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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
Disturbance: Pylons
Disturbance: Roads & Drains
Disturbance: Redistribution of peat
Mitigation??
Severie W
Annett
Severie E
Bheithe
Garvald
Criche
DateDist.
29/09/200813/02/200809/11/200709/10/200717/09/200707/09/200710/07/200715/10/2006y esnoy esnoy esnoy esnoy esnoy esnoy esnoy esno
35
30
25
20
15
10
5
0
DO
C m
g/L
Dissolved Organic Carbon, disturbed & control streams
35302520151050
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
DOC mg/L
Abs
orba
nce
(400
nm
)
noyes
Disturbance
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0 50 100 150 200 250 300
Time h
Stag
e m
Dist ur bedCo nt r o l
0
5
10
15
20
25
30
0 50 100 150 200 250 300
Time h
DO
C m
g/L
Dist ur bedCo nt r o l
Aqueous carbon fluxes
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!!