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Contrasted effects of increased N and CO<sub>2</sub> supply on two keystone species in peatland restoration and implications for global change
Auteur(s)
Buttler, Alexandre
Grosvernier, Philippe
Rydin, HÅkan
Siegenthaler, Andy
Date de parution
2002
In
Journal of Ecology, Wiley, 2002/90/3/529-533
Résumé
<b>1</b> Significant areas of temperate bogs have been damaged by peat harvesting but may regenerate. These secondary mires, if well managed, may act as strong C sinks, regulate hydrology and buffer regional climate. <br> <b>2</b> The potential effects of bog regeneration will, however, depend on the successful establishment of the principal peat formers –<i>Sphagnum</i> mosses. The influence of hydrology and microclimate on <i>Sphagnum</i> re-growth is well studied but effects of elevated CO2 and N deposition are not known. <br> <b>3</b> We carried out two <i>in-situ</i> experiments in a cutover bog during three growing seasons in which we raised either CO<sub>2</sub> (to 560 p.p.m.) or N (by adding NH<sub>4</sub>NO<sub>3</sub>, 3 g m<sup>−2</sup> year<sup>−1</sup>). The two treatments had contrasting effects on competition between the initial coloniser <i>Polytrichum strictum</i> (favoured by high N) and the later coloniser <i>Sphagnum fallax</i> (favoured by high CO<sub>2</sub>). <br> <b>4</b> Such changes may have important consequences for bog regeneration and hence for carbon sequestration in cutover bogs, with potential feedback on regional hydrological and climatic processes.
Identifiants
Type de publication
journal article
