300, 600 and 900 ppm Increases in the Air's CO2 Concentration:
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Tussock Tundra
|
300 ppm
|
600 ppm
|
900 ppm
|
|
| Number of Results |
3
|
3
|
3
|
| Arithmetic Mean |
158.3%
|
0%
|
0%
|
| Standard Error |
65.9%
|
0
|
0%
|
|
Experimental Conditions
|
300 ppm
|
600 ppm
|
900 ppm
|
|
|
Grulke et al. (1990) |
field, low light
|
|||
|
Grulke et al. (1990) |
field, high light
|
210%
|
||
|
Hilbert et al. (1987) |
chambers
|
265%
|