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Nitrogen dynamics of decomposing Scots pine needle litter depends on colonizing fungal species
Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics. CNRS, Laboratoire de Géologie de l’ENS, Ecole Normale Supérieure, Paris, France.
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2019 (English)In: FEMS Microbiology Ecology, ISSN 0168-6496, E-ISSN 1574-6941, Vol. 95, no 6, article id fiz059Article in journal (Refereed) Published
Abstract [en]

In boreal ecosystems plant production is often limited by low availability of nitrogen. Nitrogen retention in below-ground organic pools plays an important role in restricting recirculation to plants and thereby hampers forest production. Saprotrophic fungi are commonly assigned to different decomposer strategies, but how these relate to nitrogen cycling remains to be understood. Decomposition of Scots pine needle litter was studied in axenic microcosms with the ligninolytic litter decomposing basidiomycete Gymnopus androsaceus or the stress tolerant ascomycete Chalara longipes. Changes in chemical composition were followed by C-13 CP/MAS NMR spectroscopy and nitrogen dynamics was assessed by the addition of a N-15 tracer. Decomposition by C. longipes resulted in nitrogen retention in non-hydrolysable organic matter, enriched in aromatic and alkylic compounds, whereas the ligninolytic G. androsaceus was able to access this pool, counteracting nitrogen retention. Our observations suggest that differences in decomposing strategies between fungal species play an important role in regulating nitrogen retention and release during litter decomposition, implying that fungal community composition may impact nitrogen cycling at the ecosystem level.

Place, publisher, year, edition, pages
Oxford University Press, 2019. Vol. 95, no 6, article id fiz059
Keywords [en]
saprotrophic fungi, litter decomposition, C-13 CP/MAS NMR, nitrogen cycling, N-15 tracer, functional guilds
National Category
Soil Science Environmental Sciences related to Agriculture and Land-use
Identifiers
URN: urn:nbn:se:umu:diva-161859DOI: 10.1093/femsec/fiz059ISI: 000474762800003PubMedID: 31069387OAI: oai:DiVA.org:umu-161859DiVA, id: diva2:1341107
Available from: 2019-08-07 Created: 2019-08-07 Last updated: 2019-08-07Bibliographically approved

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Soucémarianadin, Laure N.Schleucher, Jürgen

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Soucémarianadin, Laure N.Schleucher, JürgenLindahl, Björn D.
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CiteExportLink to record
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