Soil [N] modulates soil C cycling in CO2-fumigated tree stands: A meta-analysis

Publikation: Beiträge in ZeitschriftenZeitschriftenaufsätzeForschungbegutachtet


  • W. I.J. Dieleman
  • S. Luyssaert
  • A. Rey
  • P. De Angelis
  • C. V.M. Barton
  • M. S.J. Broadmeadow
  • S. B. Broadmeadow
  • K. S. Chigwerewe
  • M. Crookshanks
  • E. Dufrêne
  • P. G. Jarvis
  • A. Kasurinen
  • S. Kellomäki
  • V. Le Dantec
  • M. Liberloo
  • M. Marek
  • B. Medlyn
  • R. Pokornỳ
  • G. Scarascia-Mugnozza
  • D. Tingey
  • O. Urban
  • R. Ceulemans
  • I. A. Janssens

Under elevated atmospheric CO2 concentrations, soil carbon (C) inputs are typically enhanced, suggesting larger soil C sequestration potential. However, soil C losses also increase and progressive nitrogen (N) limitation to plant growth may reduce the CO2 effect on soil C inputs with time. We compiled a data set from 131 manipulation experiments, and used meta-analysis to test the hypotheses that: (1) elevated atmospheric CO2 stimulates soil C inputs more than C losses, resulting in increasing soil C stocks; and (2) that these responses are modulated by N. Our results confirm that elevated CO2 induces a C allocation shift towards below-ground biomass compartments. However, the increased soil C inputs were offset by increased heterotrophic respiration (Rh), such that soil C content was not affected by elevated CO2. Soil N concentration strongly interacted with CO2 fumigation: the effect of elevated CO2 on fine root biomass and -production and on microbial activity increased with increasing soil N concentration, while the effect on soil C content decreased with increasing soil N concentration. These results suggest that both plant growth and microbial activity responses to elevated CO2 are modulated by N availability, and that it is essential to account for soil N concentration in C cycling analyses.

ZeitschriftPlant, Cell and Environment
Seiten (von - bis)2001-2011
Anzahl der Seiten11
PublikationsstatusErschienen - 12.2010
Extern publiziertJa