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Title: The effect of soil hydrology, pedology and land use on manganese mobilisation in upland catchments
Author: Hardie, Alasdair Macdonald
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2002
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Instrumentation to monitor soil water chemistry and soil hydrology was installed within a sub-catchment of Loch Bradan water supply reservoir in SW Scotland. Following the dry summer of 1995, raw water samples from this reservoir contained Mn concentrations far greater than the EC standard. This increase in reservoir water Mn concentration is believed to have resulted from processes associated with the rewetting of exceptionally dry catchment soils. For this study, six field sites were chosen to allow comparison of the effect that major soil types (peat, peaty gley, peaty podzol) and land uses (Sitka spruce plantation, moorland) within the catchment had on Mn mobilisation upon rewetting following a dry period. Soil water and stream water samples were collected over an 18-month period from April 1999 to October 2000. Additional data were also collected concerning Mn concentration in soil, stream sediment, precipitation and vegetation samples in order to characterise potential Mn sources within the catchment. Results from the field monitoring programme indicate that land use did not influence soil water Mn concentrations and that there was no seasonal peak in soil water Mn concentration from any of the instrumented soil horizons. However, the absence of extended drying conditions during the monitoring period may explain this lack of anticipated seasonal Mn mobilisation, as it is possible that soils did not dry out to the extent where Mn mobilisation would occur. Laboratory experiments were undertaken to examine the potential of catchment soils to release Mn following prolonged drying conditions not encountered during the field monitoring programme. Soil cores were collected from the same major soil horizons and land uses that were instrumented during the field monitoring programme and allowed to dry under controlled conditions before rewetting. Soil water chemistry data from these experiments indicates that Mn mobilisation occurred within specific horizons, containing both mineral and organic matter, rather than from all soil horizons.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available