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Horstermeerpolder ME1-WP3

This research aims to assess the effects of changing environment and management practices on greenhouse gas fluxes in peat meadow areas using various measurement techniques. Preliminary results show the correlation between groundwater table and CH4 flux, and the need for further analysis. Collaboration with WUR, ECN, and Alterra enhances the research.

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Horstermeerpolder ME1-WP3

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  1. Horstermeerpolder ME1-WP3 • Goal of the research • The Horstermeerpolder • Overview of measurement techniques • Preliminary results • Further research & planned papers • Collaboration

  2. Research Goals This research aims to assess the effects of changing environment and management practices on the greenhouse gas fluxes from peat meadow areas. The research goals are: 1. To asses the possibility of water level manipulation as a management tool for GHG fluxes from peat meadow areas; 2. To understand the controlling mechanisms of GHG fluxes (CO2, CH4,N2O) emissions in natural fen meadows; 3. To improve the estimates of the contribution of the fen meadow areas to overall land use GHG emissions from the Netherlands.

  3. The Horstermeerpolder

  4. The Horstermeerpolder • Former agricultural land in drained natural lake • Taken out of agricultural production more than 10 years ago  semi-natural grassland • Ditch water table has been raised to 10 cm below surface • Peat meadow underlain by Pleistocene sands and overlain with organic-rich lake deposits. • Groundwater seepage

  5. Measurement techniques discharge measurements meteorology tower eddy-correlation tower fixed site flux chamber measurements planned fixed site flux- chamber measurements soil measurements hydrological measurements

  6. Other measurement techniques • Flux chamber measurements (CO2, CH4 & N2O) at fixed sites, on ditchwater and in grid setup. • Additional measurements at fixed sites for flux chamber measurements • Water quality: TOC, dissolved CH4, pH, EC, cations and anions • Water quantity: groundwater, soil water, discharge, precipitation • Vegetation analysis • Soil analysis

  7. Additional site: Ruwiel • Peat land reserve • Fen meadow • Hay pasture • High groundwater table • Never manured, mown once a year Interesting for comparisons: • Vegetation is different than at Horstermeer, while soil profiles are the same

  8. Preliminary results

  9. Energy Balance NEE and Cumulative NEE Eddy Correlation Yearly NEE = 576 gC/m2 uptake (5.76 ton/hectare) growing season 2005: 24 March to 16 October

  10. Flux Chamber measurements: Horstermeerpolder

  11. Flux data on land Flux data on water: CH4 very high * N2O measurements not significant

  12. Spatially variability over short distances • Groundwater table and CH4 flux are correlated • Temperature and CH4 flux are correlated

  13. High CH4 fluxes do not always coincide with high water levels!!

  14. CH4 flux higher along the ditches • High porosity seems to correlate with low CH4 fluxes

  15. Flux Chamber measurements: Ruwiel

  16. The Next Years… • Continuous measurements of CH4 using eddy- covariance techniques with a tunable diode fast methane analyzer (DLT-100) • Measuring concentration profiles for CO2 (and CH4) • Measuring CH4 fluxes from water surfaces • Further analysis of the relation between CH4 fluxes and water level, water quality, soil temperature, vegetation and soil parameters

  17. and… • Analysis of the relation of CH4 and CO2 • Relating the eddy-covariance measurements to land use in the Horstermeerpolder, using footprint techniques and GIS • Modeling the data and improving the PEATLAND model

  18. Collaboration with WUR, ECN and Alterra • Measurement campaigns • Discussion group • Measurement protocol • Exchange of useful data • Collaborative papers

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