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Dominant mycorrhizal association of trees alters carbon and nutrient cycling by selecting for microbial groups with distinct enzyme function
Swedish Univ Agr Sci, Uppsala Bioctr, Dept Forest Mycol & Plant Pathol, Uppsala, Sweden.;Indiana Univ, Dept Biol, 1001 E Third St, Bloomington, IN 47405 USA..
Indiana Univ, Dept Biol, 1001 E Third St, Bloomington, IN 47405 USA..
West Virginia Univ, Dept Biol, 53 Campus Dr, Morgantown, WV 26506 USA..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Evolutionary Biology.ORCID iD: 0000-0002-7003-5941
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2017 (English)In: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 214, no 1, 432-442 p.Article in journal (Refereed) Published
Abstract [en]

While it is well established that plants associating with arbuscular mycorrhizal (AM) and ectomycorrhizal (ECM) fungi cycle carbon (C) and nutrients in distinct ways, we have a limited understanding of whether varying abundance of ECM and AM plants in a stand can provide integrative proxies for key biogeochemical processes. We explored linkages between the relative abundance of AM and ECM trees and microbial functioning in three hardwood forests in southern Indiana, USA. Across each site's 'mycorrhizal gradient', we measured fungal biomass, fungal : bacterial (F : B) ratios, extracellular enzyme activities, soil carbon : nitrogen ratio, and soil pH over a growing season. We show that the percentage of AM or ECM trees in a plot promotes microbial communities that both reflect and determine the C to nutrient balance in soil. Soils dominated by ECM trees had higher F : B ratios and more standing fungal biomass than AM stands. Enzyme stoichiometry in ECM soils shifted to higher investment in extracellular enzymes needed for nitrogen and phosphorus acquisition than in C-acquisition enzymes, relative to AM soils. Our results suggest that knowledge of mycorrhizal dominance at the stand or landscape scale may provide a unifying framework for linking plant and microbial community dynamics, and predicting their effects on ecological function.

Place, publisher, year, edition, pages
2017. Vol. 214, no 1, 432-442 p.
Keyword [en]
arbuscular mycorrhizal (AM) fungi, carbon : nitrogen (C : N) ratio, ectomycorrhizal (ECM) fungi, enzyme stoichiometry, ergosterol, extracellular enzymes, fungal : bacterial (F : B) ratio, temperate forest
National Category
Evolutionary Biology
Identifiers
URN: urn:nbn:se:uu:diva-321440DOI: 10.1111/nph.14343ISI: 000398130300039PubMedID: 27918073OAI: oai:DiVA.org:uu-321440DiVA: diva2:1094112
Available from: 2017-05-09 Created: 2017-05-09 Last updated: 2017-05-31Bibliographically approved

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