GEST Model – vegetation proxy for GHG flux from peatlands

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Presentation by Rob Field at VNN peatland workshop, Leeds

Presentation by Rob Field at VNN peatland workshop, Leeds

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  • 1. GEST Greenhouse Emissions Site Types• The ‘emissions avoided’ model developed by John Couwenberg et al. at University of Greifswald.• Couwenberg et al., 2011, Hydrobiologia.
  • 2. Using a Proxy for GHG fluxes• Direct methods – chamber measurements – – Micro-meteorology measurements–• Indirect method – Use a proxy that indicates ghg fluxes
  • 3. Possible ProxiesThree parameters currently emerge as suitable proxies for GHGfluxes from peat soils:• Subsidence• Water level• Vegetation
  • 4. Subsidence CONS:Subisdence (cma-1) 1. hardly covertable into CO2 emission, due to shrinkage and compaction 2. not an indicator for N2O and CH4 3. only for drained situations Drainage depth (cm)
  • 5. Water table depth n = 99flooded site & lysimeter O - - collated from Augustin (2003, unpubl.), Augustin & experiments of Mundel (1976) Carbon dioxide Methane Merbach (1998), Augustin et al. •- (1996), Bortoluzzi et al. (2006), based on long term Drösler (2005), Hendriks et al. subsidence measurements (2007), Jacobs et al. (2003), Meyer (1999),den Akker et al., 2008; et (van Müller (1999), Sommer • al. (2003), Tauchnitz et al. (2008), Van den Boset al., 2009) den Pol- Verhagen (2003), Van - Van Dasselaar et al. (1999), Van representing NEP Huissteden et al. (2006), Von measurements corr. for Arnold (2004), Wild et al. (2001). harvest export (Augustin CONS: unpubl., Bortoluzzi et al. 2006, Drösler 2005, Flessa et al. 1998, Jacobs et al. 2003, Meyer 1. mapping of water level via remote sensing 1999, Müller et al. 1997, Mundel 1976, Nieveen et al. 1998, Veenendaal et al. 2007. is so far impossible 2. direct monitoring is very labour-intensive
  • 6. VegetationEmissions strongly related to water levelandVegetation can be strongly related to water level –e.g. Ellenberg moisture values
  • 7. - Species groups  presence/absence as indicator for mean water levels- Initially NE German metadata, country-specific refinement in Belarus & Ukraine peatlands site factor gradient - moisture species groups Moisture classes 1 2 3 4 5 subunits 1 2 1 2
  • 8. A simpe GEST example Re-wetting Bog -13.5t CO2-eq.·ha-1·a-1GEST moist forbs & very moist wet peatmoss meadows peatmoss lawn lawnVegetation acidophilous Sphagnum green Sphagnum Molinia-meadow Eriophorum lawn lawn (optimal)water level* -15 … -45 +10 … -20 +10 … -10CH4 1.5 0.5 5CO2 15 -2 -2GWP 16.5 -1.5 3*median of the dry and wet season relative to the surface, cm
  • 9. Rewetting open fen Future emissions avoided Year 0 Year 10 Year 20Baseline Scenario Moderately dry Moderately dry Moderately dry cultivated cultivated cultivated peatland peatland peatland 24 24 24 -8.5/-15.5 8.5/-15,5Rewetting Scenario Moderately dry Very moist reeds/ Very moist reeds/ Moderately dry cultivated peatland Very moist & sedge Very moist Wet reeds & sedge Wet reeds cultivated reeds and Wet fens and Wet reeds 24 fens peatland reed/sedge fens reeds/sedge 15.5/8.5 15.5/8.5 24 fens
  • 10. Metadata Initial values for Indicator avoided emissionsspecies/communities = Baseline - Projectwith water table depth Final value forLocal refinement avoided emissions MeasuringSpecies/communities Water depth Emissions accounting mechanisms, auditing etc