Sulphate controls on dissolved organic carbon dynamics in blanket peat: Linking field and laboratory evidence

Details

Serval ID
serval:BIB_E4ED18FFA6D3
Type
Inproceedings: an article in a conference proceedings.
Collection
Publications
Title
Sulphate controls on dissolved organic carbon dynamics in blanket peat: Linking field and laboratory evidence
Title of the conference
Dynamics and Biogeochemistry of River Corridors and Wetlands
Author(s)
Chapman Pippa J., Clark Joanna M., Heathwaite A. Louise , Adamson John K., Lane Stuart N.
ISBN
978-1-901502-03-9
Publication state
Published
Issued date
2005
Editor
Heathwaite L, Webb B, Rosenberry D, Weaver D, Hayash M
Volume
294
Series
IAHS PUBLICATION
Pages
3-9
Notes
International Symposium on Dynamics and Biogeochemistry of River
Corridors and Wetlands held at the 7th Scientific Assembly of the
International-Association-of-Hydrological-Sciences, Foz do Iguaco,
BRAZIL, APR 03-09, 2005
Abstract
The dynamics of dissolved organic carbon (DOC) in blanket peat soil
solution has been monitored at an upland catchment in northern Britain
in relation to key environmental controls. Dissolved organic carbon
(DOC) displayed a strong seasonal cycle that showed a clear
relationship with soil temperature. However, in years of significant
water table drawdown (>25 cm), summer DOC concentrations were
substantially lower than in ``normal'' years, suggesting that factors
other than temperature controlled the release of DOC. Major episodic
release of sulphate (SO42-), and an associated decline in pH, was also
observed during drought periods. Controlled laboratory experiments were
conducted over a 22 week period to factor out the relationships between
water table depth, temperature and soil solution chemistry on DOC
dynamics. The results from the laboratory experiments closely followed
the patterns observed in the field data. Results suggest that changes
in soil solution chemistry (especially SO42-), in response to changes
in soil hydrology, exerted a stronger control on DOC dynamics under
drought conditions than variations in temperature alone.
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03/02/2011 14:41
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