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

Enrique Valencia*, Nicolas Gross, José L. Quero, Carlos P. Carmona, Victoria Ochoa, Beatriz Gozalo, Manuel Delgado-Baquerizo, Kenneth Dumack, Kelly Hamonts, Brajesh K. Singh, Michael Bonkowski, Fernando T. Maestre

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

100 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)5642-5654
Number of pages13
JournalGlobal change biology
Volume24
Issue number12
DOIs
StatePublished - Dec 2018

Keywords

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

ASJC Scopus subject areas

  • Global and Planetary Change
  • Environmental Chemistry
  • Ecology
  • General Environmental Science

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