Predicting the Responses of Soil Nitrite-Oxidizers to Multi-Factorial Global Change: A Trait-Based Approach

Xavier Le Roux, Nicholas J. Bouskill, Audrey Niboyet, Laure Barthes, Paul Dijkstra, Chris B. Field, Bruce A. Hungate, Catherine Lerondelle, Thomas Pommier, Jinyun Tang, Akihiko Terada, Maria Tourna, Franck Poly

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Abstract

Soil microbial diversity is huge and a few grams of soil contain more bacterial taxa than there are bird species on Earth. This high diversity often makes predicting the responses of soil bacteria to environmental change intractable and restricts our capacity to predict the responses of soil functions to global change. Here, using a long-term field experiment in a California grassland, we studied the main and interactive effects of three global change factors (increased atmospheric CO2 concentration, precipitation and nitrogen addition, and all their factorial combinations, based on global change scenarios for central California) on the potential activity, abundance and dominant taxa of soil nitrite-oxidizing bacteria (NOB). Using a trait-based model, we then tested whether categorizing NOB into a few functional groups unified by physiological traits enables understanding and predicting how soil NOB respond to global environmental change. Contrasted responses to global change treatments were observed between three main NOB functional types. In particular, putatively mixotrophic Nitrobacter, rare under most treatments, became dominant under the 'High CO2+Nitrogen+Precipitation' treatment. The mechanistic trait-based model, which simulated ecological niches of NOB types consistent with previous ecophysiological reports, helped predicting the observed effects of global change on NOB and elucidating the underlying biotic and abiotic controls. Our results are a starting point for representing the overwhelming diversity of soil bacteria by a few functional types that can be incorporated into models of terrestrial ecosystems and biogeochemical processes.
Original languageEnglish
Article number628
JournalFrontiers in Microbiology
Volume7
Number of pages13
ISSN1664-302X
DOIs
Publication statusPublished - 2016

Keywords

  • MICROBIOLOGY
  • WATER TREATMENT PLANTS
  • GRASSLAND RESPONSES
  • NITRIFYING BACTERIA
  • MICROBIAL DIVERSITY
  • COMMUNITY STRUCTURE
  • AMMONIA-OXIDIZERS
  • ELEVATED CO2
  • NITROSPIRA
  • NITROBACTER
  • BIOGEOGRAPHY
  • bacterial functional traits
  • elevated CO2
  • nitrifiers
  • nitrogen fertilisation
  • trait-based modeling

Cite this

Le Roux, X., Bouskill, N. J., Niboyet, A., Barthes, L., Dijkstra, P., Field, C. B., Hungate, B. A., Lerondelle, C., Pommier, T., Tang, J., Terada, A., Tourna, M., & Poly, F. (2016). Predicting the Responses of Soil Nitrite-Oxidizers to Multi-Factorial Global Change: A Trait-Based Approach. Frontiers in Microbiology, 7, [628]. https://doi.org/10.3389/fmicb.2016.00628