Arbuscular Mycorrhizal Fungi May Mitigate the Influence of a Joint Rise of Temperature and Atmospheric CO 2 on Soil Respiration in Grasslands
2009
Vicca, S. | Zavalloni, C. | Fu, Y. S. H. | Voets, L. | Dupré de Boulois, Hervé | Declerck, S. | Ceulemans, R. | Nijs, I. | Janssens, I. A.
We investigated the effects of mycorrhizal colonization and future climate on roots and soil respiration (R soil) in model grassland ecosystems. We exposed artificial grassland communities on pasteurized soil (no living arbuscular mycorrhizal fungi (AMF) present) and on pasteurized soil subsequently inoculated with AMF to ambient conditions and to a combination of elevated CO 2 and temperature (future climate scenario). After one growing season, the inoculated soil revealed a positive climate effect on AMF root colonization and this elicited a significant AMF x climate scenario interaction on root biomass. Whereas the future climate scenario tended to increase root biomass in the noninoculated soil, the inoculated soil revealed a 30% reduction of root biomass under warming at elevated CO 2 (albeit not significant). This resulted in a diminished response of R soil to simulated climatic change, suggesting that AMF may contribute to an attenuated stimulation of R soil in a warmer, high CO 2 world.
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