Coupling Between and Among Ammonia Oxidizers and Nitrite Oxidizers in Grassland Mesocosms Submitted to Elevated CO<inf>2</inf> and Nitrogen Supply

Marie Simonin, Xavier Le Roux, Franck Poly, Catherine Lerondelle, Bruce A Hungate, Naoise Nunan, Audrey Niboyet

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Many studies have assessed the responses of soil microbial functional groups to increases in atmospheric CO<inf>2</inf> or N deposition alone and more rarely in combination. However, the effects of elevated CO<inf>2</inf> and N on the (de)coupling between different microbial functional groups (e.g., different groups of nitrifiers) have been barely studied, despite potential consequences for ecosystem functioning. Here, we investigated the short-term combined effects of elevated CO<inf>2</inf> and N supply on the abundances of the four main microbial groups involved in soil nitrification: ammonia-oxidizing archaea (AOA), ammonia-oxidizing bacteria (AOB), and nitrite-oxidizing bacteria (belonging to the genera Nitrobacter and Nitrospira) in grassland mesocosms. AOB and AOA abundances responded differently to the treatments: N addition increased AOB abundance, but did not alter AOA abundance. Nitrobacter and Nitrospira abundances also showed contrasted responses to the treatments: N addition increased Nitrobacter abundance, but decreased Nitrospira abundance. Our results support the idea of a niche differentiation between AOB and AOA, and between Nitrobacter and Nitrospira. AOB and Nitrobacter were both promoted at high N and C conditions (and low soil water content for Nitrobacter), while AOA and Nitrospira were favored at low N and C conditions (and high soil water content for Nitrospira). In addition, Nitrobacter abundance was positively correlated to AOB abundance and Nitrospira abundance to AOA abundance. Our results suggest that the couplings between ammonia and nitrite oxidizers are influenced by soil N availability. Multiple environmental changes may thus elicit rapid and contrasted responses between and among the soil ammonia and nitrite oxidizers due to their different ecological requirements.

Original languageEnglish (US)
Pages (from-to)809-818
Number of pages10
JournalMicrobial Ecology
Volume70
Issue number3
DOIs
StatePublished - Oct 1 2015

Fingerprint

oxidants
nitrites
nitrite
ammonia
Nitrobacter
grasslands
grassland
nitrogen
Archaea
bacterium
bacteria
functional group
soil water content
soil
soil water
water content
nitrification
niche
environmental change
niches

Keywords

  • Ammonia oxidizers
  • Global change
  • Grasslands
  • Niche differentiation
  • Nitrification
  • Nitrite oxidizers

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Soil Science

Cite this

Coupling Between and Among Ammonia Oxidizers and Nitrite Oxidizers in Grassland Mesocosms Submitted to Elevated CO<inf>2</inf> and Nitrogen Supply. / Simonin, Marie; Le Roux, Xavier; Poly, Franck; Lerondelle, Catherine; Hungate, Bruce A; Nunan, Naoise; Niboyet, Audrey.

In: Microbial Ecology, Vol. 70, No. 3, 01.10.2015, p. 809-818.

Research output: Contribution to journalArticle

Simonin, Marie ; Le Roux, Xavier ; Poly, Franck ; Lerondelle, Catherine ; Hungate, Bruce A ; Nunan, Naoise ; Niboyet, Audrey. / Coupling Between and Among Ammonia Oxidizers and Nitrite Oxidizers in Grassland Mesocosms Submitted to Elevated CO<inf>2</inf> and Nitrogen Supply. In: Microbial Ecology. 2015 ; Vol. 70, No. 3. pp. 809-818.
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