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

Journal Article · · Frontiers in Microbiology
 [1];  [2];  [3];  [4];  [5];  [6];  [5];  [1];  [1];  [2];  [7];  [8];  [1]
  1. Univ. of Lyon, Villeurbanne (France)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Earth Sciences Division
  3. Univ. of Paris-Sud, Orsay (France); Univ. Pierre et Marie Curie, Thiverval Grignon (France)
  4. Univ. of Paris-Sud, Orsay (France)
  5. Northern Arizona Univ., Flagstaff, AZ (United States). Ecosystem Science and Society Center
  6. Stanford Univ., CA (United States). Dept. of Global Ecology
  7. Technical Univ. of Denmark, Kongens Lyngby (Denmark); Tokyo Univ. of Agriculture and Technology, Tokyo (Japan)
  8. Univ. of Lyon, Villeurbanne (France); Univ. of Thessaly, Larisa (Greece)

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 CO 2 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 CO 2 +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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1378980
Journal Information:
Frontiers in Microbiology, Vol. 7, Issue MAY; ISSN 1664-302X
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 46 works
Citation information provided by
Web of Science

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Cited By (8)

Toxicity of TiO 2 nanoparticles on soil nitrification at environmentally relevant concentrations: Lack of classical dose–response relationships journal February 2017
Biological inhibition of soil nitrification by forest tree species affects Nitrobacter populations journal August 2019
Evidence for Microbial Mediated NO3− Cycling Within Floodplain Sediments During Groundwater Fluctuations journal July 2019
Nutrient and Rainfall Additions Shift Phylogenetically Estimated Traits of Soil Microbial Communities journal July 2017
Controls and Adaptive Management of Nitrification in Agricultural Soils journal August 2019
SUPECA kinetics for scaling redox reactions in networks of mixed substrates and consumers and an example application to aerobic soil respiration journal January 2017
Adaptation of soil nitrifiers to very low nitrogen level jeopardizes the efficiency of chemical fertilization in west african moist savannas journal August 2017
Geospatial variation in co‐occurrence networks of nitrifying microbial guilds journal November 2018