Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/29250
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Rhizosphere carbon supply accelerates soil organic matter decomposition in the presence of fresh organic substrates
Author(s): Jackson, Oyindamola
Quilliam, Richard
Stott, Andy
Grant, Helen
Subke, Jens-Arne
Contact Email: jens-arne.subke@stir.ac.uk
Keywords: Soil CO2 efflux
Ectomycorrhizal fungi
Priming effect
Soil Microbial activity
Stable C isotopes
Issue Date: Jul-2019
Citation: Jackson O, Quilliam R, Stott A, Grant H & Subke J (2019) Rhizosphere carbon supply accelerates soil organic matter decomposition in the presence of fresh organic substrates. Plant and Soil, 440 (1-2), pp. 473-490. https://doi.org/10.1007/s11104-019-04072-3
Abstract: Background and aims Belowground C supply from plant roots may accelerate the decomposition of SOM through the rhizosphere priming effect, but the detailed interaction between substrate quality and rhizosphere C supply is poorly understood. We hypothesize that decomposition of organic matter is enhanced by the combined effect of assimilate C supply to the rhizosphere and substrate amendments. Methods Birch trees (Betula pendula) planted in experimental mesocosms; half of these trees were shaded to reduce the supply of assimilate C to roots and ECM fungi. Either 13C-enriched glucose, straw, fungal necromass or C4 biochar were subsequently added to each mesocosm. CO2 efflux derived from substrates were separated from that derived from native SOM and roots based on the isotopic composition of total respired CO2. Results The addition of all substrates increased fluxes in both un-shaded and shaded treatments, with greatest total CO2 efflux observed in soils amended with straw. Increases in un-labelled CO2 were observed to be greater in the presence of belowground C supply than in mesocosms with shaded trees. Conclusions Turnover of SOM is closely linked to belowground C allocation. The biochemical quality and recalcitrance of litter entering the soil C pool is of critical importance to this priming, as is the interaction with rhizosphere-associated decomposition activity.
DOI Link: 10.1007/s11104-019-04072-3
Rights: © The Author(s) 2019 This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Licence URL(s): http://creativecommons.org/licenses/by/4.0/

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