Clad oct09 igrieve (nx_power_lite)

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  • 1. Peatland disturbance & DOC fluxes: Braes of Doune, a case study
  • 2. 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
  • 3. Disturbance: Pylons
  • 4. Disturbance: Roads & Drains
  • 5. Disturbance:Redistribution of peat
  • 6. Mitigation??
  • 7. GarvaldAnnett Bheithe Severie W Criche Severie E
  • 8. 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
  • 9. 0.9 0.8 0.7Absorbance (400 nm) 0.6 0.5 0.4 0.3 0.2 Disturbance no 0.1 yes 0.0 0 5 10 15 20 25 30 35 DOC mg/L
  • 10. 30 25 20DOC mg/L 15 10 5 Disturbed Control 0 0 50 100 150 200 250 300 1 Time h 0.9 0.8 0.7 0.6Stage m 0.5 0.4 0.3 0.2 Disturbed 0.1 Control 0 0 50 100 150 200 250 300 Time h
  • 11. Aqueous carbon fluxes
  • 12. 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!!