Testing interactive effects of global environmental changes on soil nitrogen cycling

A. Niboyet, X. Le Roux, Paul Dijkstra, Bruce A Hungate, L. Barthes, J. C. Blankinship, J. R. Brown, C. B. Field, P. W. Leadley

Research output: Contribution to journalArticle

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Abstract

Responses of soil nitrogen (N) cycling to simultaneous and potentially interacting global environmental changes are uncertain. Here, we investigated the combined effects of elevated CO2, warming, increased precipitation and enhanced N supply on soil N cycling in an annual grassland ecosystem as part of the Jasper Ridge Global Change Experiment (CA, USA). This field experiment included four treatments-CO2, temperature, precipitation, nitrogen-with two levels per treatment (ambient and elevated), and all their factorial combinations replicated six times. We collected soil samples after 7 and 8 years of treatments, and measured gross rates of N mineralization, N immobilization and nitrification, along with potential rates of ammonia oxidation, nitrite oxidation and denitrification. We also determined the main drivers of these microbial activities (soil ammonium and nitrate concentrations, soil moisture, soil temperature, soil pH, and soil CO 2 efflux, as an indicator of soil heterotrophic activity). We found that gross N mineralization responded to the interactive effects of the CO 2, precipitation and N treatments: N addition increased gross N mineralization when CO2 and precipitation were either both at ambient or both at elevated levels. However, we found limited evidence for interactions among elevated CO2, warming, increased precipitation, and enhanced N supply on the other N cycling processes examined: statistically significant interactions, when found, tended not to persist across multiple dates. Soil N cycling responded mainly to single-factor effects: long-term N addition increased gross N immobilization, potential ammonia oxidation and potential denitrification, while increased precipitation depressed potential nitrite oxidation and increased potential ammonia oxidation and potential denitrification. In contrast, elevated CO2 and modest warming did not significantly affect any of these microbial N transformations. These findings suggest that global change effects on soil N cycling are primarily additive, and therefore generally predictable from single factor studies. Copyright:

Original languageEnglish (US)
Article number56
JournalEcosphere
Volume2
Issue number5
DOIs
StatePublished - May 23 2011

Fingerprint

soil nitrogen
global change
environmental change
nitrogen
oxidation
soil
denitrification
testing
mineralization
ammonia
warming
nitrites
immobilization
nitrite
annual grasslands
effect
nitrification
microbial activity
soil temperature
soil pH

Keywords

  • Ammonia oxidation
  • Denitrification
  • Enhanced N supply
  • Grasslands
  • Increased precipitation
  • Interactions
  • N immobilization
  • N mineralization
  • Nitrification
  • Nitrite oxidation
  • Warming

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology

Cite this

Testing interactive effects of global environmental changes on soil nitrogen cycling. / Niboyet, A.; Le Roux, X.; Dijkstra, Paul; Hungate, Bruce A; Barthes, L.; Blankinship, J. C.; Brown, J. R.; Field, C. B.; Leadley, P. W.

In: Ecosphere, Vol. 2, No. 5, 56, 23.05.2011.

Research output: Contribution to journalArticle

Niboyet, A, Le Roux, X, Dijkstra, P, Hungate, BA, Barthes, L, Blankinship, JC, Brown, JR, Field, CB & Leadley, PW 2011, 'Testing interactive effects of global environmental changes on soil nitrogen cycling', Ecosphere, vol. 2, no. 5, 56. https://doi.org/10.1890/ES10-00148.1
Niboyet, A. ; Le Roux, X. ; Dijkstra, Paul ; Hungate, Bruce A ; Barthes, L. ; Blankinship, J. C. ; Brown, J. R. ; Field, C. B. ; Leadley, P. W. / Testing interactive effects of global environmental changes on soil nitrogen cycling. In: Ecosphere. 2011 ; Vol. 2, No. 5.
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AU - Le Roux, X.

