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Hoosbeek et al. 2004
Hoosbeek, M.R., Lukac, M., van Dam, D., Godbold, D.L., Velthorst, E.J., Biondi, F.A., Peressotti, A., Cotrufo, M.F., de Angelis, P. and Scarascia-Mugnozza, G. (2004). More new carbon in the mineral soil of a poplar plantation under Free Air Carbon Enrichment (POPFACE): Cause of increased priming effect?. Global Biogeochemical Cycles 18: doi: 10.1029/2003GB002127. issn: 0886-6236.

In order to establish suitability of forest ecosystems for long-term storage of C, it is necessary to characterize the effects of predicted increased atmospheric CO2 levels on the pools and fluxes of C within these systems. Since most C held in terrestrial ecosystems is in the soil, we assessed the influence of Free Air Carbon Enrichment (FACE) treatment on the total soil C content (Ctotal) and incorporation of litter derived C (Cnew) into soil organic matter (SOM) in a fast growing poplar plantation. Cnew was estimated by the C3/C4 stable isotope method. Ctotal contents increased under control and FACE respectively by 12 and 3%, i.e., 484 and 107 gC/m2, while 704 and 926 gC/m2 of new carbon was sequestered under control and FACE during the experiment. We conclude that FACE suppressed the increase of Ctotal and simultaneously increased Cnew. We hypothesize that these opposite effects may be caused by a priming effect of the newly incorporated litter, where priming effect is defined as the stimulation of SOM decomposition caused by the addition of labile substrates.

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Abstract

Keywords
Atmospheric Composition and Structure, Biosphere/atmosphere interactions, Atmospheric Composition and Structure, Constituent sources and sinks, Global Change, Biogeochemical processes, Oceanography, Biological and Chemical, Stable isotopes, C sequestration, FACE, soil carbon
Journal
Global Biogeochemical Cycles
http://www.agu.org/journals/gb/
Publisher
American Geophysical Union
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