Journal article
The accumulation of rhizodeposits in organo-mineral fractions promoted biochar-induced negative priming of native soil organic carbon in Ferralsol
Soil biology & biochemistry, Vol.118, pp.91-96
03/2018
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Abstract
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.
Details
- Title
- The accumulation of rhizodeposits in organo-mineral fractions promoted biochar-induced negative priming of native soil organic carbon in Ferralsol
- Creators
- Zhe (Han) Weng - Wollongbar Primary Ind Inst, NSW Dept Primary Ind, Wollongbar, NSW 2477, AustraliaLukas Van Zwieten - New South Wales Department of Primary IndustriesBhupinder Pal Singh - New South Wales Department of Primary IndustriesEhsan Tavakkoli - Charles Sturt UniversityStephen Kimber - New South Wales Department of Primary IndustriesStephen Morris - New South Wales. Department of Primary IndustriesLynne M. Macdonald - Commonwealth Scientific and Industrial Research OrganisationAnnette Cowie - University of New England
- Publication Details
- Soil biology & biochemistry, Vol.118, pp.91-96
- Publisher
- Elsevier
- Number of pages
- 6
- Grant note
- Department of Agriculture, Fisheries and Forestry (DAFF) National Biochar Initiative II (NBI II) AS151_SXR_9599 / Australian Synchrotron, Victoria, Australia
- Identifiers
- 991013054663502368
- Copyright
- Crown Copyright © 2017 Published by Elsevier Ltd. All rights reserved.
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article