300, 600 and 900 ppm Increases in the Air's CO2 Concentration:
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Six hardwood tree species (Betula papyrifera, Populus tremuloides, Acer saccharum, Fagus grandifolia, Pinus strobus, Prunus serotina)
|
300 ppm
|
600 ppm
|
900 ppm
|
|
| Number of Results |
2
|
|
|
| Arithmetic Mean |
58%
|
|
|
| Standard Error |
4.9%
|
|
|
|
Experimental Conditions
|
300 ppm
|
600 ppm
|
900 ppm
|
|
|
Sefcik et al. (2007) |
Photosynthesis of light saturated seedlings grown for two years in open-top chambers located within a 90-year-old N-limited northern hardwood forest in northern Lower Michigan (USA)
|
65%
|
|
|
|
Sefcik et al. (2007) |
Photosynthesis of light limited seedlings grown for two years in open-top chambers located within a 90-year-old N-limited northern hardwood forest in northern Lower Michigan (USA)
|
51%
|
|
|