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dc.contributor.authorWeng, Zhe Han
dc.contributor.authorVan Zwieten, Lukas
dc.contributor.authorSingh, Bhupinder Pal
dc.contributor.authorTavakkoli, Ehsan
dc.contributor.authorKimber, Stephen
dc.contributor.authorMorris, Stephen
dc.contributor.authorMacdonald, Lynne M
dc.contributor.authorCowie, Annette
dc.description.abstractOrgano-mineral interactions control the stabilisation of soil organic matter (SOM) in mineral soils. Biochar can enhance these interactions via a range of mechanisms including Al-dominant cation bridging in acidic soils, ligand exchange, H-bonding, and π- π-bonding with polycyclic aromatics. But, field-based evidence of their magnitude is lacking. Here we assessed the role of organo-mineral interactions on the observed biochar-induced negative priming of native soil organic carbon (SOC) in a Ferralsol under annual ryegrass. Using repeated pulse labelling, the magnitude of production and fate of recently photosynthesised 13C was traced amongst: soil plus root respiration, root biomass, soil aggregates and aggregate-associated C fractions. Biochar (Eucalyptus saligna, 450 °C) amendment (30 Mg ha−1) increased total belowground 13C recovery by 10% compared to the unamended control over the 12 month sampling period. We detected the greatest quantity of rhizodeposit in the mineral-protected SOM within macroaggregates (250–2000 μm). Through synchrotron-based spectroscopic analysis of bulk soils, we provide evidence of a mechanism for biochar-induced negative priming which is the accumulation of rhizodeposits in organo-mineral (i.e. aggregate-protected and silt/clay-bound) fractions.
dc.relation.ispartofjournalSoil Biology and Biochemistry
dc.subject.fieldofresearchEnvironmental Sciences
dc.subject.fieldofresearchBiological Sciences
dc.subject.fieldofresearchAgricultural and Veterinary Sciences
dc.subject.keywordsScience & Technology
dc.subject.keywordsLife Sciences & Biomedicine
dc.subject.keywordsSoil Science
dc.subject.keywordsNegative priming
dc.titleThe accumulation of rhizodeposits in organo-mineral fractions promoted biochar-induced negative priming of native soil organic carbon in Ferralsol
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationWeng, ZH; Van Zwieten, L; Singh, BP; Tavakkoli, E; Kimber, S; Morris, S; Macdonald, LM; Cowie, A, The accumulation of rhizodeposits in organo-mineral fractions promoted biochar-induced negative priming of native soil organic carbon in Ferralsol, Soil Biology and Biochemistry, 2018, 118, pp. 91-96
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gro.griffith.authorVan Zwieten, Lukas

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