300, 600 and 900 ppm Increases in the Air's CO2 Concentration:
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Natural Ecosystem Composed Primarily (more than 95% of its biomass) of Yellow Birch (Betula alleghaniensis Britt.) and White Birch (Betula pendula Roth)
|
300 ppm
|
600 ppm
|
900 ppm
|
|
| Number of Results |
2
|
|
|
| Arithmetic Mean |
39%
|
|
|
| Standard Error |
12.7%
|
|
|
|
Experimental Conditions
|
300 ppm
|
600 ppm
|
900 ppm
|
|
|
Berntson and Bazzaz (1998) |
Aboveground biomass of plants that regenerated from seeds and rhizomes within chunks of soil obtained from an ecosystem and were maintained for nearly two years in plastic containers within controlled environment glasshouses
|
21%
|
|
|
|
Berntson and Bazzaz (1998) |
Belowground biomass of plants that regenerated from seeds and rhizomes within chunks of soil obtained from an ecosystem and were maintained for nearly two years in plastic containers within controlled environment glasshouses
|
57%
|
|
|