Biogeochemistry

, Volume 109, Issue 1–3, pp 85–100

Effects of multiple global change treatments on soil N2O fluxes

  • Jamie R. Brown
  • Joseph C. Blankinship
  • Audrey Niboyet
  • Kees Jan van Groenigen
  • Paul Dijkstra
  • Xavier Le Roux
  • Paul W. Leadley
  • Bruce A. Hungate
Article

DOI: 10.1007/s10533-011-9655-2

Cite this article as:
Brown, J.R., Blankinship, J.C., Niboyet, A. et al. Biogeochemistry (2012) 109: 85. doi:10.1007/s10533-011-9655-2

Abstract

Global environmental changes are expected to alter ecosystem carbon and nitrogen cycling, but the interactive effects of multiple simultaneous environmental changes are poorly understood. Effects of these changes on the production of nitrous oxide (N2O), an important greenhouse gas, could accelerate climate change. We assessed the responses of soil N2O fluxes to elevated CO2, heat, altered precipitation, and enhanced nitrogen deposition, as well as their interactions, in an annual grassland at the Jasper Ridge Global Change Experiment (CA, USA). Measurements were conducted after 6, 7 and 8 years of treatments. Elevated precipitation increased N2O efflux, especially in combination with added nitrogen and heat. Path analysis supported the idea that increased denitrification due to increased soil water content and higher labile carbon availability best explained increased N2O efflux, with a smaller, indirect contribution from nitrification. In our data and across the literature, single-factor responses tended to overestimate interactive responses, except when global change was combined with disturbance by fire, in which case interactive effects were large. Thus, for chronic global environmental changes, higher order interactions dampened responses of N2O efflux to multiple global environmental changes, but interactions were strongly positive when global change was combined with disturbance. Testing whether these responses are general should be a high priority for future research.

Keywords

Interactions Global environmental change Elevated CO2 Warming Precipitation Nitrogen deposition Soil Grassland FACE Nitrification Denitrification Meta-analysis 

Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Jamie R. Brown
    • 1
  • Joseph C. Blankinship
    • 1
    • 2
  • Audrey Niboyet
    • 3
    • 4
  • Kees Jan van Groenigen
    • 1
  • Paul Dijkstra
    • 1
  • Xavier Le Roux
    • 5
  • Paul W. Leadley
    • 6
  • Bruce A. Hungate
    • 1
  1. 1.Department of Biological Sciences and Merriam-Powell Center for Environmental ResearchNorthern Arizona UniversityFlagstaffUSA
  2. 2.School of Natural Sciences and Sierra Nevada Research InstituteUniversity of CaliforniaMercedUSA
  3. 3.Laboratoire Ecologie, Systématique et EvolutionUMR 8079 Université Paris-Sud 11/CNRS/AgroParisTechOrsayFrance
  4. 4.Laboratoire Biogéochimie et Ecologie des Milieux Continentaux, AgroParisTechUMR 7618 Université Pierre et Marie Curie/CNRS/AgroParisTechThiverval GrignonFrance
  5. 5.Laboratoire d’Ecologie MicrobienneUniversité de LyonVilleurbanneFrance
  6. 6.Laboratoire Ecologie, Systématique et EvolutionUniversité Paris-Sud, UMR 8079 Université Paris-Sud/CNRS/AgroParisTechOrsayFrance

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