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

Dieleman, W.I.J., Luyssaert, S., Rey, A., De Angelis, P., Barton, C.V.M., Broadmeadow, M.S.J., Broadmeadow, S.B., Chigwerewe, K.S., Crookshanks, M., Dufrêne, E., Jarvis, P.G., Kasurinen, A., Kellomäki, S., Le Dantec, V., Liberloo, M., Marek, M., Medlyn, B., Pokorný, R., Scarascia-Mugnozza, G., Temperton, V.M., Tingey, D., Urban, O., Ceulemans, R., and Janssens, I.A. (2010) Soil [N] modulates soil C cycling in CO2-fumigated tree stands: a meta-analysis. Plant, Cell & Environment, 33 (12). pp. 2001-2011.

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Abstract

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.

Item ID: 19961
Item Type: Article (Refereed Research - C1)
ISSN: 1365-3040
Funders: University of Antwerp Research Centre of Excellence ECO
Date Deposited: 05 Jun 2012 02:54
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050204 Environmental Impact Assessment @ 100%
SEO Codes: 96 ENVIRONMENT > 9603 Climate and Climate Change > 960310 Global Effects of Climate Change and Variability (excl. Australia, New Zealand, Antarctica and the South Pacific) @ 100%
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