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Peatland disturbance & DOC fluxes: Braes of Doune, a case study
Braes of Doune Windfarm• Completed late 2006• 400 ha site, 36 x 2 MW turbines, 20 km new roads• Within River Teith Special Area of Conservation• Altitude 370-540 m• Mean annual precipitation 1600 mm• Blanket peat soils
GarvaldAnnett Bheithe Severie W Criche Severie E
Dissolved Organic Carbon, disturbed & control streams 35 30 25DOC mg/L 20 15 10 5 0 Dist. no y es no y es no y es no y es no y es no y es no y es no y es Date 15/10/2006 10/07/2007 07/09/2007 17/09/2007 09/10/2007 09/11/2007 13/02/2008 29/09/2008
Conclusions• Increased DOC in disturbed streams, but DOC losses small compared to potential C savings• Annual DOC losses of 5 g m-2 may be significant in the context of blanket peat soils as a net carbon sink.• Downstream impacts on water discoloration and light transmission, especially if coupled with elevated turbidity.• But only one study!!