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Glob Chang Biol. 2018 Dec;24(12):5642-5654. doi: 10.1111/gcb.14440. Epub 2018 Oct 9.

Cascading effects from plants to soil microorganisms explain how plant species richness and simulated climate change affect soil multifunctionality.

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Departamento de Biología y Geología, Física y Química Inorgánica, Escuela Superior de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, Móstoles, Spain.
Department of Botany, University of South Bohemia, Ceske Budejovice, Czech Republic.
INRA, USC1339 Chizé (CEBC), Villiers en Bois, France.
Centre d'étude biologique de Chizé, CNRS-Université La Rochelle (UMR 7372), Villiers en Bois, France.
Departamento de Ingeniería Forestal, Escuela Técnica Superior de Ingeniería Agronómica y de Montes, Universidad de Córdoba, Córdoba, Spain.
Institute of Ecology and Earth Sciences, University of Tartu, Tartu, Estonia.
Hawkesbury Institute for the Environment, University of Western Sydney, Penrith, NSW, Australia.
Zoologisches Institut, Terrestrische Ökologie, Universität zu Köln, Köln, Germany.
Cluster of Excellence on Plant Sciences (CEPLAS), University of Cologne, Cologne, Germany.
Global Centre for Land-Based Innovation, Western Sydney University, Penrith, NSW, Australia.


Despite their importance, how plant communities and soil microorganisms interact to determine the capacity of ecosystems to provide multiple functions simultaneously (multifunctionality) under climate change is poorly known. We conducted a common garden experiment using grassland species to evaluate how plant functional structure and soil microbial (bacteria and protists) diversity and abundance regulate soil multifunctionality responses to joint changes in plant species richness (one, three and six species) and simulated climate change (3°C warming and 35% rainfall reduction). The effects of species richness and climate on soil multifunctionality were indirectly driven via changes in plant functional structure and their relationships with the abundance and diversity of soil bacteria and protists. More specifically, warming selected for the larger and most productive plant species, increasing the average size within communities and leading to reductions in functional plant diversity. These changes increased the total abundance of bacteria that, in turn, increased that of protists, ultimately promoting soil multifunctionality. Our work suggests that cascading effects between plant functional traits and the abundance of multitrophic soil organisms largely regulate the response of soil multifunctionality to simulated climate change, and ultimately provides novel experimental insights into the mechanisms underlying the effects of biodiversity and climate change on ecosystem functioning.


bacteria; biodiversity; climate change; ecosystem functioning; environmental filtering; nutrient cycles; protist; species richness

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