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Rezultaty
Summary:
Preliminary analyses showed no significant elevated CO2 treatment effect on the growth of Sphagnum, except for the Dutch site where Sphagnum length growth increased. No significant treatment effects on the above ground biomass of vascular plants were found. All data will be analyzed in more detail with the use of co-variables like water level and species composition.
There are indications of interaction between peat mosses and vascular plants as a result of elevated CO2 and N treatments at the NL site. Sphagnum length growth was 33% higher under elevated CO2. Elevated CO2 also stimulated growth of most vascular plant species, but not growth of the species Vaccinium oxycoccus and Drosera rotundifolia which are growing close to the moss surface. Drosera almost disappeared from the elevated CO2 plots, as a consequence of the high Sphagnum length growth.
Above ground vascular plant biomass at final harvest was higher under elevated N at the Dutch site. During the third growing season Sphagnum length growth was significantly reduced under elevated N due to increased shading by vascular plants.
CH4 emissions increased under elevated CO2 treatment with 4,15,20 and 33% in SE, FIN, CH and NL respectively.
FIN and SE sites showed higher CH4 emissions under elevated N, while at other sites lower emissions were observed. Further analyses will include environmental factors like water table and temperature.
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