Growth Response
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Tree Growth Response

Clonal differences in aspen responses to elevated CO2 and O3 are shown in this figure of estimated volume (diameter2 x height). Isebrands et al. 2001. Environmental Pollution. 115: 359-371. Treatment_Figure.jpg
The responses of aspen to elevated CO2 and O3, alone and in combination, are shown here. Note still diverging height and diameter growth under CO2 and O3. Also note that CO2 + O3 treatments are not significantly different from controls. Percy et al. 2002. Nature. 420: 403-407.




The Northern Forest Ecosystem Experiment (NFEE) is funded by the US Forest Service.The Aspen FACE Experiment is funded principally by the U.S. Department of Energy's Office of Biological and Environmental Research. Additional support is from the USFS Global Change Program, Michigan Technological University, the Canadian Forest Service and the USFS Northern Research Station.
For more information on this project, contact Dr. Andrew J. Burton (Michigan Technological University) at (906) 487-2566 or, or Dr. Mark E. Kubiske (Northern Research Station) at (715) 362-1108 or
For questions or suggestions regarding this website, please contact Janet Pikkarainen at
Last updated: July, 2010