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Contrasted effects of increased N and CO2 supply on two keystone species in peatland restoration and implications for global change
- Mitchell, E. A. D (author)
- Buttler, A (author)
- Grosvernier, P (author)
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- Siegenthaler, A. (author)
- Gobat, J.-M. (author)
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- (creator_code:org_t)
- 2002-05-19
- 2002
- English.
- In: Journal of Ecology. - : Wiley. - 0022-0477 .- 1365-2745. ; 90:3, s. 529-533
- Journal article (peer-reviewed)
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- 1 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.2 The potential effects of bog regeneration will, however, depend on the successful establishment of the principal peat formers –Sphagnum mosses. The influence of hydrology and microclimate on Sphagnum re-growth is well studied but effects of elevated CO2 and N deposition are not known.3 We carried out two in-situ experiments in a cutover bog during three growing seasons in which we raised either CO2 (to 560 p.p.m.) or N (by adding NH4NO3, 3 g m−2 year−1). The two treatments had contrasting effects on competition between the initial coloniser Polytrichum strictum (favoured by high N) and the later coloniser Sphagnum fallax (favoured by high CO2).4 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.
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