1. Age effects of annual carbon fluxes: Ongoing synthesis work
Jim Tang
Institute of Plant Biology and Conservation
Chicago Botanic Garden

2. How do GPP and R change with age?
A fundamental theory in ecological succession
Model A: modified from Odum 1967
Model B: modified from Ryan et al. 1997

3. How do GPP and R change with age?
We are not able to quantify the changes of GPP and R with age.
Therefore, most of ecosystem carbon models are not able to include age as a driving variable.

4. ChEAS sites
More clearcut and wetland sites?

5. NEE, GEP and R vs. age in ChEAS sites
data

6. NEE/GEP (CUE) and WUE vs. age in ChEAS sites

7. Global context

8. Global GPP and NPP vs. age
0.95 quantile regression
Data source: Sebastiaan et al. 2007

9. Global GPP and NPP vs. temperature

10. Global GPP and NPP vs. precipitation

11. How do GPP and R change with age?
A fundamental theory in ecological succession
Model A: modified from Odum 1967
Model B: modified from Ryan et al. 1997