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Title: The accumulation of rhizodeposits in organo-mineral fractions promoted biochar-induced negative priming of native soil organic carbon in Ferralsol
Contributor(s): Weng, Zhe (Han)  (author); Van Zwieten, Lukas  (author); Singh, Bhupinderpal Pal  (author); Tavakkoli, Ehsan (author); Kimber, Stephen (author); Morris, Stephen (author); Macdonald, Lynne M (author); Cowie, Annette  (author)
Publication Date: 2018-03
DOI: 10.1016/j.soilbio.2017.12.008
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Organo-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.

Publication Type: Journal Article
Source of Publication: Soil Biology and Biochemistry, v.118, p. 91-96
Publisher: Elsevier Ltd
Place of Publication: United Kingdom
ISSN: 1879-3428
Fields of Research (FoR) 2020: 4101 Climate change impacts and adaptation
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article
School of Environmental and Rural Science

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