Exposure to warming and CO 2 enrichment promotes greater above-ground biomass, nitrogen, phosphorus and arbuscular mycorrhizal colonization in newly established grasslands

Zavalloni, Costanza;Vicca, Sara;Büscher, Manu;De La Providencia Sanchez, Ivan Enriquez;Ceulemans, Reinhart;et.al.
(2012) Plant and Soil : international journal on plant-soil relationships — Vol. 359, n° 1-2, p. 121-136 (2012)

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Authors
  • Zavalloni, CostanzaUniversity of Antwerp
    Author
  • Vicca, SaraUniversity of Antwerp
    Author
  • Büscher, ManuUniversity of Antwerp
    Author
  • De La Providencia Sanchez, Ivan EnriquezUCLouvain
    Author
  • Dupré de Boulois, HervéUCLouvain
    Author
  • Declerck, StephanUCLouvain
    Author
  • Ceulemans, ReinhartUniversity of Antwerp
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Abstract
Aims: In view of the projected increase in global air temperature and CO <inf>2</inf> concentration, the effects of climatic changes on biomass production, CO <inf>2</inf> fluxes and arbuscular mycorrhizal fungi (AMF) colonization in newly established grassland communities were investigated. We hypothesized that above- and below-ground biomass, gross primary productivity (GPP), AMF root colonization and nutrient acquisition would increase in response to the future climate conditions. Furthermore, we expected that increased below-ground C allocation would enhance soil respiration (R <inf>soil</inf>). Methods: Grassland communities were grown either at ambient temperatures with 375 ppm CO <inf>2</inf> (Amb) or at ambient temperatures +3°C with 620 ppm CO <inf>2</inf> (T+CO <inf>2</inf>). Results: Total biomass production and GPP were stimulated under T+CO <inf>2</inf>. Above-ground biomass was increased under T+CO <inf>2</inf> while belowground biomass was similar under both climates. The significant increase in root colonization intensity under T+CO <inf>2</inf>, and therefore the better contact between roots and AMF, probably determined the higher above-ground P and N content. R <inf>soil</inf> was not significantly affected by the future climate conditions, only showing a tendency to increase under future climate at the end of the season. Conclusions: Newly established grasslands benefited from the exposure to elevated CO <inf>2</inf> and temperature in terms of total biomass production; higher root AMF colonization may partly provide the nutrients required to sustain this growth response. © 2012 Springer Science+Business Media B.V.
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Zavalloni, C., Vicca, S., Büscher, M., De La Providencia Sanchez, I. E., Dupré de Boulois, H., Declerck, S., Nijs, I., & Ceulemans, R. (2012). Exposure to warming and CO 2 enrichment promotes greater above-ground biomass, nitrogen, phosphorus and arbuscular mycorrhizal colonization in newly established grasslands. Plant and Soil : international journal on plant-soil relationships, 359(1-2), 121-136. https://doi.org/10.1007/s11104-012-1190-y (Original work published 2012)