Please use this identifier to cite or link to this item:
https://hdl.handle.net/1959.11/58435
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 |
Handle Link: | https://hdl.handle.net/1959.11/58435 |
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.
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 0038-0717 |
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
|
Files in This Item:
1 files
Show full item record
Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.