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Contrasting effects of ectomycorrhizal fungi on early and late stage decomposition in a boreal forest
Swedish University of Agricultural Sciences, Uppsala BioCenter, Department of Forest Mycology and Plant Pathology, Uppsala, Sweden.
Swedish University of Agricultural Sciences, Uppsala BioCenter, Department of Forest Mycology and Plant Pathology, Uppsala, Sweden.
Örebro University, School of Science and Technology.ORCID iD: 0000-0003-4384-5014
Swedish University of Agricultural Sciences, Uppsala BioCenter, Department of Forest Mycology and Plant Pathology, Uppsala, Sweden.
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2018 (English)In: The ISME Journal, ISSN 1751-7362, E-ISSN 1751-7370Article in journal (Refereed) Epub ahead of print
Abstract [en]

Symbiotic ectomycorrhizal fungi have received increasing attention as regulators of below-ground organic matter storage. They are proposed to promote organic matter accumulation by suppressing saprotrophs, but have also been suggested to play an active role in decomposition themselves. Here we show that exclusion of tree roots and associated ectomycorrhizal fungi in a boreal forest increased decomposition of surface litter by 11% by alleviating nitrogen limitation of saprotrophs-a "Gadgil effect". At the same time, root exclusion decreased Mn-peroxidase activity in the deeper mor layer by 91%. Our results show that ectomycorrhizal fungi may hamper short-term litter decomposition, but also support a crucial role of ectomycorrhizal fungi in driving long-term organic matter oxidation. These observations stress the importance of ectomycorrhizal fungi in regulation of below-ground organic matter accumulation. By different mechanisms they may either hamper or stimulate decomposition, depending upon stage of decomposition and location in the soil profile.

Place, publisher, year, edition, pages
Nature Publishing Group, 2018.
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Soil Science
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URN: urn:nbn:se:oru:diva-67218DOI: 10.1038/s41396-018-0181-2PubMedID: 29880913OAI: oai:DiVA.org:oru-67218DiVA, id: diva2:1216401
Available from: 2018-06-11 Created: 2018-06-11 Last updated: 2018-06-11Bibliographically approved

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Ekblad, Alf

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CiteExportLink to record
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