Percent Dry Weight (Biomass) Increases for 300, 600 and 900 ppm
Increases in the Air's CO2 Concentration:
For a more detailed description of this table, click here.
Shortgrass steppe in NE Colorado
[Bouteloua gracilis, Pascopyrum smithii, and Stipa comata]
Increases in the Air's CO2 Concentration:
For a more detailed description of this table, click here.
Shortgrass steppe in NE Colorado
[Bouteloua gracilis, Pascopyrum smithii, and Stipa comata]
|
Experimental Conditions
|
300 ppm
|
600 ppm |
900 ppm
|
|
|
Ferretti et al. (2003)
|
Representative areas of the natural ecosystem enclosed within open-top chambers, year 2000
|
55%
|
|
|
|
Ferretti et al. (2003)
|
Representative areas of the natural ecosystem enclosed within open-top chambers, year 2001
|
28%
|
|
|
|
Milchunas et al. (2005a)
|
Root biomass from a five-year open-top chamber study conducted under natural conditions at the USDA-ARS Central Plains Experimental Range in north central Colorado, USA
|
49%
|
|
|
|
Milchunas et al. (2005b)
|
Root biomass of plants exposed to natural conditions for entire growing seasons in open-top chambers
|
55%
|
|
|
|
Milchunas et al. (2005b)
|
Root biomass of plants exposed to natural conditions for entire growing seasons in open-top chambers; two years of intermediate levels of precipitation
|
53%
|
|
|
|
Milchunas et al. (2005b)
|
Root biomass of plants exposed to natural conditions for entire growing seasons in open-top chambers; very wet year
|
28%
|
|
|
|
Milchunas et al. (2005b)
|
Root biomass of plants exposed to natural conditions for entire growing seasons in open-top chambers; very dry year
|
0%
|
|
|
|
open top chambers in NE Colorado, no defoliation treatment
|
32%
|
|
|
|
|
open top chambers in NE Colorado, defoliation treatment
|
30%
|
|
|
|
|
Nelson et al. (2004)
|
Portions of the ecosystem were enclosed by large open-top chambers for five years; aboveground biomass
|
34%
|
|
|
|
Pendall et al. (2004)
|
Portions of ecosystem enclosed by open-top chambers for five years; aboveground biomass
|
28%
|
|
|
|
Pendall et al. (2004)
|
Portions of ecosystem enclosed by open-top chambers for five years; belowground biomass
|
19%
|
|
|