Journal Article

PreJuSER-10926

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png 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. ; Dufrene, E. ; Jarvis, P. G. ; Kasurinen, A. ; Kellomäki, S. ; Le Dantec, V. ; Liberloo, M. ; Marek, M. ; Medlyn, B. ; Pokorny, R. ; Scarascia-Mugnozza, G. ; Temperton, V. M.FZJ* ; Tingey, D. ; Urban, O. ; Ceulemans, R. ; Janssens, I. A.

2010
Wiley-Blackwell Oxford [u.a.]

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Please use a persistent id in citations: doi:10.1111/j.1365-3040.2010.02201.x

Abstract: Under elevated atmospheric CO(2) 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 CO(2) 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 CO(2) 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 CO(2) 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 CO(2). Soil N concentration strongly interacted with CO(2) fumigation: the effect of elevated CO(2) 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 CO(2) are modulated by N availability, and that it is essential to account for soil N concentration in C cycling analyses.

Keyword(s): Atmosphere (MeSH) ; Biomass (MeSH) ; Carbon Cycle (MeSH) ; Carbon Dioxide (MeSH) ; Fertilizers (MeSH) ; Nitrogen Cycle (MeSH) ; Soil: analysis (MeSH) ; Trees: growth & development (MeSH) ; Fertilizers ; Soil ; Carbon Dioxide ; J ; [CO2] enrichment (auto) ; C sequestration (auto) ; fine root production (auto) ; microbial respiration (auto) ; N fertilization (auto) ; root biomass (auto)

Note: We thank L. E. Henry and K. Pregitzer for providing data, as well as C. Korner for useful information about their experimental sites. Special thanks go to the researchers of the ECOCRAFT [Framework programmes of the EC (EC contracts within 5FP and 6FP, Environment and Research)] and the EUROFACE projects, who provided the large number of data that formed the foundation for this paper. M. L. is a postdoctoral research associate of the Flemish Science Foundation FWO (Fonds Wetenschappelijk onderzoek, FWO Vlaanderen). I.J. holds an FWO research grant, and S. L. holds a European Research Council (ERC) grant. Part of this research has been funded through the UA-Research Centre of Excellence ECO.

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Research Program(s):

1. Terrestrische Umwelt (P24)

Appears in the scientific report 2010
Notes: Nachtrag

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