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In situ 13CO2 pulse-labelling of upland grassland demonstrates a rapid pathway of carbon flux from arbuscular mycorrhizal mycelia to the soil

Johnson, D., Leake, J.R., Ostle, N., Ineson, P. and Read, D.J. (2002) In situ 13CO2 pulse-labelling of upland grassland demonstrates a rapid pathway of carbon flux from arbuscular mycorrhizal mycelia to the soil. New Phytologist, 153 (2). pp. 327-334. ISSN 0028-646X

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Abstract

• The flux of pulse-derived 13C from upland pasture plants to the external mycelium of their arbuscular mycorrhizal (AM) symbionts was traced and quantified over a 7-d post-labelling period.

• Mesh cores, which allowed in-growth of native AM mycelium but were impenetrable to roots, were inserted into unlimed and limed plots and the surrounding vegetation was exposed to 13CO2 at ambient CO2 concentrations.

• Release of 13CO2 from cores colonized by AM mycelium peaked 9–14 h after labelling and declined within 24 h after severance of mycelial connections to roots. Between 5 and 8% of carbon lost by plants was respired by AM mycelium over the first 21 h after labelling. Liming increased the amount of carbon fixed by plants and subsequently allocated to fine roots and AM mycelium.

• The results demonstrate for the first time under field conditions that AM mycelia provide a rapid and important pathway of carbon flux from plants to the soil and atmosphere.

Item Type: Article
Copyright, Publisher and Additional Information: Open access copy available from the journal web site.
Keywords: C-13, stable isotope, liming, carbon flow, carbon cycling, respiration, arbuscular mycorrhiza, mesh cores
Academic Units: The University of York > Biology (York)
The University of Sheffield > Faculty of Science (Sheffield) > School of Biological Sciences (Sheffield) > Department of Animal and Plant Sciences (Sheffield)
Depositing User: Open Access From Journal
Date Deposited: 22 Dec 2008 15:31
Last Modified: 22 Dec 2008 15:31
Published Version: http://dx.doi.org/10.1046/j.0028-646X.2001.00316.x
Status: Published
Publisher: Wiley-Blackwell
Refereed: Yes
Identification Number: 10.1046/j.0028-646X.2001.00316.x
URI: http://eprints.whiterose.ac.uk/id/eprint/5104

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