Molecular complexity and diversity of persistent soil organic matter

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dc.contributor.authorJones, ARen_AU
dc.contributor.authorDalal, RCen_AU
dc.contributor.authorGupta, VVSRen_AU
dc.contributor.authorSchmidt, Sen_AU
dc.contributor.authorAllen, DEen_AU
dc.contributor.authorJacobsen, GEen_AU
dc.contributor.authorBird, MIen_AU
dc.contributor.authorGrandy, ASen_AU
dc.contributor.authorSanderman, Jen_AU
dc.date.accessioned2023-12-21T23:30:06Zen_AU
dc.date.available2023-12-21T23:30:06Zen_AU
dc.date.issued2023-09en_AU
dc.date.statistics2023-06-23en_AU
dc.description.abstractManaging and increasing organic matter in soil requires greater understanding of the mechanisms driving its persistence through resistance to microbial decomposition. Conflicting evidence exists for whether persistent soil organic matter (SOM) is molecularly complex and diverse. As such, this study used a novel application of graph networks with pyrolysis-gas chromatography-mass spectrometry to quantify the complexity and diversity of persistent SOM, defined as SOM that persists through time (soil radiocarbon age) and soil depth. We analyzed soils from the Cooloola giant podzol chronosequence across a large gradient of soil depths (0–15 m) and SOM radiocarbon ages (modern to 19,000 years BP). We found that the most persistent SOM on this gradient was highly aromatic and had the lowest molecular complexity and diversity. By contrast, fresh surface SOM had higher molecular complexity and diversity, with high contributions of plant-derived lignins and polysaccharides. These findings indicate that persisting SOM declines in molecular complexity and diversity over geological timescales and soil depths, with aromatic SOM compounds persisting longer with mineral association. © 2023 Elsevier Ltden_AU
dc.description.sponsorshipWe thank the DES Soil and Chemistry Centre at Ecosciences Precinct, Brisbane, for their support, CSIRO National Soil Archive, Canberra, for use of their samples, and Alexander Burridge for producing illustrations. We are grateful to Jan Skjemstad, Rob Fitzpatrick, Fred Oudyn, and Klaus Kaiser for insightful discussions on the topic matter and Thomas Orton for statistical assistance. This works was supported by CSIRO and AINSE postgraduate research scholarships (PGRA ALNSTU11910) to Andrew Jones, and ANSTO research grants #11007 and #11853 for radiocarbon dating. We acknowledge the financial support from the Australian Government for the Centre for Accelerator Science at ANSTO through the National Collaborative Research Infrastructure Strategy (NCRIS).en_AU
dc.identifier.articlenumber109061en_AU
dc.identifier.citationJones, A. R., Dalal, R. C., Gupta, V. V. S. R., Schmidt, S., Allen, D. E., Jacobsen, G. E., Bird, M., Grandy, A. S., & Sanderman, J. (2023). Molecular complexity and diversity of persistent soil organic matter. Soil Biology and Biochemistry, 184, 109061. doi:10.1016/j.soilbio.2023.109061en_AU
dc.identifier.issn0038-0717en_AU
dc.identifier.journaltitleSoil Biology and Biochemistryen_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15298en_AU
dc.identifier.volume184en_AU
dc.language.isoenen_AU
dc.publisherElseiver B. V.en_AU
dc.relation.urihttps://doi.org/https://doi.org/10.1016/j.soilbio.2023.109061en_AU
dc.subjectSoilsen_AU
dc.subjectOrganic matteren_AU
dc.subjectDecompositionen_AU
dc.subjectGas chromatographyen_AU
dc.subjectMass spectroscopyen_AU
dc.subjectLigninen_AU
dc.subjectMineralsen_AU
dc.titleMolecular complexity and diversity of persistent soil organic matteren_AU
dc.typeJournal Articleen_AU
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