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Ectomycorrhizal fungi integrate nitrogen mobilisation and mineral weathering in boreal forest soil
Department of Forest Mycology and Plant Pathology, Uppsala BioCenter, Swedish University of Agricultural Sciences, Box 7026, SE-750 07, Uppsala, Sweden.
Department of Forest Mycology and Plant Pathology, Uppsala BioCenter, Swedish University of Agricultural Sciences, Box 7026, SE-750 07, Uppsala, Sweden.
UFR des Sciences de la Terre et des Ressources Minières, Département des Sciences du sol, Université Felix Houphouët-Boigny, 22 BP 582, Abidjan, Côte d'Ivoire.
Department of Forest Mycology and Plant Pathology, Uppsala BioCenter, Swedish University of Agricultural Sciences, Box 7026, SE-750 07, Uppsala, Sweden.
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2024 (English)In: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 242, no 4, p. 1545-1560Article in journal (Refereed) Published
Abstract [en]

Tree growth in boreal forests is driven by ectomycorrhizal fungal mobilisation of organic nitrogen and mineral nutrients in soils with discrete organic and mineral horizons. However, there are no studies of how ectomycorrhizal mineral weathering and organic nitrogen mobilisation processes are integrated across the soil profile. We studied effects of organic matter (OM) availability on ectomycorrhizal functioning by altering the proportions of natural organic and mineral soil in reconstructed podzol profiles containing Pinus sylvestris plants, using 13 CO2 pulse labelling, patterns of naturally occurring stable isotopes (26 Mg and 15 N) and high-throughput DNA sequencing of fungal amplicons. Reduction in OM resulted in nitrogen limitation of plant growth and decreased allocation of photosynthetically derived carbon and mycelial growth in mineral horizons. Fractionation patterns of 26 Mg indicated that magnesium mobilisation and uptake occurred primarily in the deeper mineral horizon and was driven by carbon allocation to ectomycorrhizal mycelium. In this horizon, relative abundance of ectomycorrhizal fungi, carbon allocation and base cation mobilisation all increased with increased OM availability. Allocation of carbon through ectomycorrhizal fungi integrates organic nitrogen mobilisation and mineral weathering across soil horizons, improving the efficiency of plant nutrient acquisition. Our findings have fundamental implications for sustainable forest management and belowground carbon sequestration.

Place, publisher, year, edition, pages
John Wiley & Sons, 2024. Vol. 242, no 4, p. 1545-1560
Keywords [en]
Boreal forests, carbon allocation, carbon sequestration, ectomycorrhizal fungi, mineral weathering, nitrogen mobilisation, organic matter, podzol horizons
National Category
Forest Science
Identifiers
URN: urn:nbn:se:oru:diva-108244DOI: 10.1111/nph.19260ISI: 001065652400001PubMedID: 37697631Scopus ID: 2-s2.0-85170655570OAI: oai:DiVA.org:oru-108244DiVA, id: diva2:1796449
Funder
Swedish Research Council Formas, 2011-01691 2014-1272Science for Life Laboratory, SciLifeLab
Note

Funding was provided by The Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning (FORMAS) grant nos. 2011-01691 (KB, RDF) and 2014-1272 (RDF, SM) and the Swedish University of Agricultural Sciences (SLU). The authors would like to acknowledge the support of the National Genomics Infrastructure (NGI)/Uppsala Genome Center and UPPMAX for providing assistance in massive parallel sequencing and computational infrastructure. Work performed at NGI/Uppsala Genome Center has been funded by RFI/VR and Science for Life Laboratory, Sweden. 

Available from: 2023-09-12 Created: 2023-09-12 Last updated: 2024-07-24Bibliographically approved

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