Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Sebastiaan Luyssaert - PowerPoint PPT Presentation

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Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Sebastiaan Luyssaert

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Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Sebastiaan Luyssaert

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  1. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Sebastiaan Luyssaert with contributions of 40+ research groups

  2. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Introduction • Forest play an important role in the global C-cycle • Since 1970 ongoing effort to estimate production and respiration • Considerable uncertainties remain • Assembled a comprehensive global database Sebastiaan Luyssaert and contributions of 40+ research groups

  3. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Objectives • Explain some important feature of the database • Identify data gaps • Present relationships GPP, NPP, NEP, Ra, Rh and Re • Present CO2-budgets per biome Sebastiaan Luyssaert and contributions of 40+ research groups

  4. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems The database • Consistent NPP data • Consistent uncertainty • Ancillary information Sebastiaan Luyssaert and contributions of 40+ research groups

  5. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems The database • Consistent NPP data • Consistent uncertainty • Ancillary information • Expert judgement accounting for : • Applied methodology • Number of observations Sebastiaan Luyssaert and contributions of 40+ research groups


  6. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems The database • Consistent NPP data • Consistent uncertainty • Ancillary information • Coordinates, elevation, climatic region, growth form, management, tree species • Observed MAT, APS, LAI, age, height, BA, diameter, density, biomass • Monthly temperature, precipitation, rainy days, cloud cover data CRU • Modelled radiation components, air humidity, N-deposition, soil composition • NDVI Sebastiaan Luyssaert and contributions of 40+ research groups

  7. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Data • 2000+ flux observations • 380 sites • 130 GPP, Re & NEP • 250 NPP • 130 Rh & Rs • 35 Ra Sebastiaan Luyssaert and contributions of 40+ research groups

  8. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Data gaps • For GPP, NPP, NEP & Re need: • - Boreal ecosystems • - Tropical ecosystems Sebastiaan Luyssaert and contributions of 40+ research groups

  9. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Data gaps • For Ra & Rh need: • - All biomes except temperate humid Sebastiaan Luyssaert and contributions of 40+ research groups

  10. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Dependence of GPP • High GPP: warm wet • Low GPP: cold dry Sebastiaan Luyssaert and contributions of 40+ research groups

  11. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Dependence of GPP Sebastiaan Luyssaert and contributions of 40+ research groups

  12. ? Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Dependence of GPP Sebastiaan Luyssaert and contributions of 40+ research groups

  13. ? Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Dependence of GPP Sebastiaan Luyssaert and contributions of 40+ research groups

  14. ? Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Dependence of GPP Sebastiaan Luyssaert and contributions of 40+ research groups

  15. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Dependence of GPP, NPP, Re and Rh • GPP ~ MAT, LAI, P • NPP ~ MAT, LAI, Rg • Re ~ MAT, LAI, P • Rh ~ MAT, ? Sebastiaan Luyssaert and contributions of 40+ research groups

  16. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Dependence of NEP • NEP ~ GPP Sebastiaan Luyssaert and contributions of 40+ research groups

  17. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Dependence of NEP • NEP ~ GPP Sebastiaan Luyssaert and contributions of 40+ research groups

  18. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Dependence of NEP • NEP ? • Age • Management sink source Sebastiaan Luyssaert and contributions of 40+ research groups

  19. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Dependence of NPP/GPP • Ra, insuf. data • NPP/GPP Sebastiaan Luyssaert and contributions of 40+ research groups

  20. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Dependence of NPP/GPP • NPP/GPP data • NPP/GPP max production Sebastiaan Luyssaert and contributions of 40+ research groups

  21. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Dependence of NPP/GPP NPP/GPP unmanaged sites Sebastiaan Luyssaert and contributions of 40+ research groups

  22. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Dependence of NPP/GPP Management > Temp Sebastiaan Luyssaert and contributions of 40+ research groups

  23. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Components of the CO2-balance • Benchmark for model validation • Closure problem Sebastiaan Luyssaert and contributions of 40+ research groups

  24. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Closure of the CO2-balance Sebastiaan Luyssaert and contributions of 40+ research groups

  25. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Global CO2-balance • Uncertainty when models follow the observations Sebastiaan Luyssaert and contributions of 40+ research groups

  26. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Conclusions • Database of field-observations available for model validation • Missing 2 out of 8 climate regions • Climate dependence of GPP, NPP, Re but not of NEP • NPP/GPP ratio is not 0.475 • Substantial closure terms indicate shortcomings of field-observations Sebastiaan Luyssaert and contributions of 40+ research groups

  27. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems We want more... • Presentation Denis Lousteau: Management effects on the annual carbon balance of forests • Poster Ilaria Inglima: NPP drives Rh in forest ecosystems • Task force presentations Martin Jung: Comparison of models and observations Sebastiaan Luyssaert and contributions of 40+ research groups

  28. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Contributors I. Inglima, M. Jung, M. Reichstein, D. Papale, S. Piao, E.-D. Schulze, L. Wingate, G. Matteucci, M. Aubinet, C. Beer, C. Bernhofer, K.G. Black, D. Bonal, J.Chambers, P. Ciais, K.J. Davis, E.H. Delucia, A.J. Dolman, A. Don, B. Gielen, J. Grace, A. Granier, A. Grelle, T. Griffis, T. Grünwald, G. Guidolotti, P.J. Hanson, R. Harding, D. Hollinger, P. Kolari, B. Kruijt, W. Kutsch, F. Lagergren, T. Laurila, B. Law, G. Le Maire, A. Lindroth, F. Magnani, M. Marek, J. Mateus, M. Migliavacca, L. Misson, L. Montagnani, J. Moncrieff, E. Moors, J.W. Munger, E. Nikinmaa, D. Loustau, G. Pita, C. Rebmann, A.D. Richardson, O. Roupsard, N. Saigusa, M.J. Sanz, G. Seufert, L. Soerensen, J. Tang, R. Valentini, T. Vesala and I. Janssens Funding Belgian Research Foundation (FWO), CarboEurope-IP and Antwerp University Sebastiaan Luyssaert and contributions of 40+ research groups