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    Acid hydrolysis to define a biologically-resistant pool is compromised by carbon loss and transformation

    Greenfield, LG; Gregorich, EG; van Kessel, C; Baldock, JA; Beare, MH; Billings, SA; Clinton, PW; Condron, Leo; Hill, SJ; Hopkins, DW; Janzen, HH
    Abstract
    Biologically-resistant carbon (C) comprises the bulk of C in most soils and is often estimated from chemical separation of a soil organic matter (SOM) fraction that is not hydrolysed by strong acid, and exhibits an older radiocarbon age and slower turnover than the whole SOM. Here we examine the effects of acid hydrolysis – the method used to separate the nonhydrolysable C – on the quantity, structure and isotopic makeup of C in pure model carbohydrates and those contained in senescent maize that resemble C inputs to SOM. We demonstrate that significant alterations occur during hydrolysis resulting in C mass losses (up to 75% preferential loss of ¹³C) and de novo synthesis of nonhydrolysable, ¹³C-depleted material dominated by aromatic > alkyl > carbonyl moieties. We infer that similar losses, and transformations of ¹⁴C, would partly explain the greater ages attributed to the chemically resistant C, seriously impairing the use of acid hydrolysis to identify this pool of SOM and that de novo synthesis during hydrolysis has obfuscated the true chemical nature of the nonhydrolysable fraction of SOM.... [Show full abstract]
    Keywords
    acid hydrolysis; carbon; ¹³C; resistant pool; soil organic matter
    Fields of Research
    0503 Soil Sciences; 050304 Soil Chemistry (excl. Carbon Sequestration Science); 050303 Soil Biology
    Date
    2013-09
    Type
    Journal Article
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    DOI
    https://doi.org/10.1016/j.soilbio.2013.04.009
    Metadata
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    Crown Copyright © 2013 Published by Elsevier Ltd. All rights reserved.
    Citation
    Greenfield et al. (2013). Acid hydrolysis to define a biologically-resistant pool is compromised by carbon loss and transformation. Soil Biology and Biochemistry, 64, 122-126. doi 10.1016/j.soilbio.2013.04.009
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