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Plant and Soil

, Volume 420, Issue 1–2, pp 289–302 | Cite as

Elevated CO2 mediates the short-term drought recovery of ecosystem function in low-diversity grassland systems

  • Audrey Niboyet
  • Gérard Bardoux
  • Sebastien Barot
  • Juliette M. G. BloorEmail author
Regular Article

Abstract

Background and aims

Ecosystems are expected to experience simultaneous environmental changes. This study examines the interactive effects of atmospheric CO2 and plant community composition on grassland ecosystem functioning after a severe drought.

Methods

Monocultures of the grass Dactylis glomerata were compared to a four-species grassland community under ambient and elevated CO2, with or without drought. Greenhouse gas fluxes, C and N pools in plants and soil were measured over a 55-day, post-rewetting period for all mesocosms.

Results

Experimental drought reduced aboveground biomass production, but increased soil inorganic N and dissolved organic C (DOC) across CO2 and community composition treatments. Following rewetting, droughted mesocosms had lower ecosystem respiration and higher N2O emissions. After 55 days, negative drought effects persisted on above- and belowground C stocks and root N stocks. Elevated CO2 reduced the magnitude of drought effects on ecosystem respiration, N2O fluxes and plant C:N ratios but increased drought-induced changes to soil DOC. The four-species mixture buffered ecosystem respiration from drought effects, but showed higher drought-induced increases in soil inorganic N shortly after rewetting.

Conclusions

Elevated CO2 mitigates the effects of extreme drought on multiple grassland functions. In contrast, grassland composition appears to have mainly additive effects with drought and elevated CO2 in our simple sown systems.

Keywords

Climate change CO2 fluxes Extreme events Grassland production Nitrous oxide emissions Plant-soil interactions 

Notes

Acknowledgements

This study was supported by the ‘Agence Nationale de la Recherche’ (PULSE project ANR-2010-CEPL-010-04). The authors thank the CEREEP-Ecotron Ile De France (UMS 3194, CNRS-ENS, Foljuif experimental station) for providing soil, and are grateful to D. Sévéré and S. Fontaine for help setting up and monitoring the experiment. We thank L. Conte, M. Coornaert, W. Daniel, M. Guérin, S. Lireux, F. Marmonier, and S-L. Redon for assistance with data collection and harvests. Thanks also to Katja Klumpp for helpful comments on a previous version of the manuscript.

Supplementary material

11104_2017_3377_MOESM1_ESM.docx (821 kb)
ESM 1 (DOCX 820 kb)

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Audrey Niboyet
    • 1
  • Gérard Bardoux
    • 2
  • Sebastien Barot
    • 3
  • Juliette M. G. Bloor
    • 4
    Email author
  1. 1.Institute of Ecology and Environmental Sciences – Paris (IEES - Paris)UMR 7618 Université Pierre et Marie Curie / CNRS / AgroParisTech, AgroParisTechThiverval GrignonFrance
  2. 2.Institut de Physique du Globe de ParisParisFrance
  3. 3.IRDInstitute of Ecology and Environmental Sciences – Paris (IEES - Paris), UMR 7618 (CNRS, UPMC, INRA, IRD)ParisFrance
  4. 4.INRA, VetAgro-Sup, UREPClermont-FerrandFrance

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