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Enrichment of Lignin-Derived Carbon in Mineral-Associated Soil Organic Matter

机译：矿产相关土壤有机物中木质素衍生碳的富集

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摘要

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 redoxsensitive iron (Fe) minerals. An Fe-rich tropical soil (with C-4 litter and either C-13-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 C-13 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 mu 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.
机译：土壤有机物的现代范式提出，持久性碳（C）主要来自与矿物相互作用的微生物残留物，挑战木质素部分由于固有的批量性而对土壤C产生贡献。我们提出，通过考虑木质素分解产物和氧化辛铁（Fe）矿物质之间的相互作用，可以部分地和解这些旧的范式的方面。 Fe富含Fe的热带土壤（用C-4垃圾和C-13标记或未标记的木质素）用不同的厌氧症（0-12天）进行预处理，并促进917天。只有5.7 +/- 0.2％的木质素C-13矿化为CO 2，而51.2 +/- 0.4％的垃圾C.更多地添加木质素衍生的C（48.2 +/- 0.9％）比散装垃圾衍生的C（30.6 + / - 0.7％）保留在矿物相关的有机物质（MAOM;密度> 1.8g cm（-3）），12.2 +/- 0.3％的木质素衍生的C vs 6.4 +/- 0.1％的垃圾c在粘土大小（<2μm）maom。根据萃取和纳米级二次离子质谱（纳米键），厌氧预处理较长的厌氧预处理增加了与Fe相关的木质素衍生的C.微生物残留是重要的，但木质素衍生的C也可以相对于散装凋落衍生的C不成比例地促进MAOM，尤其是在氧化氢敏感生物地球化学相互作用之后。

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  • 来源
    《Environmental Science & Technology》 |2019年第13期|7522-7531|共10页
  • 作者

    Huang Wenjuan; Hammel Kenneth E.; Hao Jialong; Thompson Aaron; Timokhin Vitaliy I.; Hall Steven J.;

  • 作者单位

    Iowa State Univ Dept Ecol Evolut & Organismal Biol Ames IA 50011 USA|Chinese Acad Sci Key Lab Vegetat Restorat & Management Degraded Ec South China Bot Garden Guangzhou 510650 Guangdong Peoples R China;

    US Forest Serv Madison WI 53726 USA|Univ Wisconsin Dept Bacteriol Madison WI 53706 USA;

    Chinese Acad Sci Inst Geol & Geophys Key Lab Earth & Planetary Phys Beijing 100029 Peoples R China;

    Univ Georgia Dept Crop & Soil Sci Athens GA 30602 USA;

    Univ Wisconsin Wisconsin Energy Inst DOE Great Lakes Bioenergy Res Ctr Madison WI 53706 USA;

    Iowa State Univ Dept Ecol Evolut & Organismal Biol Ames IA 50011 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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