| Autor: |
Lekberg Y; MPG Ranch, Missoula, MT, USA. ylekberg@mpgranch.com.; Department of Ecosystem and Conservation Sciences, University of Montana, Missoula, MT, USA. ylekberg@mpgranch.com., Arnillas CA; Department of Physical and Environmental Sciences, University of Toronto - Scarborough, Scarborough, Canada., Borer ET; Department of Ecology, Evolution, and Behavior, University of Minnesota, St Paul, MN, USA., Bullington LS; MPG Ranch, Missoula, MT, USA., Fierer N; Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO, USA.; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA., Kennedy PG; Departments of Plant Biology and Ecology, University of Minnesota, St Paul, MN, USA., Leff JW; Independent Researcher, Boulder, CO, USA., Luis AD; Department of Ecosystem and Conservation Sciences, University of Montana, Missoula, MT, USA., Seabloom EW; Department of Ecology, Evolution, and Behavior, University of Minnesota, St Paul, MN, USA., Henning JA; Department of Ecology, Evolution, and Behavior, University of Minnesota, St Paul, MN, USA.; Department of Biology, University of South Alabama, Mobile, AL, USA. |
| Abstrakt: |
Ecosystems across the globe receive elevated inputs of nutrients, but the consequences of this for soil fungal guilds that mediate key ecosystem functions remain unclear. We find that nitrogen and phosphorus addition to 25 grasslands distributed across four continents promotes the relative abundance of fungal pathogens, suppresses mutualists, but does not affect saprotrophs. Structural equation models suggest that responses are often indirect and primarily mediated by nutrient-induced shifts in plant communities. Nutrient addition also reduces co-occurrences within and among fungal guilds, which could have important consequences for belowground interactions. Focusing only on plots that received no nutrient addition, soil properties influence pathogen abundance globally, whereas plant community characteristics influence mutualists, and climate influence saprotrophs. We show consistent, guild-level responses that enhance our ability to predict shifts in soil function related to anthropogenic eutrophication, which can have longer-term consequences for plant communities. |
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