AU - Dijkstra, Paul

AU - Hungate, Bruce A

AU - Barthes, L.

AU - Blankinship, J. C.

AU - Brown, J. R.

AU - Field, C. B.

AU - Leadley, P. W.

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N2 - Responses of soil nitrogen (N) cycling to simultaneous and potentially interacting global environmental changes are uncertain. Here, we investigated the combined effects of elevated CO2, warming, increased precipitation and enhanced N supply on soil N cycling in an annual grassland ecosystem as part of the Jasper Ridge Global Change Experiment (CA, USA). This field experiment included four treatments-CO2, temperature, precipitation, nitrogen-with two levels per treatment (ambient and elevated), and all their factorial combinations replicated six times. We collected soil samples after 7 and 8 years of treatments, and measured gross rates of N mineralization, N immobilization and nitrification, along with potential rates of ammonia oxidation, nitrite oxidation and denitrification. We also determined the main drivers of these microbial activities (soil ammonium and nitrate concentrations, soil moisture, soil temperature, soil pH, and soil CO 2 efflux, as an indicator of soil heterotrophic activity). We found that gross N mineralization responded to the interactive effects of the CO 2, precipitation and N treatments: N addition increased gross N mineralization when CO2 and precipitation were either both at ambient or both at elevated levels. However, we found limited evidence for interactions among elevated CO2, warming, increased precipitation, and enhanced N supply on the other N cycling processes examined: statistically significant interactions, when found, tended not to persist across multiple dates. Soil N cycling responded mainly to single-factor effects: long-term N addition increased gross N immobilization, potential ammonia oxidation and potential denitrification, while increased precipitation depressed potential nitrite oxidation and increased potential ammonia oxidation and potential denitrification. In contrast, elevated CO2 and modest warming did not significantly affect any of these microbial N transformations. These findings suggest that global change effects on soil N cycling are primarily additive, and therefore generally predictable from single factor studies. Copyright:

AB - Responses of soil nitrogen (N) cycling to simultaneous and potentially interacting global environmental changes are uncertain. Here, we investigated the combined effects of elevated CO2, warming, increased precipitation and enhanced N supply on soil N cycling in an annual grassland ecosystem as part of the Jasper Ridge Global Change Experiment (CA, USA). This field experiment included four treatments-CO2, temperature, precipitation, nitrogen-with two levels per treatment (ambient and elevated), and all their factorial combinations replicated six times. We collected soil samples after 7 and 8 years of treatments, and measured gross rates of N mineralization, N immobilization and nitrification, along with potential rates of ammonia oxidation, nitrite oxidation and denitrification. We also determined the main drivers of these microbial activities (soil ammonium and nitrate concentrations, soil moisture, soil temperature, soil pH, and soil CO 2 efflux, as an indicator of soil heterotrophic activity). We found that gross N mineralization responded to the interactive effects of the CO 2, precipitation and N treatments: N addition increased gross N mineralization when CO2 and precipitation were either both at ambient or both at elevated levels. However, we found limited evidence for interactions among elevated CO2, warming, increased precipitation, and enhanced N supply on the other N cycling processes examined: statistically significant interactions, when found, tended not to persist across multiple dates. Soil N cycling responded mainly to single-factor effects: long-term N addition increased gross N immobilization, potential ammonia oxidation and potential denitrification, while increased precipitation depressed potential nitrite oxidation and increased potential ammonia oxidation and potential denitrification. In contrast, elevated CO2 and modest warming did not significantly affect any of these microbial N transformations. These findings suggest that global change effects on soil N cycling are primarily additive, and therefore generally predictable from single factor studies. Copyright:

KW - Ammonia oxidation

KW - Denitrification

KW - Enhanced N supply

KW - Grasslands

KW - Increased precipitation

KW - Interactions

KW - N immobilization

KW - N mineralization

KW - Nitrification

KW - Nitrite oxidation

KW - Warming

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