15
CO2 compensation point
Aci Curve
Aber et al. 1996
Ollinger et al.. 2002
Lambers et al. 1998
Chapin et al. 1987
CO2 CO2
O2
GPP
R leaf
R non-leaf
Net Ps
NPP
LiveBiomass
Litter ProductionSoilOrganicMatter
R decomposerR herbivory
Total Ecosystem Carbon
R autotroph
NPP = GPP – R autotroph = R herbivory + Litter Production + Change in Live Biomass
True Increment
NEP = GPP - R autotroph - R herbivory - R decomposer
R total
R heterotrophNPP
Melillo et al. 1993
63 Pg C/yr
Melillo et al. 1993
53.3 Pg C/yr
NPP = FPAR * PAR * E
Potter et al. 199348 Pg C/yr
