Abstract
Soil carbon dioxide efflux was measured in hummock and hollow niicrohabitals of a subarctic peat bog near Fairbanks, Alaska, during the 1983 growing season. Regardless of the presence of permafrost, hummocks showed a late June or early July peak in soil respiration followed by a gradual decrease. Hollows and wet Carex Lawns showed a gradual increase in soil respiration with no mid‐season peaks. Regression equations using soil temperature and soil moisture as independent variables explained 76% of the variance associated with soil carbon dioxide efflux. Sucrose (100 g m−2) applied to a field plot caused a significant increase in soil respiration but nitrogen (5 g m−2) did not. Sequential effects of nitrogen and phosphorus on peat respiration were demonstrated in a laboratory experiment.
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