300, 600 and 900 ppm Increases in the Air's CO2 Concentration:
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Annual Grassland Community
|
300 ppm
|
600 ppm
|
900 ppm
|
|
| Number of Results |
4
|
|
|
| Arithmetic Mean |
57.3%
|
|
|
| Standard Error |
22.4%
|
|
|
|
Experimental Conditions
|
300 ppm
|
600 ppm
|
900 ppm
|
|
|
Fredeen et al. (1995) |
open-top chambers, sandstone-derived soil, 1992
|
49%
|
|
|
|
Fredeen et al. (1995) |
open-top chambers, sandstone-derived soil, 1993
|
16%
|
|
|
|
Fredeen et al. (1995) |
open-top chambers, serpentine-derived soil, 1992
|
32%
|
|
|
|
Fredeen et al. (1995) |
open-top chambers, serpentine-derived soil, 1993
|
132%
|
|
|