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
• 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.
|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|
|Institution:||The University of York, The University of Sheffield|
|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|