Age effects of annual carbon fluxes: Ongoing synthesis work

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

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

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.

ChEAS sites More clearcut and wetland sites?

NEE, GEP and R vs. age in ChEAS sites 2002-2003 data

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

Global context http://www.daac.ornl.gov/FLUXNET

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

Global GPP and NPP vs. temperature

Global GPP and NPP vs. precipitation

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