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Hydrology and dissolved organic carbon biogeochemistry in an ombrotrophic bog

✍ Scribed by C. J. D. Fraser; N. T. Roulet; T. R. Moore

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
282 KB
Volume
15
Category
Article
ISSN
0885-6087

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✦ Synopsis

Abstract

At the Mer Bleue bog, Ontario, Canada, DOC export measured at the basin outflow was −8·3 ± 3·7 g C m^−2^ yr^−1^, and DOC loading via precipitation was estimated to be 1·5 ± 0·7 g C m^−2^ yr^−1^. Discharge and DOC export calculated using a Dupuit–Forchheimer approximation compared well (within 1 g C m^−2^ yr^−1^) to outflow estimates of DOC export, and confirmed that outflow measurements were a suitable proxy for DOC seepage at the peatland margins. DOC export was 12% of the magnitude of the residual carbon sink measured at the peatland. The [DOC] across groundwater transects decreased with depth, and [DOC] sampled below 0·75 m depths remained fairly constant over the study period. However, [DOC] exported through the acrotelm (0 to 0·45 m peat depth) was variable, ranging from 40 mg l^−1^ after snowmelt to 70 mg l^−1^ during the growing season. Fluorescence analysis revealed that exported DOC was ‘allochthonous‐like’, whereas DOC in the catotelm (deeper layers of peat) became more ‘autochthonous‐like’ with depth. A conceptual model is developed to summarize the hydrological processes and controls which affect DOC biogeochemistry at the Mer Bleue. Copyright © 2001 John Wiley & Sons, Ltd.

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