Abstract
Sphagnum species, once dominant in the blanket bog vegetation of the southern Pennines, have largely disappeared since the Industrial Revolution. Laboratory studies suggest that the growth of a number of Sphagnum species is sensitive to sulphur pollutants ( − HSO 3, −− SO 4, SO 2) within the range of concentrations found in Great Britain today. The species differ in their response to the pollutants; 0·5 mM −HSO 3 eventually proved lethal to the most sensitive species but reduced the growth rate of the most resistant, S. recurvum, by only 35%. These results are discussed in relation to vegetation changes in the southern Pennines and north Cheshire.
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