Net Primary Productivity - Synthesis Research

The FACE data provided on this site are freely available and were furnished by individual FACE scientists who encourage their use. Please inform Rich Norby (Principal Author, ORNL FACE) of how you are using these data and of any publication plans.

Net Primary Productivity (NPP)

This study, funded primarily by the DOE's Office of Science, Biological and Environmental Research and the National Science Foundation, was performed by researchers at the Department of Energy's Oak Ridge National Laboratory and several other institutions in the United States and Europe, including Duke Forest FACE and ASPEN FACE in Wisconsin. Their work revealed that the response of forest NPP to ~550 ppm CO2 was remarkably similar across a broad range of productivity, with a stimulation at the median of 23%.

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Please note that NPP data published in 2008 supercedes these data for the ORNL FACE.


  • This research is presented in: Norby RJ, DeLucia EH, Gielen B, Calfapietra C, Giardina CP,King JS, Ledford J, McCarthy HR, Moore DJP, Ceulemans R, De Angelis P, Finzi AC, Karnosky DF, Kubiske ME, Lukac M, Pregitzer KS, Scarascia-Mugnozza GE, Schlesinger WH, Oren R. 2005. Forest response to elevated CO2 is conserved across a broad range of productivity. Proceedings of the National Academy of Sciences 102: 18052-18056.
    (Read Abstract) (Read Article in pdf format)