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Exploring Forest Phenology and Carbon Flux Relationships Across Different Locations

This discussion delves into NPP/GPP relationships, isotopic fluxes, and biomass trends in forests. Topics range from soil respiration and carbon uptake to the impact of diffuse vs. direct radiation on fluxes. Experts like Sebastiaan Luyssaert, Lisa Wingate, and Denis Loustau offer insights, while the movie link with the remote sensing community and methodology details further enrich the conversation.

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Exploring Forest Phenology and Carbon Flux Relationships Across Different Locations

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  1. For discussion: NPP/GPP relationships and (Sebastiaan Luyssaert) Phenology, and movie (Lisa Wingate) Link with remote sensing community (JG) Direct/diffuse story (JG) Isotopic fluxes (Denis Loustau) C flux over lifetime of forests (JG) Biomass trends (JG & Giorgio Matteucci)

  2. Reichstein et al.

  3. Methodology – TDL set up

  4. 9 0.09 0.08 8 0.07 7 0.06 6 0.05 5 Soil respiration (µmol 12CO2 m-2 s-1) Soil respiration (µmol 13CO2 m-2 s-1) 0.04 4 3 0.03 0.02 2 0.01 1 0 0 0 5 10 15 20 25 0 5 10 15 20 25 Time (days) Time (days) 13CO2 and 12CO2 fluxes

  5. 13CO2/12CO2

  6. chronosequences

  7. Effects of age and management UK Italy France Sweden Finland Magnani et al

  8. Difference between lifetime NEP and maximum NEP Magnani et al

  9. Aerosols (Haze) Fog H . . . . . . . . . . . . . . Diffuse . . . . . . Direct . . . . . . . . . . . . . . . . . . . . . . Diffuse CO2 CO2 CO2 Diffuse Terpenes/Pollen LE/H CO2 CO2 LE/H ? LE/H ? LE/H LE/H LE/H Rroot Rroot Rroot Rroot & debris Rroot & debris Rroot & debris Carbon uptake and radiation variability

  10. How forests (and phytoplankton) contribute to clouds Lovelock et al (1972) Claeys et al (2004) Kulmala et al (2004) Meir, Cox & Grace (2006) Trends in Ecology and Evolution

  11. Zhang & et (submitted) Slope steeper under diffuse Respiration greater under diffuse regime Challenge: long term trends in diffuse:direct and the consequences it has for fluxes

  12. Penetration of diffuse v direct radiation into spruce canopy (Urban et al. in press)

  13. Global & Diffuse Radiation (1965 – 2003)Eskdalemuir & Bracknell

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