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Calcareous groundwater raises bogs; the concept of ombrotrophy revisited

Calcareous groundwater raises bogs; the concept of ombrotrophy revisited Summary 1 Raised bogs are traditionally regarded as being solely dependent upon atmospheric influences. However, these terrestrial carbon stores may also be affected by calcareous (bicarbonate‐rich) groundwater, which is often found in deeper peat layers. 2 Field data from a bog area in the Netherlands were used to select appropriate levels of bicarbonate supply for an aquarium mesocosm experiment. The effects of 0, 0.1, 0.5, 1 and 2 mmol HCO3– l–1, and 1 mmol HCO3– l–1 + 2 mmol SO42– l–1, on the biogeochemistry of peat monoliths, including their Sphagnum vegetation, were investigated. 3 Slightly increased alkalinity rapidly stimulated buoyancy of living Sphagnum due to higher inorganic carbon concentrations in the water layer. Moderate HCO3– concentrations also stimulated buoyancy of the entire peat monoliths after 3 weeks, because of increased methane production rates. High alkalinity, however, led to rapid internal phosphate mobilization, peat disintegration and Sphagnum die‐off. This detrimental effect was stronger when sulphate was supplied simultaneously. 4 The results are discussed with respect to the carbon dynamics and overall functioning of peat bogs, in relation to hydrology and hydrochemistry (groundwater influence, sulphate pollution). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Ecology Wiley

Calcareous groundwater raises bogs; the concept of ombrotrophy revisited

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References (45)

Publisher
Wiley
Copyright
Copyright © 1999 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0022-0477
eISSN
1365-2745
DOI
10.1046/j.1365-2745.1999.00380.x
Publisher site
See Article on Publisher Site

Abstract

Summary 1 Raised bogs are traditionally regarded as being solely dependent upon atmospheric influences. However, these terrestrial carbon stores may also be affected by calcareous (bicarbonate‐rich) groundwater, which is often found in deeper peat layers. 2 Field data from a bog area in the Netherlands were used to select appropriate levels of bicarbonate supply for an aquarium mesocosm experiment. The effects of 0, 0.1, 0.5, 1 and 2 mmol HCO3– l–1, and 1 mmol HCO3– l–1 + 2 mmol SO42– l–1, on the biogeochemistry of peat monoliths, including their Sphagnum vegetation, were investigated. 3 Slightly increased alkalinity rapidly stimulated buoyancy of living Sphagnum due to higher inorganic carbon concentrations in the water layer. Moderate HCO3– concentrations also stimulated buoyancy of the entire peat monoliths after 3 weeks, because of increased methane production rates. High alkalinity, however, led to rapid internal phosphate mobilization, peat disintegration and Sphagnum die‐off. This detrimental effect was stronger when sulphate was supplied simultaneously. 4 The results are discussed with respect to the carbon dynamics and overall functioning of peat bogs, in relation to hydrology and hydrochemistry (groundwater influence, sulphate pollution).

Journal

Journal of Ecology – Wiley

Published: Aug 1, 1999

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