More new carbon in the mineral soil of a poplar plantation under Free Air Carbon Erichment (POPFACE): Cause of increased priming effect?

M.R. Hoosbeek, M. Lukac, D. Dam, D. Godbold, E.J. Velthorst, F.A. Bondi, A. Peressotti, M.F. Cotrufo, P. de Angelis, G. Scarascia-Mugnozza

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

[1] 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 (C-total) and incorporation of litter derived C (C-new) into soil organic matter (SOM) in a fast growing poplar plantation. C-new was estimated by the C3/C4 stable isotope method. C-total contents increased under control and FACE respectively by 12 and 3%, i.e., 484 and 107 gC/m(2), while 704 and 926 gC/m(2) of new carbon was sequestered under control and FACE during the experiment. We conclude that FACE suppressed the increase of C-total and simultaneously increased C-new. 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.
Original languageEnglish
Number of pages7
JournalGlobal Biogeochemical Cycles
Volume18
Issue number1
DOIs
Publication statusPublished - 2004

Keywords

  • elevated atmospheric co2
  • organic-matter
  • terrestrial ecosystems
  • turnover
  • forest
  • storage
  • system
  • decomposition
  • mechanisms
  • feedbacks

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