Site: Cedar Creek Ecosystem Science Reserve

CDR Experiment E141 – BioCON (Biodiversity, CO2, and N) / TeRaCON (Temperature, Rainfall, CO2, and N) experiments.
Credit: Susan Barrott

In two nested global change experiments, nitrogen (N) and soil moisture jointly constrained the response of biomass production to elevated CO2 over the long term. When both water and N were limited, elevated CO2 did not affect plant biomass. When neither resource was limited, elevated CO2 caused an increase in plant biomass.