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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 8, issue 3
Hydrol. Earth Syst. Sci., 8, 460–484, 2004
https://doi.org/10.5194/hess-8-460-2004
© Author(s) 2004. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Special issue: Sustainability of UK upland forestry: contemporary issues...

Hydrol. Earth Syst. Sci., 8, 460–484, 2004
https://doi.org/10.5194/hess-8-460-2004
© Author(s) 2004. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  30 Jun 2004

30 Jun 2004

The hydrochemistry of plantation spruce forest catchments with brown earth soils, Vyrnwy in mid-Wales

C. Neal1, B. Reynolds2, M. Neal1, and B. Williams2 C. Neal et al.
  • 1Centre for Ecology and Hydrology, Crowmarsh Gifford, Wallingford, OX10 8BB, UK
  • 2Centre for Ecology and Hydrology Bangor, University of Wales Bangor, Deiniol Road, Bangor, Gwynedd, LL57 2UP, UK
  • Email for corresponding author: cn@ceh.ac.uk

Abstract. At Vyrnwy, in mid-Wales, a study of the hydrogeochemistry of two small spruce forested catchments, one a control and one felled midway through the study, shows a classic picture of rainfall inputs damped by the catchment and stream waters the chemistry of which varies as functions of flow and particularly of the supply of more acidic and aluminium-bearing soil water and of more basic and calcic ground waters from the zone where weathering reactions with the bedrock are high. The ground waters are most alkaline although pH may be depressed due to high dissolved carbon dioxide pressures. Nitrate concentrations increase in the first year after felling and decrease thereafter below those of the control. Water quality changes due to the dominant hydrogeochemical processes show that harvesting raises no significant water quality management issues.

Keywords: Gran alkalinity, aluminium, spruce, harvesting, forestry, nutrients, trace elements, Vyrnwy, water quality

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