Notice of RetractionEffects of Elevated CO2 Concentration on Plant-Soil System Carbon Fixation in Freshwater Marsh Sanjiang Plain, Northeast China

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

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An experiment was carried out with treatments differing in nitrogen supply (0, 5 and 15 gN/m²) and CO₂ level (350 and 700 μmol/mol) using OTC (open top chamber) equipment to investigate the plant-soil carbon fixation in freshwater marsh Sanjiang Plian after two years. Results showed that elevated atmosphere CO₂ concentration increased plant biomass and the response of biomass to enhanced CO₂ concentration differed in N levels. Both the increase of aboveground biomass and belowground biomass were greater under high level of N supply (15 gN/m²). Elevated CO₂ concentration increased the amount of plant carbon fixation and the increase was 19.3%, 24.4% and 24.6% with NN, MN, and HN respectively. Elevated CO₂ concentration also increased the allocation of biomass and carbon in belowground parts. The variations in soil organic carbon was not significant and merely increased 0.5-1.8% under nitrogen addition.