Peatland Fungal Community Responses to Nutrient Enrichment: A Story Beyond Nitrogen.

Autor: Wang M; Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun, Jilin, China.; State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, Institute for Peat and Mire Research, Northeast Normal University, Changchun, Jilin, China., Lamit LJ; Department of Biology, Syracuse University, Syracuse, New York, USA., Lilleskov EA; USDA Forest Service, Northern Research Station, Houghton, Michigan, USA., Basiliko N; Faculty of Natural Resources Management, Lakehead University, Thunder Bay, Ontario, Canada.; Vale Living With Lakes Centre, Laurentian University, Sudbury, Ontario, Canada., Moore TR; Department of Geography, McGill University, Montreal, Quebec, Canada., Bubier JL; Department of Environmental Studies, Mount Holyoke College, South Hadley, Massachusetts, USA., Guo G; Vale Living With Lakes Centre, Laurentian University, Sudbury, Ontario, Canada.; School of Pharmaceutical Sciences, University of Ottawa, Ottawa, Ontario, Canada., Juutinen S; Finnish Meteorological Institute, Climate System Research, Helsinki, Finland., Larmola T; Natural Resources Institute Finland (Luke), Helsinki, Finland.
Jazyk: angličtina
Zdroj: Global change biology [Glob Chang Biol] 2024 Nov; Vol. 30 (11), pp. e17562.
DOI: 10.1111/gcb.17562
Abstrakt: Anthropogenically elevated inputs of nitrogen (N), phosphorus (P), and potassium (K) can affect the carbon (C) budget of nutrient-poor peatlands. Fungi are intimately tied to peatland C budgets due to their roles in organic matter decomposition and symbioses with primary producers; however, the influence of fertilization on peatland fungal composition and diversity remains unclear. Here, we examined the effect of fertilization over 10 years on fungal diversity, composition, and functional guilds along an acrotelm (10-20 cm), mesotelm (30-40 cm), and catotelm (60-70 cm) depth gradient at the Mer Bleue bog, Canada. Simultaneous N and PK additions decreased the relative abundance of ericoid mycorrhizal fungi and increased ectomycorrhizal fungi and lignocellulose-degrading fungi. Fertilization effects were not more pronounced in the acrotelm relative to the catotelm, nor was there a shift toward nitrophilic taxa after N addition. The direct effect of fertilization significantly decreased the abundance of Sphagnum-associated fungi, primarily owing to the overarching role of limiting nutrients rather than a decline in Sphagnum cover. Increased nutrient loading may threaten peatland C stocks if lignocellulose-degrading fungi become abundant and accelerate decomposition of recalcitrant organic matter. Additionally, future changes in plant communities, strong water table fluctuations, and peat subsidence after long-term nutrient loading may also influence fungal functional guilds and depth-dependencies of fungal community structure.
(© 2024 John Wiley & Sons Ltd.)
Databáze: MEDLINE
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