch:  view
RITS Product ID: 97896
Current FPL Scientist associated with this product
Hammel, Kenneth E.
Research Chemist

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