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Peatlands and Greenhouse Gas Emissions Mark Cooper, Chris Evans, Piotr Zielinski, Tim Jones, Annette Burden, Mike Peacock, Chris Freeman, Mike Billett, Nick Ostle, Pete Levy, Kerry Dinsmore, et al.
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Talk Structure CEH Carbon Catchment Project Effects of drainage ditch blocking Effects of atmospheric deposition Acknowledging CEH, WCCL and Bangor University
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UK Soil C Auchencorth Moss Moor House Forsinard Upper Conwy CEH ‘Carbon Catchments’ Ecosystem carbon balance being measured at four peat catchments (land-atmosphere and dissolved C fluxes) Experimental components: –Drained/undrained (Forsinard) –Burnt/unburnt (Moor House) –High/low nitrogen deposition (Auchencorth) –High/low acid deposition (Conwy)
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Carbon Catchments Baseline monitoring Migneint Moor House Auchencorth Forsinard
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CARBON BALANCE CO 2 Exchange Methane Dissolved Gases Dissolved Carbon Main Peatland Carbon Fluxes
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Site Net CO 2 exchange CH 4 DICDOCPOC Net C balance Mer Bleue, Quebec 1 -40415-22 Degerö Stormyr, N. Sweden 2 -5111413-23 Glencar, SW Ireland 7,8 -55515 Auchencorth, E. Scotland 3,4 -115<115*254-70 Moor House, N. England -207102318+38 Migneint, N. Wales 51191
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Carbon Catchment: Nant Y Brwyn Upland Blanket bog which forms part of the Migneint Nant Y Brwyn is approx 1.68km 2 Mean annual rainfall is approximately 2200 mm yr –1 Mean annual temperature is 5.6°C Main vegetation consists of Calluna, Juncus, Sphagnum, Eriophorum Light grazing between May and October
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Carbon Catchment: Nant Y Brwyn Flux Tower Automated Weather Station Static Gas Chamber sampling Automated River Monitoring Complete carbon budget is still a working progress
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Methane
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Landscape Scale Aerial Photography Field Surveys High Resolution LiDAR
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Nant Y Brwyn Riparian Juncus flush covers 12% & contributes 87% of the overall CH 4 budget Contribution to Landscape CH 4 Budget
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Llyn Serw, Migneint Conwy, North Wales Habitat – wet Calluna heath on Blanket Peat – NVC M19 – Calluna, Eriophorum sp., Sphagnum sp. Historical Drainage with ditches – 1920’s & 1930’s running S-SE (mostly re-vegetated) – 1970’s & 1980’s running N-S NT blocked ditches in pilot study in 2008
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National Trust peat restoration pilot study, Llyn Serw
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CH 4 CO 2 CH 4 CO 2
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Transect of trace Gas Measurements A D CB EF A D CB EF Dip well Gas Measurement Transect Code Gas Measurements - between 11am – 3pm
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Before: After: Two years after:
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Results Summary Infilled ditches contribute a significant percentage to landscape scale methane budget despite occupying a tiny percentage of the landscape Compensating increase in CO 2 sequestration not yet quantified Vegetation in ditch is critically important for CH 4 flux Is this a transient or a long-term effect?
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Defra project to assess the impacts of peat restoration on the GHG balance Five year field experiment to evaluate the effects of peat restoration on methane emissions and the overall C and GHG balance (with Leeds and Open Universities, National Trust) Replicated study of 12 ditches, with 2 ditch-blocking treatments, pre- and post treatment measurements (CH 4, CO 2, DOC, discharge, etc)
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Many thanks marope@ceh.ac.uk I am expecting to finish my PhD 2011/2012.
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