300, 600 and 900 ppm Increases in the Air's CO2 Concentration:
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Grassland Community [Lolium perenne L. (Perennial Ryegrass), Poa trivialis L. (Rough Bluegrass), Dactylis glomerata L. (Orchardgrass), and Phleum pratense L. (Timothy)]
|
300 ppm
|
600 ppm
|
900 ppm
|
|
| Number of Results |
2
|
|
|
| Arithmetic Mean |
25%
|
|
|
| Standard Error |
4.2%
|
|
|
|
Experimental Conditions
|
300 ppm
|
600 ppm
|
900 ppm
|
|
|
Norton et al. (1999) |
FACE, harvest 1
|
31%
|
|
|
|
Norton et al. (1999) |
FACE, harvest 2
|
19%
|
|
|