The accumulation of rhizodeposits in organo-mineral fractions promoted biochar-induced negative priming of native soil organic carbon in Ferralsol
Open accessAbstract
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.
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Biochar sorbs soil organic matter directly and forms aggregates, thus preventing organic matter from being used by microorganisms.
“Secondly, biochar sorbs soil organic matter directly and form aggregates, thus preventing organic matter from being used by microorganisms (Weng et al. 2018; Zheng et al. 2021).”
From Role of biochar toward carbon neutrality (2023) · cites this paper as Weng et al. 2018
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- Authors
- Weng, Z. (., Van Zwieten, L., Singh, B. P., Tavakkoli, E., Kimber, S., Morris, S., Macdonald, L. M., & Cowie, A.
- Affiliations
- New South Wales Department of Primary Industries (AU)
- Charles Sturt University (AU)
- Commonwealth Scientific and Industrial Research Organisation (AU)
- ORCID
- Venue
- Soil Biology and Biochemistry
- Publisher
- Elsevier BV
- Published
- 2018-03
- Volume
- 118
- Pages
- 91-96
- ISSN
- 0038-0717 (ISSN-L)
- OpenAlex
- W2777965025
- Cited by
- 44
- References
- 30
- Citations by year
- 2026: 7 · 2025: 5 · 2024: 9 · 2023: 5 · 2022: 4 · 2021: 5 · 2020: 5 · 2019: 3 · 2018: 1
- FWCI
- 2.70
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- www.elsevier.com/tdm/userlicense/1.0/ (tdm)
- www.elsevier.com/legal/tdmrep-license (tdm)
- www.elsevier.com/open-access/userlicense/1.0/ (am, 296 d)
- doi.org/10.15223/policy-017 (stm-asf)
- doi.org/10.15223/policy-037 (stm-asf)
- doi.org/10.15223/policy-012 (stm-asf)
- doi.org/10.15223/policy-029 (stm-asf)
- doi.org/10.15223/policy-004 (stm-asf)
- Locations
- Soil Biology and Biochemistry (acceptedVersion)
- Griffith Research Online (submittedVersion, other-oa)
- RUNE (Research UNE) (submittedVersion)
- Funders
- Department of Agriculture, Fisheries and Forestry, Australian Government
- Australian Synchrotron (AS151_SXR_9599)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Mycorrhizal Fungi and Plant Interactions
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil erosion and sediment transport
- Keywords
- biochar, negative priming, soil organic carbon, rhizodeposits, organo-mineral interactions, Ferralsols, 13C pulse labeling, root respiration, macroaggregates, Lolium multiflorum
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