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Nitrogen dynamics of decomposing Scots pine needle litter depends on colonizing fungal species
Swedish University of Agricultural Sciences, Department of Ecology, Uppsala, Sweden.
Örebro universitet, Institutionen för naturvetenskap och teknik.ORCID-id: 0000-0003-4384-5014
CNRS, Laboratoire de Géologie de l'ENS, Ecole Normale Supérieure, Paris, France; Umeå University, Department of Medical Biochemistry and Biophysics, Umeå, Sweden.
Swedish University of Agricultural Sciences, Department of Ecology, Uppsala, Sweden.
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2019 (Engelska)Ingår i: FEMS Microbiology Ecology, ISSN 0168-6496, E-ISSN 1574-6941, Vol. 95, nr 6, artikel-id fiz059Artikel i tidskrift (Refereegranskat) 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 13C CP/MAS NMR spectroscopy and nitrogen dynamics was assessed by the addition of a 15N 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.

Ort, förlag, år, upplaga, sidor
Oxford University Press, 2019. Vol. 95, nr 6, artikel-id fiz059
Nyckelord [en]
13C CP/MAS NMR, 15N tracer, functional guilds, litter decomposition, nitrogen cycling, saprotrophic fungi
Nationell ämneskategori
Ekologi Mikrobiologi
Identifikatorer
URN: urn:nbn:se:oru:diva-74566DOI: 10.1093/femsec/fiz059ISI: 000474762800003PubMedID: 31069387Scopus ID: 2-s2.0-85065782720OAI: oai:DiVA.org:oru-74566DiVA, id: diva2:1320401
Forskningsfinansiär
Forskningsrådet Formas, 2011-1747Tillgänglig från: 2019-06-04 Skapad: 2019-06-04 Senast uppdaterad: 2019-07-29Bibliografiskt granskad

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