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Raised atmospheric CO<sub>2</sub> levels and increased N deposition cause shifts in plant species composition and production in <i>Sphagnum</i> bogs
Auteur(s)
Berendse, Frank
van Breemen, Nico
Rydin, HÅkan
Buttler, Alexandre
Heijmans, Monique
Hoosbeek, Marcel R.
Lee, John A.
Saarinen, Timo
Vasander, Harri
Wallén, Bo
Date de parution
2001
In
Global Change Biology, Wiley, 2001/7/5/591-598
Résumé
Part of the missing sink in the global CO<sub>2</sub> budget has been attributed to the positive effects of CO<sub>2</sub> fertilization and N deposition on carbon sequestration in Northern Hemisphere terrestrial ecosystems. The genus Sphagnum is one of the most important groups of plant species sequestrating carbon in temperate and northern bog ecosystems, because of the low decomposability of the dead material it produces. The effects of raised CO<sub>2</sub> and increased atmospheric N deposition on growth of <i>Sphagnum</i> and other plants were studied in bogs at four sites across Western Europe. Contrary to expectations, elevated CO<sub>2</sub> did not significantly affect <i>Sphagnum</i> biomass growth. Increased N deposition reduced <i>Sphagnum</i> mass growth, because it increased the cover of vascular plants and the tall moss <i>Polytrichum strictum</i>. Such changes in plant species composition may decrease carbon sequestration in <i>Sphagnum</i>-dominated bog ecosystems.
Identifiants
Type de publication
journal article
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