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dc.contributor.authorHuang, Doreen Yu-Tuanen_NZ
dc.contributor.authorLowe, David J.en_NZ
dc.contributor.authorChurchman, G. Jocken_NZ
dc.contributor.authorSchipper, Louis A.en_NZ
dc.contributor.authorCooper, Alanen_NZ
dc.contributor.authorChen, Tsan-Yaoen_NZ
dc.contributor.authorRawlence, Nicolas J.en_NZ
dc.date.accessioned2021-11-17T21:39:46Z
dc.date.available2021-11-17T21:39:46Z
dc.date.issued2021en_NZ
dc.identifier.issn2045-2322en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/14624
dc.description.abstractAllophanic tephra-derived soils can sequester sizable quantities of soil organic matter (SOM). However, no studies have visualized the fine internal porous structure of allophanic soil microaggregates, nor studied the carbon structure preserved in such soils or paleosols. We used synchrotron radiation-based transmission X-ray microscopy (TXM) to perform 3D-tomography of the internal porous structure of dominantly allophanic soil microaggregates, and carbon near-edge X-ray absorption fine-structure (C NEXAFS) spectroscopy to characterize SOM in ≤ 12,000-year-old tephra-derived allophane-rich (with minor ferrihydrite) paleosols. The TXM tomography showed a vast network of internal, tortuous nano-pores within an allophanic microaggregate comprising nanoaggregates. SOM in the allophanic paleosols at four sites was dominated by carboxylic/carbonyl functional groups with subordinate quinonic, aromatic, and aliphatic groups. All samples exhibited similar compositions despite differences between the sites. That the SOM does not comprise specific types of functional groups through time implies that the functional groups are relict. The SOM originated at the land/soil surface: ongoing tephra deposition (intermittently or abruptly) then caused the land-surface to rise so that the once-surface horizons were buried more deeply and hence became increasingly isolated from inputs by the surficial/modern organic cycle. The presence of quinonic carbon, from biological processes but vulnerable to oxygen and light, indicates the exceptional protection of SOM and bio-signals in allophanic paleosols, attributable both to the porous allophane (with ferrihydrite) aggregates that occlude the relict SOM from degradation, and to rapid burial by successive tephra-fallout, as well as strong Al-organic chemical bonding. TXM and C NEXAFS spectroscopy help to unravel the fine structure of soils and SOM and are of great potential for soil science studies.
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dc.language.isoenen_NZ
dc.publisherNature Portfolioen_NZ
dc.relation.urihttps://doi.org/10.1038/s41598-021-00109-9
dc.rightsThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
dc.subjectScience & Technologyen_NZ
dc.subjectMultidisciplinary Sciencesen_NZ
dc.subjectScience & Technology - Other Topicsen_NZ
dc.subjectNORTHERN NEW-ZEALANDen_NZ
dc.subjectCARBON STABILIZATIONen_NZ
dc.subjectC SEQUESTRATIONen_NZ
dc.subjectISLANDen_NZ
dc.subjectCLAYen_NZ
dc.subjectADSORPTIONen_NZ
dc.subjectMINERALSen_NZ
dc.subjectRECORDSen_NZ
dc.subjectNEXAFSen_NZ
dc.subjectMODELen_NZ
dc.titleCharacterizing porous microaggregates and soil organic matter sequestered in allophanic paleosols on Holocene tephras using synchrotron-based X-ray microscopy and spectroscopyen_NZ
dc.typeJournal Article
dc.identifier.doi10.1038/s41598-021-00109-9en_NZ
dc.relation.isPartOfScientific Reportsen_NZ
pubs.elements-id265503
pubs.issue1en_NZ
pubs.publication-statusPublisheden_NZ
pubs.volume11en_NZ
uow.identifier.article-noARTN 21310


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