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 |
2
|
|
|
| Arithmetic Mean |
237.5%
|
|
|
| Standard Error |
19.4%
|
|
|
|
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%
|
|
|