300, 600 and 900 ppm Increases in the Air's CO2 Concentration:
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Native Tallgrass Prairie Dominated by Andropogon gerardii Vitman
|
300 ppm
|
600 ppm
|
900 ppm
|
|
| Number of Results |
2
|
|
|
| Arithmetic Mean |
13.5%
|
|
|
| Standard Error |
9.5%
|
|
|
|
Experimental Conditions
|
300 ppm
|
600 ppm
|
900 ppm
|
|
|
Knapp et al. (1993) |
open-top chambers, 1991
|
27%
|
|
|
|
Knapp et al. (1993) |
open-top chambers, 1992
|
0%
|
|
|