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

Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems Sebastiaan Luyssaert with contributions of 40+ research groups. Relationships between GPP, NPP, NEP, Ra, Rh and Re in forest ecosystems. Introduction. Forest play an important role in the global C-cycle

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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

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