5. The bottom-up approach

6. Soils Network

7. 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

8. Zanchi et al. in press

9. Ciais et al., 2008

10. Magnani et al., 2007

11. Harrison et al., 2000

12. Kutsch, Rebmann,
unpublished

13. Janssens, Ciais, Luyssaert and Schulze, unpublished

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Janssens, Ciais, Luyssaert and Schulze, unpublished

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Janssens, Ciais, Luyssaert and Schulze, unpublished

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Janssens, Ciais, Luyssaert and Schulze, unpublished

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Janssens, Ciais, Luyssaert and Schulze, unpublished

18. The top-down approach

19. Atmospheric network

20. Figure: M. Heimann

23. The European GHG balance

24. GHGs add
10% to
GWP

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

26. the entire European sink is in Eastern Europe

27. 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