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Percent Photosynthesis (Net CO2 Exchange Rate) Increases for 300, 600 and 900 ppm
Increases in the Air's CO2 Concentration:

For a more detailed description of this table, click here.

Populus tremuloides Michx. [Quaking Aspen]

Journal References
Experimental Conditions
300 ppm

600 ppm
900 ppm
open-top chambers, low-N soil, 1995
22%
 
 
open-top chambers, low-N soil, 1996
28%
 
 
open-top chambers, high-N soil, 1995
48%
 
 
open-top chambers, high-N soil, 1996
110%
 
 
Ellsworth et al. (2004)
Plants grown under natural conditions for three years in a FACE study
37%
 
 
FACE plots, 30-m diameter
65%
 
 
Karnosky et al. (2005)
Plants grown from the young seedling stage for four years under natural environmental conditions at the Aspen FACE site near Rhinelander, Wisconsin, USA
52%
 
 
open-top chambers, early leaf-fall,
low soil nitrogen
52%
 
 
open-top chambers, early leaf-fall,
high soil nitrogen
82%
 
 
open-top chambers, late leaf-fall,
low soil nitrogen
35%
 
 
open-top chambers, late leaf-fall,
high soil nitrogen
59%
 
 
open top chamber, low nitrogen
47%
 
 
open top chamber, high nitrogen
84%
 
 
Monson et al. (2007)
Photosynthesis of trees growing for eight years at the Aspen FACE facility near Rhinelander, Wisconsin (USA) over the period 11-21 July 2006
130%
 
 
FACE, O3-tolerant clones, ambient O3
50%
 
 
FACE, O3-tolerant clones, elevated O3
74%
 
 
FACE, O3-sensitive clones, ambient O3
57%
 
 
FACE, O3-sensitive clones, elevated O3
57%
 
 
Riikonen et al. (2008)
Late-season photosynthesis (averaged over the growing season) of clone 216 trees in their 8th-9th years of CO2 enrichment at the Aspen FACE site near Rhinelander, Wisconsin (USA)
91%
 
 
Riikonen et al. (2008)
Photosynthesis (averaged over the growing season) of clone 42E trees in their 8th-9th years of CO2 enrichment at the Aspen FACE site near Rhinelander, Wisconsin (USA)
158%
 
 
Riikonen et al. (2008)
Photosynthesis (averaged over the growing season) of clone 271 trees in their 8th-9th years of CO2 enrichment at the Aspen FACE site near Rhinelander, Wisconsin (USA)
112%
 
 
Sharkey et al. (1991)
pots, low CO2 adapted
73%
 
 
Sharkey et al. (1991)
pots, high CO2 adapted
90%
 
 
FACE plots, upper canopy
39%
 
 
FACE plots, lower canopy
5%
 
 
Tjoelker et al. (1998)
Seedlings grown for three months in controlled environment chambers at day/night temperatures ranging from 18/12 to 30/24°C (average results)
19%
 
 
controlled-environment chamber, low ozone
-19%
 
 
controlled-environment chamber,
high ozone
33%