The bottom-up approach Soils Network active associated sites Eddy Flux network main flux sites active associated sites total coniferous

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Presentation transcript:

The bottom-up approach

Soils Network

active associated sites Eddy Flux network main flux sites active associated sites total coniferous 12 11 23 deciduous 8 3 evergreen broadleaf 4 2 6 mixed coniferous/ 1 crops 9 16 25 grassland 15 50 41 91

Zanchi et al. in press

Ciais et al., 2008

Magnani et al., 2007

Harrison et al., 2000

Kutsch, Rebmann, unpublished

Janssens, Ciais, Luyssaert and Schulze, unpublished

at canopy level GPP is very similar Janssens, Ciais, Luyssaert and Schulze, unpublished

grassland > forest Janssens, Ciais, Luyssaert and Schulze, unpublished

other GHGs balance the grassland sink increase cropland losses Janssens, Ciais, Luyssaert and Schulze, unpublished

forest biomass sink not secure Janssens, Ciais, Luyssaert and Schulze, unpublished

The top-down approach

Atmospheric network

Figure: M. Heimann

The European GHG balance

GHGs add 10% to GWP

ecosystems compensate 10% of fossil and other fluxes the N2O flux is as large as the forest sink

the entire European sink is in Eastern Europe

Conclusions The GHG balance of EU-25 is zero The Euopean GHG sink is located in eastern Europe We cannot study the carbon cycle in isolation. We have to seriously take the N-cycle on board